Question

Q.1- Fill in the blanks with appropriate words:

a. An example of an acid having basicity 3 is ……….

b. A volatile acid obtained from nitre is ……..

c. To distinguish soluble salts of copper and lead, ……… can be used.

d. The hydroxide (other the Zinc) which is soluble in excess of NH4OH is ……..

e. The formula of an acid which is used as ink stain remover is ………..


Q.2- Complete and balance the following equations:


a. FeSO4+ NaOH ………..+ ………

b. CuSO4 + NH4OH  ……. + ………

c. FeCl3 + NaOH  ………. + ………

d. Zn(OH)2 + (NH4)2SO4 + NH4OHExcess ………. + ………

e. Pb(OH)2 + NaOHExcess  ………. + ………..


Q.3- Name the following:


i. A basic solution which does not contain a metallic element.

ii. A normal salt of sodium formed from acetic acid.

iii. A base which reacts with an acid to give a salt which on hydrolysis gives a slightly acidic solution.

iv. An ion which combines with a polar covalent molecule to form an ammonium ion.

v. A soluble salt formed by direct combination between a light metal and a greenish yellow gas.


Q.4- Give reasons for the following:


i. Concentrated sulphuric acid is a weaker acid compared to dilute sulphuric acid.

ii. An aqueous solution of the salt ammonium chloride is acidic in nature while an aqueous solution of sodium chloride is neutral.

iii. In the preparation of an insoluble salt from another insoluble salt by precipitation (double decomposition), dilute nitric acid and not dilute sulphuric acid is generally used.

iv. Acetic acid does not form an acid salt but forms a normal salt.

v. Sulphurous acid forms two types of salts on reaction with an alkali.

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Answer 1

Explanation:

a)ba(OH)3 barium hydroxide