CHEMICAL REACTIONS

Which gas is evolved when zinc is added to dilute sulphuric acid?

• Hydrogen

• Oxygen

• Sulphur dioxide

• Sulphur trioxide

Which gas is evolved when sodium carbonate reacts dilute hydrochloric acid?

• Carbon monoxide

• Carbon dioxide

• Chlorine

• Sodium oxide

Precipitate formed during any chemical reaction occurs in which state?

• Solid

• Liquid

• Gaseous

• Plasma

The colour of ferrous sulphate is :

• Red

• Yellow

• Green

• Blue

The compound 'calcium hydroxide' is known as :

• Lime

• Quicklime

• Slacked lime

• Lime water

Which of the following is an exothermic reaction?

• Electrolysis of water

• Photosynthesis

• Burning of methane

• Decomposition of calcium carbonate

Which of the following is an endothermic reaction?

• Respiration

• Slacking of lime

• Formation of carbon monoxide

• Formation of nitrogen monoxide

What does the symbol of 'aq' represents in a chemical reaction?

• Aqifer

• Aquaria

• Aqueous

• Aquatic

Which of the following does not involve a chemical reaction?

• Digestion

• Respiration

• Burning of candle wax

• Melting of candle wax

The chemical equations are balance to satisfy :

• Law of conservation of momentum

• Law of conservation of mass

• Law of conservation of motion

• Law of conservation of magnetism