Electrolysis — Chemistry STD 10 — Question

An oxide of metal M₂O is a/an ________ [acidic/basic/neutral] oxide.

When sodium acetate is heated with sodalime, ________ gas is evolved.[methane/ethane]

Most electropositive elements belong to ______ group.

Whenever the gases react chemically, they do so in____________which bear a simple whole number ratio to each other and to the products, if gaseous, provided the temperature and pressure of reacting gases and products remains the same.

When ammonia gas is passed through copper sulphate solution, it forms ________ [bluish white/pale blue] precipitate. This precipitate dissolves in excess of ammonia to form ________ [deep blue/deep green] colouration.

A mixture of 2 volumes of ammonia and 1 volume of oxygen, when heated electrically with a platinum filament, reacts to form ________ gas and water. [nitric oxide/nitrous oxide]

Conc. sulphuric acid is used in the laboratory preparation of nitric acid, as sulphuric acid is ________. [most volatile/least volatile]

On moving from left to right in a given period, the number of shells __________.

The following are the typical properties of dilute acid. complete them by inserting suitable words :
Sulphite/hydrogen sulphite + Acid → ............. + ............ + .............

The impurity which separates out when impure bauxite is heated with conc. sodium hydroxide is ________. [PbO/Fe₂O₃/CuO]