[ Question Bank ] - 2022 — Science STD 10 — Question

Give reasons for the following:
Blue colour of copper sulphate solution is destroyed when iron filings are added to it.

Write the balanced equations for the following reactions, and add the state symbols:
Magnesium carbonate reacts with hydrochloric acid to produce magnesium chloride, carbon dioxide and water.

Fluorine, Sulphur. Bromine, Iodine.

Name the hardest natural substance known.

What happens when a ray of ordinary light is passed through a triangular glass prism?

What is the usual number of valence electrons and valency of group 18 elements of the periodic table?

Find the odd one out: Tehari, Koyana, Srishailam, Tarapur

Maximum energy generation in India is done using …………… energy.

An electrician has wired a house in such a way that if a lamp gets fused in one room of the house, all the lamps in other rooms of the house stop working. What is the defect in the wiring?

What happens when ethanoic acid reacts with sodium hydroxide? Write equation of the reaction involved.