Can u plzzz answer question no. 13, 23 & 25
Although these are not from 11th std

Can u plzzz answer question no. 13, 23 & 25 Although these are not from 11th std CHEMISTRY 1. Alto, + 2Fe The above reaction is an example Of a l) combination reaction •Ydecomposition reaction VERSION-II CBSE-ICSE double displacement reaction displacement reaction 3. 4. 7. 8. When the gases sulphur dioxide and hydrogen sulphide mix in the presence of water, the reaction is SO: + 2H2S -+ 2H20 + 3S. Here hydrogen sulphide is acting as an oxidising agent a reducing agent 3) a dehydrating agent 4) a catalyst A balance chemical equation is in accordance with 1 ) avogadro's law 2) law of multiple praportions law of conservation of mass 4) law of gaseous volumes Hydrogen sulphide (H.S) is a strong reducing agent. Which of the following reactions shows its reducing action 1) CdS 2HNOA 3) + US + 2HC1+S 2)ÄCGsoa uS CuS • E-LSO, 4) 2CH;COOH 10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HCL If we take 20 ml. of the same solution of NaOH, the amount of IICI solution (the same solution as before) required to neutralise it will be 1) 4 mL 3) 12 mL v41¯- 16 mL A blue limus paper was first dipped in dil. IICI and then in dil. NaOH solution. It was observed that the colour of the litmus paper 1) changed to red 3) changed blue to colourless 2NaOH + Mg SO. ? 1) Mgo Na,so, 3) Nap Plaster of paris is obtained changed first to red and then to blue 4) remains blue in both the solutions Na,so, •:'9 4) MgO.Na,O 1) by adding water to calcium sulphate 2) by adding sulphuric acid to calcium hydroxide ' by heating gypsum to a very high temperature 4) by heating gypsum to 373 K 9. Which of the following is the weakest base NaOH 4) KOH 3) NH.OH 10. Removal of impurities from ore is known as •-—ZT¯ concentration of ore I) crushing and grinding 4) roasting 3) calcination 11. Two elements X and Y have following electrons configuration Y: z euo-iru The expected compound formed by combination of X and Y will be expressed as 2) xyz XY2 4) xys 12. Heating of concentrated ore in absence of air for conversion into oxide ore is known as I ) roasting 3) reduction 08/04/2018 2) calcination none of these Page. 1 Entrance Test