Equilibrium, Popular Questions: ICSE Class 11-science CHEMISTRY, Chemistry Part I

Narayani Upadhyaya & 1 other asked a question

Subject: Chemistry, asked on on 5/12/13

explain why cp is always greater than cv????

Chris & 1 other asked a question

Subject: Chemistry, asked on on 16/2/16

What is basic principle behind the systematic analysis of cations and group separation? Explain.

Neeraj Rana Miral asked a question

Subject: Chemistry, asked on on 27/2/13

why oxygen is paramagnetic in nature by molecular orbital theory

Chowdhury Md. Masood asked a question

Subject: Chemistry, asked on on 10/10/15

For the reaction equilibrium, 2 NOBr(g)2 NO(g) + Br₂(g) . If P_Br2= P/9 at equilibrium and P is total pressure, the ratio of Kp/P is equal to (The ones marked in blue, those steps I couldn't understand , please explain it )

Pankaj Kumar asked a question

Subject: Chemistry, asked on on 2/11/12

what is physical equilibrium? Give two example

Mahima asked a question

Subject: Chemistry, asked on on 15/9/19

Two system pcl5

Ankita asked a question

Subject: Chemistry, asked on on 19/3/14

Equal volumes of two solutions pH=2 and pH=4 are mixed together.Calculate the pH of the resulting solution?

Amol Paunikar asked a question

Subject: Chemistry, asked on on 29/5/18

amongst BMe3, BF3, Bcl3 and B2H6 which one will be the best Lewis acid

Rupesh Kumar asked a question

Subject: Chemistry, asked on on 4/4/15

how to arrange on the basis of bond angle

NO3- , NO2- NO2. and NO2+

Vaibhav Gupta asked a question

Subject: Chemistry, asked on on 14/11/12

Is SnCl₄ a Lewis acid or a base???

Arrange the following Bronsted Acids in increasing acidic strength,Give Reason for your choice :

1)HCl,HBr ,HI,CH₃COOH,HCO₃,H₂O

2)HCOOH,C₆H₅COOH,CH₃COOH

Janani & 2 others asked a question

Subject: Chemistry, asked on on 8/12/16

3.2 moles of HI(g) were heated in a sealed bulb at 444°C till the equilibrium was reached. It's degree of dissociation was found to be 20%. calculate the number of moles of hydrogen iodide, hydrogen and iodine present at the equilibrium point and determine the value of equilibrium constant for the reaction 2HI(g) H2(g)+I2(g). Considering the volume of the container 1L.
plz answer me soon and explain

Maharshi Chakraborty asked a question

Subject: Chemistry, asked on on 31/10/12

What is an evacuated vessel? [From Comprehensive Chemistry Pg.-370]

Aditya Pachauri asked a question

Subject: Chemistry, asked on on 28/11/13

the value of Kc = 4.24 at 800K for the reaction

CO(g) + H2O(g) CO2(g) + H2(g)

Calculate the equilibrium concentration of CO2 ,H2O ,CO , H2 at 800K ,if only CO and H2O are pesent initially at concentration of 0.10M each.

Madhu Patel asked a question

Subject: Chemistry, asked on on 27/2/17

What is meant by solubility product constant .give relationship between solubility product and solubility of binary salt

Kashif Yusuf asked a question

Subject: Chemistry, asked on on 28/8/14

100 ml of 0.1 N NaOH is mixed with 100 ml of 0.1 N H₂SO₄.The pH of the resultant solution is??

Hermione Granger asked a question

Subject: Chemistry, asked on on 6/2/13

why are standard solutions always prepared in volumetric flask?

Kashif Yusuf asked a question

Subject: Chemistry, asked on on 28/7/14

In a closed system:A_(s)⇌2B_(g)+3C_(g) if the partial pressure of C is doubled then partial pressure of B will be??

Shalini Devanand asked a question

Subject: Chemistry, asked on on 25/12/18

Pls sns this fast

Shahid asked a question

Subject: Chemistry, asked on on 18/10/14

two moles of NH3 gas are introduced into a previously evacuated one litre vessel in which it partially dissociate at high temperature as 2NH3-N2+3H2.at equilibrium one mole of NH3 Remain.the value of Kc is??

