Chemistry MCQs with answers Page - 41

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Q. The process of removing calcium and magnesium from hard water is known as

  • (A) Sedimentation
  • (B) Filtration
  • (C) Flocculation
  • (D) Water softening

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Q. Hard water and soft water can be distinguished by using

  • (A) Dilute acid
  • (B) Ordinary soap
  • (C) Detergent
  • (D) Liquid soap

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Q. Which method will be employed to test the hardness of water?

  • (A) Boiling
  • (B) Distillation
  • (C) Formation of lather with soap
  • (D) None of these

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Q. The purest form of water is

  • (A) Tap water
  • (B) Rain water
  • (C) Ground water
  • (D) Distilled water

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Q. Water cycle refers to

  • (A) An integrated attempt to recycle water in relatively arid regions
  • (B) Constant movement of water from ocean to land and back to ocean once again
  • (C) Scientific management of water in areas excessively plagued with water-logging
  • (D) Water distribution in relatively dry areas

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Q. Permanent hardness of water may be removed by addition of

  • (A) Alum
  • (B) Sodium carbonate
  • (C) Lime
  • (D) Potassium Permangante

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Q. Acid rain is caused due to pollution of atmosphere by

  • (A) Oxides of carbon and nitrogen
  • (B) Oxides of nitrogen and sulphur
  • (C) Oxides of nitrogen and phosphorous
  • (D) None of these

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Q. What are the components responsible for acid rain?

  • (A) Nitrogen monoxide (NO) and Carbon monoxide (CO)
  • (B) Sulphur dioxide (SO2) and Nitrogen oxides (NOx)
  • (C) Carbon dioxide (CO2) and Carbon monoxide (CO)
  • (D) Oxides of carbon (COx) and Oxides of nitrogen (NOx)

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Q. Which gas emitted by power stations causes acid rain?

  • (A) Carbon dioxide
  • (B) Sulphur dioxide
  • (C) Helium
  • (D) Nitrogen

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Q. A mixture of two metals may be called by the general name
1.Amalgam
2.Alkali metal
3.Nobel metal
4.Alloy The correct answers are:

  • (A) 1 and 2
  • (B) 1 and 4
  • (C) 2 and 4
  • (D) 1, 3 and 4

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