The gas liberated by the decomposition of cupric nitrate is of yellow colour.

Classify the following day to day activities based on chemical reactions by physical contact, solutions of reactants, heat, light, electricity and catalyst.

Fading of coloured clothes on drying under sunlight

Write the quadrants in which the following points lie:

$\left(-4,7\right)$

What are the conditions required for burning to occur?

Add $5 \mathrm{mL}$ dilute hydrochloric acid to a piece of magnesium taken in a test tube.

Which is the gas liberated in this reaction?

Touch the bottom of the test tube. What do you feel?