Chemical Bonding — Chemistry STD 10 — Question

When conc. sulphuric acid is boiled with nitre, the colour of the gas evolved is ________ . [yellowish brown/pale green]

Ionic compounds conduct electricity in their __________.

The general formula for alkene and alkyne are _____ and ______ respectively.

The salt prepared by the method of direct combination is __________.

The ________ compounds in fused state or aqueous solution are good conductors of electricity. (ionic/covalent)

An alkaline solution which gives dense white fumes with hydrochloric acid gas is ________. [sodium hydroxide/ammonium hydroxide]

Sulphuric acid absorbs sulphur trioxide and forms. _______ .

Fill in the blanks :
A solution of HCl gas in water conducts electricity because ………......., but a solution of HCl gas in toluene does not conduct an electric current because ………....... 

One volume of water at room temperature absorbs ________ volumes of hydrogen chloride gas. [700/450]

Sodium chloride is _______.