Armaan Siddiqui asked a question

Subject: Chemistry, asked on on 8/12/19

How many moles of sodium bicarbonate are needed to neutralize 0.8ml of sulphuric acid at Stp

Shreya asked a question

Subject: Chemistry, asked on on 19/12/14

1 c.c of 0.1N HCL is added to 1L solution of NACL. the pH of resulting solutionwill be??

Aswathi Aerath Vinayachandran asked a question

Subject: Chemistry, asked on on 9/5/13

The solubility of salts of weak acids increases at lower pH. Can you explain the derivation in textbook?

Nitin Gupta asked a question

Subject: Chemistry, asked on on 5/12/10

What is the pH of 10^-8 M HCl solution?

Harsha S asked a question

Subject: Chemistry, asked on on 17/1/15

(i)what happens to the blood red colour when oxalic acid is added to the equilibrium reaction Fe⁺³ + SCN^- -----> [Fe(SCN)]⁺² ?
(ii) what happens to the intensity of blood red colour if Hg is added to the above reaction ?

Nikhil Chaudhari asked a question

Subject: Chemistry, asked on on 22/12/11

At 90'C, pure water has [H30⁺]=10^-6mole/liter. the value of k_W at 90'C is:

10^-6
10^-8
10^-12
10^-14

Sarah Butaney asked a question

Subject: Chemistry, asked on on 20/8/18

In the reaction Al + Fe3O4 gives Al2O3 + Fe; what is the total no. of electrons transferred in balanced equation

Chowdhury Md. Masood asked a question

Subject: Chemistry, asked on on 10/10/15

At temperature T K, PCl₅is 50% dissociated at an equilibrium pressure of 4 atm. At what pressure it would dissociate to the extent of 80% at the same temperature:-

a) 0.05 atm
b) 0.60 atm
c) 0.75 atm
d) 2.50 atm
Kindly answer sir/mam.

Mahek Harwani asked a question

Subject: Chemistry, asked on on 12/2/19

calculate the ph of 0.01 M Al(OH)3 solution

Prashant K Moroliya asked a question

Subject: Chemistry, asked on on 10/12/11

Question - The pH of 0.1 M monobasic acid is 4.50. Calculate the concentration of H+, A- and HA. Also determine the values of ka and pka of mono basic acid.

Meethi asked a question

Subject: Chemistry, asked on on 16/11/15

What's the n factor of NH4OH and NH4Cl?

Chowdhury Md. Masood asked a question

Subject: Chemistry, asked on on 24/12/15

The equilibrium A(g) + 4B(g) <--------> AB_⁴(g) is attained by mixing equal moles of A and B in a one litre vessel. Then at equilibrium:- (Kindly explain the answer also)

a) [A] = [B]
b) [A] > [B]
c) [A] < [B]
d) [AB₄] > [A]

Kindly answer sir/mam.

Reena asked a question

Subject: Chemistry, asked on on 4/3/17

Please tell the step to find Ln(2?10^13).

Kashif Yusuf asked a question

Subject: Chemistry, asked on on 4/8/14

The pH of a solution obtained by mixing 100 ml of 0.2 M CH₃COOH with 100 ml of 0.2 M NaOH will be??(given pK_a for CH₃COOH =4.74 and log 2=0.301)

Hermione Granger asked a question

Subject: Chemistry, asked on on 6/2/13

what is the formula and basicity of hydrated oxalic acid and anhydrous oxalic acid?

Aneeqa Labeeb asked a question

Subject: Chemistry, asked on on 4/1/17

For which of the following reaction, the degree of dissociation (α) and equilibrium constant (K_p) are related as

K_{p} = \frac{4 α^{2} P}{(1 - α^{2})}

?
(1)

N_{2} O_{4} (g) ⇌ 2 {NO}_{2} (g)

(2)

H_{2} (g) + I_{2} (g) ⇌ 2 HI (g)

(3)

N_{2} (g) + 3 H_{2} (g) ⇌ 2 {NH}_{3} (g)

(4)

{PCl}_{3} (g) + {Cl}_{2} (g) ⇌ {PCl}_{5} (g)

Esha Srivastava asked a question

Subject: Chemistry, asked on on 4/2/17

66) W h a t i s t h e p H o f a 0.10 M C_{6} H_{5} O^{-} s o l u t i o n ? T h e K_{a} o f C_{6} H_{5} O H i s 1.0 \times 10^{- 10} . (a) 10.51 (b) 11.04 (c) 11.50 (d) 12

Kashif Yusuf asked a question

Subject: Chemistry, asked on on 17/8/14

K_sp of Mg(OH)₂is 4.0×10^-12.The number of moles of Mg²⁺ ions in one litre of its saturated solution in 0.1 M NaOH is??

