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Non-Metals and Their Compounds

312 MCQ questions with answers and explanations · page 2 of 13

Test yourself▶ 25 question test▶ 50 question test

Q26. The pH value of pure water is—

  1. A2
  2. B7
  3. C9
  4. D14
Show answer & explanation

Answer: B) 7

Q27. At what temperature is the density of water highest?

  1. A0°C
  2. B4°F
  3. C4K
  4. D4°C
Show answer & explanation

Answer: D) 4°C

Q28. The density of water when heated from 0°C to 100°C is ____

  1. Aincreases up to 4°C and then decreases.
  2. Bdecreases to 4°C and then increases
  3. Cincreases as the temperature rises
  4. Ddecreases as the temperature increases
Show answer & explanation

Answer: A) increases up to 4°C and then decreases.

Q29. What is the reason for the higher boiling point of water compared to hydrogen sulphide or hydrogen chloride?

  1. Apolar covalent bonding
  2. Bhydrogen bonding
  3. CWonderwalls Attractions
  4. DBipolar insulation
Show answer & explanation

Answer: B) hydrogen bonding

Q30. The chemical formula of water is_

  1. AC²
  2. BCo²
  3. CH²O
  4. DCH⁴
Show answer & explanation

Answer: C) H²O

Q31. Approximately what percentage of the world's land area is covered by water?

  1. A0.71
  2. B0.76
  3. C0.66
  4. D0.29
Show answer & explanation

Answer: A) 0.71

Q32. When salt is added to water, the boiling and freezing points of water increase.

  1. Awill increase
  2. Bwill decrease
  3. Cwill increase and decrease gradually
  4. Dwill gradually increase and decrease
Show answer & explanation

Answer: C) will increase and decrease gradually

Q33. In rural areas, water is disinfected by ____.

  1. Aby sodium chloride
  2. Bby chlorine
  3. Cby potassium permanganate
  4. Dby sodium sulphate
Show answer & explanation

Answer: B) by chlorine

Q34. potassium permanganate to water

  1. AMakes it germ-free
  2. BMakes it delicious
  3. CMakes it transparent
  4. DMakes it odor free.
Show answer & explanation

Answer: A) Makes it germ-free

Q35. Which of the following is a conductor of electricity?

  1. Arubber
  2. Bpure water
  3. Csalt water
  4. Dbenzene
Show answer & explanation

Answer: C) salt water

Q36. By which process can pure water be obtained from sea water?

  1. ABy distillation
  2. BBy compaction
  3. Cby evaporation
  4. Dby fractional distillation
Show answer & explanation

Answer: A) By distillation

Q37. Sea water contains more salt than rain water because _____.

  1. ARivers bring salts with them.
  2. BThere are salt rocks inside the sea.
  3. CThe atmosphere around the sea is salty.
  4. DAnimals living in the sea produce salt.
Show answer & explanation

Answer: A) Rivers bring salts with them.

Q38. Temporary hardness of water is due to the presence of

  1. Abicarbonates of calcium and magnesium
  2. BSulphates of calcium and magnesium
  3. CNitrates of calcium and magnesium
  4. Dchlorides of calcium and magnesium
Show answer & explanation

Answer: A) bicarbonates of calcium and magnesium

Q39. Permanent hardness in water is due to the presence of

  1. ASulphates of sodium and potassium
  2. BSulphates of magnesium and calcium
  3. Ccarbonates of sodium and magnesium
  4. Dbicarbonates of magnesium and calcium
Show answer & explanation

Answer: B) Sulphates of magnesium and calcium

Q40. .......... is used to remove permanent hardness of water.

  1. ABaking Soda
  2. BLime
  3. Cbleaching powder
  4. Dwashing soda
Show answer & explanation

Answer: D) washing soda

Q41. What is the function of heavy water in a nuclear reactor?

  1. ADecreasing the speed of neutrons
  2. Bincreasing the speed of neutrons
  3. CCooling the reactor
  4. Dstop nuclear activity
Show answer & explanation

Answer: A) Decreasing the speed of neutrons

Q42. Heavy water is used as a coolant in nuclear reactors. Heavy water

  1. AContains mineral rich water.
  2. BOzonated water is
  3. CWater containing heavy metal minerals is
  4. DWater contains heavy isotopes of hydrogen.
Show answer & explanation

Answer: D) Water contains heavy isotopes of hydrogen.

Q43. What is the chemical composition of heavy water?

  1. AH²O²
  2. BHO²
  3. CHDO
  4. DD²O
Show answer & explanation

Answer: D) D²O

Q44. The molecular weight of heavy water is ____

  1. A18
  2. B20
  3. C22
  4. D24
Show answer & explanation

Answer: B) 20

Q45. What happens in water that it is called 'heavy water'?

  1. Aheavy isotope of hydrogen
  2. Bheavy isotope of oxygen
  3. Catomic number of hydrogen atoms
  4. Dmolecular number of oxygen atoms
Show answer & explanation

Answer: A) heavy isotope of hydrogen

Q46. Heavy water is a type of_

  1. Acoolant is
  2. Bis dim
  3. Core is
  4. Dfuel is
Show answer & explanation

Answer: B) is dim

Q47. Used in bleaching hair

  1. ASulfuric good
  2. Boxalic acid
  3. Chydrogen peroxide
  4. Dheavy water
Show answer & explanation

Answer: C) hydrogen peroxide

Q48. It is used to restore the colours of old oil paintings.

  1. Asulfuric acid
  2. Boxalic acid
  3. Chydrogen peroxide
  4. Dheavy water
Show answer & explanation

Answer: C) hydrogen peroxide

Q49. Carbon is a_

  1. AMetal
  2. Bnonmetal
  3. Cmetalloid
  4. Dcompound
Show answer & explanation

Answer: B) nonmetal

Q50. The essential element of all organic compounds is ______.

  1. Anitrogen
  2. Boxygen
  3. CCarbon
  4. Dsulfur
Show answer & explanation

Answer: C) Carbon

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