Chemistry in Daily Life — Part 5: 27 MCQs with Explanations

The chemical name of Laughing gas is Nitrous oxide .

Water expands on freezing is the correct answer to “When water is filled in a bottle and is allowed to freeze, the bottle breaks because”. Items of this type are drawn from the Chemistry in Daily Life — Part 5 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

Silicon Dioxide is the correct answer to “The chemical name of quartz is:”. Items of this type are drawn from the Chemistry in Daily Life — Part 5 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

Materials for rain-proof coats and tents owe their water proof properties to Surface tension .

Detergents dissolved in water help in cleaning clothes by Reducing the surface tension of water .

Scalding with steam is more severe than scalding by boiling water because Steam contains more energy than boiling water .

Water is a highly effective coolant for a car engine because Water has very high specific heat capacity .

Lead ball falls through water more slowly than through air because Of the viscous force in water .

80% is the correct answer to “The cow’s milk contains how much amount of water in terms of percentage”. Items of this type are drawn from the Chemistry in Daily Life — Part 5 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

One tenth is the correct answer to “An iceberg is floating in sea. How much of its mass will remain above the surface of water”. Items of this type are drawn from the Chemistry in Daily Life — Part 5 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

German Silver is an alloy of Cu + Ni .

Bronze is an alloy of Copper and Tin .

Chemical name of vinegar is Dilute acetic acid .

Chemical used to kill rats and mice are Rodenticides.

Artificial nuclear radioactivity is the correct answer to “Basic metals can be converted into gold by”. Items of this type are drawn from the Chemistry in Daily Life — Part 5 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

copper, tin is the correct answer to “Bronze medal is made up of metals”. Items of this type are drawn from the Chemistry in Daily Life — Part 5 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

Nitrogen + Oxygen is the correct answer to “Laughing gas has chemical composition of following two elements”. Items of this type are drawn from the Chemistry in Daily Life — Part 5 syllabus of Pakistani competitive exams, where the fact is tested verbatim.

About 50% of the Earth’s crust, including the waters on the Earth and atmosphere, is Oxygen.

Acid rain is mainly caused by emissions of Sulfur Dioxide and Nitrogen Oxide in the atmosphere.

Water covers 71% of the Earth’s surface.

The salinity of sea water is determined by the amount of common salt (Sodium Chloride) in 1 kg of sea water.

The gas, commonly known as “laughing gas”, is Nitrous Oxide.

Oxidation is a chemical reaction involving the Loss of Electrons .

The gas used in a refrigerator to cool water is Tetrafluoroethane .

A device which converts chemical energy into electrical energy is called battery .

The density of water is 1 g/cm .

For a fixed mass of gass at constant temperature, if we decrease volume, the pressure will increase .