Subject Experts Solutions for Chapter: Language of Chemistry and Transformation of Substances, Exercise 2: PRACTICE QUESTIONS (COMPETITION WING)

A compound X of silver on treatment with barium chloride gives the respective products Y and Z. X on treatment with sodium hydroxide gives A and B where A can also be obtained when silver is attacked by ozone and B is the salt of an oxyacid of nitrogen which ends with the suffix "ate. Identify and give the chemical formulae of the substances X, Y, Z, A and B.

The salt of hypohalous acid is prepared from the respective components, namely, halogen and the corresponding metallic hydroxide. The metal is the one which possesses the number of electrons in the ratio of $1:4:4:1$ which corresponds to, namely, K, L, M and N shells, respectively, and the halogen is a greenish-yellow colour gas which can displace bromine from magnesium bromide. Identify the salt and the respective components. 

The molecular masses of sulphate and hydroxide of a metal $\mathrm{M}$ are $142$ and $40$, respectively. Calculate atomic mass and valency of the metal.

Identify, A, B, C, types of reactions and oxidizing, reducing agents in the following processes.

(A) A mixture of ferric oxide and carbon is strongly heated to form a solid A and gas B.

(B) Gas B is passed on red-hot carbon to form gas C.

(C) Gas B can be prepared by the combustion of non-metal.

What are the changes observed when moist sugar is treated with anhydrous calcium chloride and concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$, respectively?

Identify the type of chemical change that silver chloride undergoes in photogrey lenses.

Blue-coloured gas X having a characteristic fishy odour, can restore the colour of lead paintings. This gas can also be used for sterilising water. Identify the gas X. Mention the type of reaction(s) involved.

Fluorine is very reactive and attacks all metals but still a copper vessel is used in the preparation of fluorine gas. Why?