Periodic Properties And Variation Of Properties Physical And Chemical — Chemistry STD 10 — Question

A gaseous hydrocarbon of vapour density 29, contains 82.76% of carbon and rest hydrogen. [C = 12; H = 1]
The molecular formula of the gaseous hydrocarbon is:

When the equal volumes of hydrogen gas and chlorine gas are exposed to diffused sunlight, the reaction :

A metal which liberates hydrogen on treating with dilute nitric acid is :

Which bond is formed by the sharing of electrons between two atoms?

Most reactive character among the elements given below is found in ________ .

Assertion (A): Ionisation potential decreases on moving down the group.
Reason (R): The successive addition of shells overweighs the increased nuclear charge down the group.

Choose the correct answer from the options given below :
The drying agent used to dry HCl gas is : ________ .

Assertion (A): Noble gases are unreactive, while atoms of other elements are chemically reactive.
Reason (R): Atoms of other elements complete their octet by losing or gaining electrons.

Soda-lime is a mixture of ________ .