Hermione Granger asked a question

Subject: Chemistry, asked on on 6/2/13

what type of substance is used for preparing standard solution?

Vidushi Kaushik asked a question

Subject: Chemistry, asked on on 31/12/15

Given that the equilibrium constant for the reaction
2SO2 + O2 ------> 2SO3
has a value of 278 at a particular temperature. What is the value of the equilibrium constant for the reaction at the same temperature
SO3 -----> SO2+ ½O2

Devendra Patil asked a question

Subject: Chemistry, asked on on 1/1/12

Q] One mole of N₂O₄(g) at 300K is kept in a closed container under one atmosphere. It is heated to 600K when 20% by mass of N₂O₄(g) decomposes to NO₂(g). The resultant pressure is??

Anmol asked a question

Subject: Chemistry, asked on on 1/11/16

Electronegativity difference is directly proportional to acidic strength. But ionic bonds are stronger than covalent bonds, making it harder for compounds having high electronegativity difference to donate proton. Then how is this possible ? Explain in detail.

Chowdhury Md. Masood asked a question

Subject: Chemistry, asked on on 10/10/15

For the equilibrium,

If the value of Kc is 3, the percentage by mass of iso-butanein the equilibriummixture would be:-

a) 75%
b) 90%
c) 30%
d) 60%
Kindly answer sir/mam.

Dhanshree asked a question

Subject: Chemistry, asked on on 19/2/18

Calculate the percentage hydrolysis and the pH of 0.02 M CH₃COONH₄ : K_b(NH₃) = 1.6 × 10^–5, K_a(CH₃COOH) = 1.6 × 10^–5.

Rahul asked a question

Subject: Chemistry, asked on on 24/1/16

4 moles of PCl5 dissociate at 760 k in a 2 litre flask at equilibrium .0.8 mole of Cl2 was present in the flask . The equilibrium constant would be.?

Abhishek.s.nair asked a question

Subject: Chemistry, asked on on 25/1/19

Hydrolysis of sucrose gives : sucrose + h2o ===> glucose + fructose. if equilibrium constant Kc = 2 x 10^13 at 300K; calculate ?G?
Experts; I did the answer as shown in the picture. I have rounded off at last to simplify the calculations. Please check if my answer which is rounded off is correct or not? I think it is correct. Pls check.

Preeti & 1 other asked a question

Subject: Chemistry, asked on on 7/3/17

The ionization constant of a base (C2H5)3N is 6.4*10^-5. calculate its degree of dissociation in its 0.1 M solution when mixed with 0.01M NaOH solution.

Rikhish Khumanthem asked a question

Subject: Chemistry, asked on on 1/5/19

What is the molarity of 1N H2SO4 solution?

Namita Kulkarni asked a question

Subject: Chemistry, asked on on 9/3/15

At a certain temperature 2HI gives H2and I2(reversible reaction) .Only 50% HI is dissociated at equilibrium .The equilibrium constant is .

Sonal Chaudhary asked a question

Subject: Chemistry, asked on on 16/3/13

the dissociation of H₂S is suppresed by the presence of HCl explain why

. asked a question

Subject: Chemistry, asked on on 13/10/14

calculate simultaneous solubility of AgCNS and AgBr in a solution of water.Ksp AgCNS=1.2*10^-12,Ksp AgBr=5*10^-13

Udit Rana asked a question

Subject: Chemistry, asked on on 17/11/15

What is function of dil.HCl in group 2 analysis?

Devanshi D Dash asked a question

Subject: Chemistry, asked on on 4/4/13

49) Which oxychloride has maximum pH?

a) NaClO b) NaClO₂ c) NaClO₃ d) NaClO₄

88) A infinite dilution the percentage ionisation for both the strong and weak electrolyes is:

a) 1% b)20% c)50% d) 100%

Disharee Sen asked a question

Subject: Chemistry, asked on on 6/10/18

A mixture of 0.1 mole of NO,0.05 mole of H2 and 0.1 mole of H2O is placed in one litre vessel to attain the equilibrium, 2NO+2H2=N2+2H2O . At equilibrium [NO]=0.062M. Calculate )a the equilibrium of concentration of each gas and b)Kc for the change

Mamuni Padhy asked a question

Subject: Chemistry, asked on on 14/9/14

the value of delta G for the phosphorylation of glucose in glycolysis is 13.8 kj/mol. Find the value of Kc at 298K?

