Q38 of 48 Page 15

Salt A commonly used in bakery products on heating gets converted into another salt B which itself is used for removal of hardness of water and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify A, B and C.

Salt A is sodium bicarbonate (NaHCO3) as it is commonly used in bakery products and on heating produces Na2CO3. Salt B is sodium carbonate Na2CO3 as it is used for removal of hardness of water. Gas C is carbon dioxide (CO2 ) as it turns lime water milky.


This can be shown as a chemical equation:



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In one of the industrial process for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in chemical industry. Identify X and Y giving the chemical equation of the reaction involved.

 40

Fill in the missing data in the given table.























































Name of the salt



Formula



Salt obtained from



Base



Acid



(i)



Ammonium chloride



NH4Cl



NH4OH



-



(ii)



Copper sulphate



-



-



H2SO4



(iii)



Sodium chloride



NaCl



NaOH



-



(iv)



Magnesium nitrate



Mg(NO3)2



-



HNO3



(v)



Potassium sulphate



K2SO4



-



-



(vi)



Calcuim nitrate



Ca(NO3)2



Ca(OH)2



-