Q46 of 48 Page 16

A dry pellet of a common base B, when kept in open absorbs moisture and turns sticky. The compound is also a by-product of chloralkali process. Identify B. What type of reaction occurs when B is treated with an acidic oxide? Write a balanced chemical equation for one such solution.

Base B is sodium hydroxide (NaOH). Dry pellets of sodium hydroxide (NaOH) absorb moisture from the atmosphere and becomes sticky. It is also a by-product of chloralkali process. The acidic oxide such as CO2 reacts with a base such as NaOH to give salt (sodium carbonate) and water. Such reaction is called neutralisation reaction.



Thus, ‘B’ is NaOH and reaction between ‘B’ and acidic oxide is called a neutralization reaction.


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44

For making cake, baking powder is taken. If at your home mother uses baking soda instead of baking powder in cake.

(a) How will it affect the taste of the cake and why?


(b) How can baking soda be converted into baking powder?


(c) What is the role of tartaric acid added to baking soda?

 45

A metal carbonate X on reacting with an acid gives a gas which when passed through a solution Y gives the carbonate back. On the other hand, a gas G that is obtained at anode during electrolysis of brine is passed on dry Y, it gives a compound Z, used for disinfecting drinking water. Identify X, Y, G , and Z.

 47

A sulphate salt of group 2 element of the periodic table is a white, soft substance, which can be moulded into different shapes by making its dough. When this compound left is open for some time, it becomes a solid mass and cannot be used for moulding purposes. Identify the sulphate salt and why does it show such a behaviour?

 48

Identify the compound X on the basis of the reactions given below. Also write the name and chemical formulae of A, B and C.

X + Zn ⇨ A + H2


X + HCl ⇨ B + H2O


X + CH3COOH ⇨ C + H2O