Janaki asked a question

Subject: Chemistry, asked on on 29/1/19

what are the conjugate acids of CH3OH and CH3O-. are they strong acids? why?

Ht Dube asked a question

Subject: Chemistry, asked on on 29/6/10

The solubility product constant of Ag₂CrO₄ and AgBr are 1.1 × 10^–12 and 5.0 × 10^–13 respectively. Calculate the ratio of the molarities of their saturated solutions.

Mike asked a question

Subject: Chemistry, asked on on 18/3/17

a N2 and H2 mixture initially in a molar ratio 1:3 reached equilibrium to form NH3 when 25% of N2 and H2 reacted. If total pressure of system was 21atm. The partial pressure of NH3 at equilibrium is a N2 and H2 mixture initially in a molar ratio 1:3 reached equilibrium to form NH3 when 25% of N2 and H2 reacted. If total pressure of system was 21atm. The partial pressure of NH3 at equilibrium is

Rajnin Nanda asked a question

Subject: Chemistry, asked on on 4/4/16

In the equilibrium mixture CaCO3(s) -----> CaO (s) + CO2 (g) at 27 °C is 2 atm. What will be the pressure of CO2 when 2 moles of CO2 are added to equilibrium mixture. (Ans is 2 atm please explain how?)

Pluto Wilson asked a question

Subject: Chemistry, asked on on 20/10/15

the value of the equilibrium constant for the reaction

H2(g)+I2(g)2HI(g)

at 720K is 48. What is the value of the equilibrium constant for the reaction

1/2H2(g)+1/2I2(g)HI(g)

Meethi asked a question

Subject: Chemistry, asked on on 27/10/15

For the equilibrium SO3 (g) = SO2 (g) + 1/2 O2 (g), the molar mass at equilibrium was observed to be 60, then the degree of dissociation of SO3 would be? Answer is 0.66

Nikhil Chaudhari asked a question

Subject: Chemistry, asked on on 1/12/11

At temperature T, a compound AB₂ (g) diassociates according to the reaction :

2AB₂(g) [reverisble sign ] 2AB(g) + B₂.

with degree of dissociation, x, which is small compared to unity. Deduce the expression for x in terms of equillibrium constant K_p and the total pressure.

Hermione Granger asked a question

Subject: Chemistry, asked on on 6/2/13

can solid NaOH be used to prepare its standard solution?

Soumita Kundu asked a question

Subject: Chemistry, asked on on 5/4/14

The equilibrium constants K_P1 and K_P2 for the reactions X↔2Y and Z↔P +Q, respectively are in the ratio of 1 : 9. If the degree of dissociation of X and Z be equal then the ratio of total pressure at these equilibria is

Abdurrahim Zain asked a question

Subject: Chemistry, asked on on 22/2/13

how to find the negative antilog... e.g: antilog(-6.8)
'' '' log(0.003)=? > How to find?
and Log(0.3)=?

Omais . asked a question

Subject: Chemistry, asked on on 16/1/17

Calculate the degree of ionisation and ph of 0.05 M solution of a weak base having the ionization constant (Kb) is1.77 ? 10 raised to power -5 .Also calculate the ionisation constant of the conjugate acid of this base

Ratna Manjula asked a question

Subject: Chemistry, asked on on 7/11/13

How CH3COONa is a strong electrolyte?

Divya Chaudhary asked a question

Subject: Chemistry, asked on on 10/9/16

In the equilibrium SO2Cl2 is equilibrium with SO2 +Cl2 at 2000 K and 10atm pressure . %Cl2=%SO2= 40(by volume). Then Kp=8. How?

Aayushi Gupta asked a question

Subject: Chemistry, asked on on 14/10/12

0.1 mol of PCl5 is vaporised in a litre vessel at 260 C. Calculate the concentration of Cl2 at equilibrium. If the equilibrium constant for the dissosciation of PCl5 is 0.0414

Subhashree Panda & 1 other asked a question

Subject: Chemistry, asked on on 26/12/15

46) A sample of Na2CO3.H2O weighing 0.62g is added to 100ml of 0.1N H2SO4 solution. What will be the resulting solution

a) Acidic b) NEUTRAL c) BASIC

Meethi asked a question

Subject: Chemistry, asked on on 29/10/15

When NaNO3 (s) is heated in closed vessel, oxygen is liberated and NaNO2 (s) is left behind. At equilibrium? Among options one is addition of NaNO3 (s) favors forward direction but this option isn't given correct. Correct option is increasing pressure favours reverse direction. Pls explain why isn't that option correct.

