Manganese (iv) oxide, lead (iv) oxide and red lead `(Pb_3O_4)` react with conc. HCI liberating chlorine.
What is the common property being shown by these metal oxides?

Manganese (iv) oxide, lead (iv) oxide and red lead (Pb_3O_4) react with conc. HCI liberating chlorine. Write the equation for the reaction of conc. HCI with Pb_3O_4 .

What is the common property of the oxides CO,NO and N_(2)O ?

A 0.1 mole of a metal is burnt in air to form oxide. The same oxide is then reduced by 0.05 M, 4 litres S_(2)O_(3)^(2-) (acidic medium) to +3 oxidation state of metal. What is the oxidation state of metal in oxide ?

Name an oxide that liberates chlorine with HCI and oxygen with conc. H_(2)SO_(4) .

Select from the given below (A to F), the one substance in each case which matches the descriptions given in parts (i) to (vi). Copy and complete the given grid with your answers as shown for part (i). (A) Ammonia (B) Copper oxide (C) Copper sulphate (D) Hydrogen chloride (E) Hydrogen sulphide (F) Lead bromide (i) Although this compound is not a metal hydroxide, its aqueous solution is alkaline in nature. (ii) A solution of this compound is used as the electrolyte when copper is purified. (iii) When this compound is electrolysed in the molten state, lead is obtained at the cathode. (iv) This compound can be oxidized to chlorine. (v) This compound smells of rotten eggs. (vi) This compound can be reduced to copper when heated with coke.

Assertion : Pb_(2)O_(4) react with HNO_(2) and form PbO_(2) Reason: Lead is stable in +4 oxidation state.

Write down the reactions involved in the extraction of Pb . What of the oxidation number of lead in litharge ?

In Borax bead test, metal oxides react with B_(2)O_(3) and form a coloured bead. This bead contains

Write a balanced chemical equation for each of the following reactions and also classify them. (a) Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution. (b) A piece of sodium metal is added to absolute ethanol to form sodim ethoxide and hydrogen gas. (c) Iron (III) oxide on heating with carbon monoxide gas reacts to form solid iron and liberates carbon dioxide gas. (d) Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.

From the list of gases given, choose the gas/gases which match the description given below: Gases : Ammonia, nitrogen dioxide, methane, nitric oxide, hydrogen, oxygen, chlorine, nitrogen. The gas liberated when conc. HCl reacts with potassium dichromate solution.