Chemical Reactions and Equations

The chemical formula of lead sulphate is

• Pb₂SO₄

• Pb(SO₄)₂

• PbSO₄

• Pb₂(SO₄)₃

The formula of lead nitrate is

• Pb₂(NO₃)₂

• Pb(NO₂)₂

• Pb(NO₃)₂

• Pb(NO₄)₂

Which of the following is formed when lead nitrate is put under thermal decomposition?

• Lead oxide

• Nitrogen dioxide

• Oxygen gas

• All of the above

Which information is not conveyed by a balanced chemical equation?

• Whether a particular reaction is actually feasible or not

• Number of atoms/molecules of the reactants and products formed

• Symbols and formulae of all the substances involved in a particular reaction

• Physical states of reactants and products

What happens when silver chloride is put under sunlight?

• Silver metal and chlorine gas are formed

• Silver metal and hydrogen gas are formed

• Only silver metal is formed

• Only hydrogen gas is formed

Chemically rust is

• hydrated ferrous oxide

• only ferric oxide

• hydrated ferric oxide

• none of these

Which of the following product is formed after heating of limestone?

• Calcium oxide

• Calcium carbonate

• Hydrogen gas

• All of the above

Both CO₂ and H₂ gases are

• soluble in water

• acidic in nature

• colorless

• heavier than air

In which of the following category will you put the reaction of heating of calcium carbonate?

• Decomposition reaction

• Thermal decomposition reaction

• Endothermic reaction

• All of the above

Which of the following gases can be used for storage of fresh sample of an oil for a long time?

• Nitrogen or oxygen

• Helium or oxygen

• Nitrogen or helium

• Carbon dioxide or oxygen