Write the equation for the following and balance it.

Ammonium dichromate on heating decomposes into chromium oxide, water vapour and nitrogen.

Write the equation for the following and balance it.

Iron $\left(\mathrm{Ill}\right)$  chloride dissolves in water producing Iron $\left(\mathrm{Ill}\right)$ hydroxide and hydrochloric acid.

Write the equation for the following and balance it.

Magnesium reacts with nitrogen to give magnesium nitride.

Write the equation for the following and balance it.

Phosphorus burns in oxygen to give phosphorus pentoxide.

Choose the correct word or letter from the bracket to complete the sentence.

Separation of hydrogen from carbon dioxide is achieved by passing the mixture through _____. (ammoniacal cuprous chloride, potassium hydroxide solution)

Choose the correct word or letter from the bracket to complete the sentence.

Copper oxide reacts with hydrogen to produce copper and water. Copper oxide is _____ (reduced/ oxidised) in this reaction. 

Choose the correct word or letter from the bracket to complete the sentence.

Atomic number is equal to the number of _____ (protons, nucleons, neutrons) in an atom.

Choose the correct word or letter from the brackets to complete the sentence.

The solubility of a gas in a liquid _____(decreases, increases) with rise in temperature.