Metals and Non-Metals — Science STD 10 — Question

Explain the given reaction with the example:

Combustion reaction.

Zinc oxide reacts with carbon, on heating, to form zinc metal and carbon monoxide. Write a balanced chemical equation for this reaction. Name:

1. Oxidising agent, and
2. Reducing agent, in this reaction.

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.

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.

Write the balanced chemical equation for the following reaction and identify the type of reaction.
Ethanol is burnt in air to form carbon dioxide, water and releases heat.

How can tooth decay be prevented ?

What will you observe when dilute ethanoic acid and dilute hydrochloric acid are put on universal indicator paper, one by one? What does it show?

An element ‘A’ has two electrons in the outermost shell of its atom and combines with an element ‘B’ having seven electrons in the outermost shell, forming the compound AB₂. The compound when dissolved in water conducts electric current. Giving reasons, state the nature of chemical bond in the compound.

State two uses of ethanol (other than as a fuel).

What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? State the physical conditions of reactants in which the reaction between them will not take place. Write the balanced chemical equation for the reaction and name the type of reaction.