Metals and Non-Metals — Science STD 10 — Question

P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn:

1. Blue litmus red?
2. Red litmus blue?

Describe one reaction of ethanol.

Catenation is the ability of an atom to form bonds with other atoms of the same element. It is exhibited by both carbon and silicon. Compare the ability of catenation of the two elements. Give reasons.

Give two examples each of organic acids and mineral acids.

A gas is evolved when ethanol reacts with sodium. Name the gas evolved and also write the balanced chemical equation of the reaction involved.

What happens when carbon dioxide gas is passed through lime water:

1. for a short time?
2. for a considerable time?

Write equations of the reactions involved.

How would you show that iron is chemically more reactive than copper?

Write a balanced chemical equation for each of the following reaction and also classify them.
Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.

Give the molecular formula of one homologue of each of the following:

1. C₃H₆
2. C₂H₆
3. C₂H₂