Chemical equations and reactions

The respiration process during which glucose undergoes slow combustion by combining with oxygen in the cells of our body to produce energy, is a kind of:

• Exothermic process

• Endothermic process

• Reversible process

• Physical process

It is necessary to balance a chemical equation in order to satisfy the law of:

• Conservation of motion

• Conservation of momentum

• Conservation of energy

• Conservation of mass

When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from:

• Blue to green.

• Green to blue.

• Green to brown.

• Green to yellow.

Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to:

• Make the ribbon surface shinier

• Remove the layer of magnesium oxide from the ribbon surface

• Remove the layer of magnesium carbonate from the ribbon surface

• Remove the moisture from the ribbon surface

What is the another name of quick lime?

• Calcium hydroxide

• Calcium oxide

• Carbon dioxide

• Sodium oxide

Heating of ferrous sulphate gives which of the following product?

• Ferric oxide

• Sulphur dioxide

• Sulphur trioxide

• All of the above

Which of the following product is formed when calcium oxide reacts with water?

• Slaked lime

• Carbon dioxide

• Calcium oxide

• Oxygen gas

What happens when sodium sulphate solution is mixed with the solution of barium chloride?

• No reaction takes place

• Barium sulphate is formed

• Sulphur dioxide gas is formed

• Sodium sulphate is formed

Why are articles made of iron painted to prevent rust?

• Paint makes articles made of iron beautiful

• Paint prevents iron articles to come in contact with moisture present in air.

• Paint prevents iron articles to getting sticky

• All of the above

Which of the following is termed as exothermic reaction?

• Reaction in which heat is evolved

• Reaction in which heat is absorbed

• Reaction in which there is loss of oxygen

• Reaction in which there is gain of hydrogen