8.2 grams of calcium nitrate is decomposed by heating according to the equation

2Ca(NO₃)₂ ⟶ 2CaO + 4NO₂ + O₂

Calculate the following:

(a) Volume of nitrogen dioxide obtained at STP

(b) Mass of CaO formed

[Atomic weights: Ca –40 , N—14, O—16]

State giving reasons if:

(a) zinc and aluminium can be distinguished by heating the metal powder with concentrated sodium hydroxide solution.

(b) calcium nitrate and lead nitrate can be distinguished by adding ammonium hydroxide solution to the salt solution.

Give balanced equations for the following:

(a) Laboratory preparation of ethyne from calcium carbide.

(b) Conversion of acetic acid to ethyl acetate.

(c) Laboratory preparation of nitric acid.

Identify the following substances:

(a) An alkaline gas which produces dense white fumes when reacted with HCl gas.

(b) The anion present in the salt, which produces a gas with the smell of rotten eggs when reacted with dil. HCl.

(c) The particles present in strong electrolytes.