Rd asked a question

Subject: Chemistry, asked on on 6/3/15

Consider the following endothermic reaction: CH4(g) + H2O(g) > CO(g) + 3H2(g) at equilibrium. How will the equilibrium be affected by increasing temperature and pressure?

Kashif Yusuf asked a question

Subject: Chemistry, asked on on 20/8/14

When 0.1 mole of ammonia is dissolved in sufficient water to make 1 litre of solution.The solution is found to have a hydroxide ion concentration of 1.34×10^-3.The dissociaton constant of ammonia is??

Aayushi Rohilla asked a question

Subject: Chemistry, asked on on 25/11/18

explain the ans

. asked a question

Subject: Chemistry, asked on on 13/10/14

Ksp(BaSO4)= 1.5*10-9. find solubility in a)pure water b)0.1 M BaCl2 solution

Pranav Manoj asked a question

Subject: Chemistry, asked on on 24/11/19

What is the full form of Q_c and K_cin equilibrium ?

Varshini & 1 other asked a question

Subject: Chemistry, asked on on 21/8/15

In an equilibrium A + B C + D; A and B are mixed in a vessel at temperature T. Theinitial concentration of A was twice the initial concentration of B. After the equilibrium has

reached, concentration of C was thrice the equilibrium concentration of B. Calculate KC.

Hermione Granger asked a question

Subject: Chemistry, asked on on 6/2/13

rn

Why do we take equimolar quantities of reacting compounds in the preparation of double salts?

rn

Aakash Kumar asked a question

Subject: Chemistry, asked on on 31/10/13

1)- What is the pH of10^-8 (N) HCl?

Neha Ragesh Nambiar asked a question

Subject: Chemistry, asked on on 30/11/17

A certain ideal gas has C_v.m = a + bT, where a = 25.0 J/(mol. K) and b = 0.03 J (mol. K²). Let 2 mole of the gas go from 300 K and 2.0 litre volume to 600 K and 4.0 litre. ΔS_gas is
(1) 32.08 J/K (2) –12.08 J/K (3) 64.17 J/K (4) None of these

Priyankaparthan asked a question

Subject: Chemistry, asked on on 26/12/16

The ratio of Kp/Kc for reaction
CO (g) + 1/2 O2 equlibrium equal is Co2 (g) is

Manan Vyas asked a question

Subject: Chemistry, asked on on 11/8/19

3 moles of PCl5 are placed in 100 litre vessel the equilibrium pressure is 2.05 ATM and temperature is 500K find kp

munmunbhatele... asked a question

Subject: Chemistry, asked on on 26/11/13

an excess of agno3 is added to 100 ml of a 0.01 M solution of [cr(h2o)4cl2]cl.the number of agcl precipated would be:

is this question based on common ion effect

Shivani asked a question

Subject: Chemistry, asked on on 4/11/12

why is trhe change in ph with temperature often ignored while the equilibrium constant is directly propotional to temperature????? pls ans soon

Yuvraj asked a question

Subject: Chemistry, asked on on 12/5/16

What is the active mass of 5g CaO?

Hermione Granger asked a question

Subject: Chemistry, asked on on 8/2/13

What is meant by "weighing by transfer"?when is this used?answer with respect to basic laboratory techniques.

Pearl asked a question

Subject: Chemistry, asked on on 4/2/16

for the reaction: NH2COONH4 ---> 2NH3 + CO2/
the equilibrium constant kp= 2.9*10^ -5 atm^3. the total pressure of gases at equilibrium when 1.0 mole of reactant was heated will be

Ankush Raj asked a question

Subject: Chemistry, asked on on 25/6/13

Kc for the esterification reaction CH3COOH + C2H5OH ------> CH3COOC2H5 + H2O is 4. If 4 mole each of acid and alcohol are initially, What is the equilibrium concentration of the acid.

. asked a question

Subject: Chemistry, asked on on 11/2/15

How much water must be added to 300 ml of 0.2 M solution of acetic acid for the degree of dissociation of the acid to double Ka=1.8*10 raised -5