Effect of heat on salts (form 4)

1. Limewater in diagram turns cloudy.

What is the gas released?

• Hydrogen

• Oxygen

• Carbon dioxide

• Ammonia

Name the gas released which lights up glowing splinter

• carbon dioxide

• ammonia

• hydrogen

• oxygen

Which of the following gas has brown colour?

• nitrogen

• nitrogen dioxide

• ammonia

• chlorine gas

nitrogen dioxide is .........

• acidic

• alkali

• neutral

Which of the gasouses has pungent smell.

• chlorine gas

• nitrogen

• ammonia

• carbon dioxide

Which one is the chemical equations for effect of heat on copper(II) carbonate?

• CuCO₃

• CuCO₃ --> CuO + CO₂

• 2Cu(NO₃)₂ --> 2CuO + 4NO₂ + 2O₂

• CuO + CO₂

What can be observe when copper (II) carbonate is heated?

• It remains white during hot and cool.

• it turns yellow when hot and white when cool.

• it turns black

What is (are) produce when nitrate salt is heated?

• carbon dioxide

• nitrogen

• oxygen

• nitrogen dioxide

What salt can decompose during heating?

• Zinc carbonate

• sodium carbonate

• ammonium nitrate

• zinc sulphate

What happen when nitrate salt is heated?

• The gas released turns lime water chalky.

• The gas released rekindles the glowing wooden splinter

• The gas released turns moist blue litmus paper to red.

• The gas released turns moist red litmus paper to blue.