Chemistry MCQs with answers Page - 34

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Q. A disaccharide is formed by the chemical bonding of

  • (A) two
  • (B) two polysaccharides
  • (C) one monosaccharide and onemonosaccharides polysaccharide
  • (D) All the above

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Q. Temporary hardness is due to the presence of

  • (A) Calcium carbonate
  • (B) calcium sulphate
  • (C) magnesium sulphate
  • (D) calcium bicarbonate

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Q. Which of the following characteristics is not typical of ionically bonded crystals?

  • (A) Cleave into definite cleavage planes
  • (B) Shatters when crystal is distorted
  • (C) Has no sharp melting point
  • (D) Conducts when melted

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Q. The segment of a myofibril that is called a sarcomere runs from

  • (A) one A-band to the next A-band
  • (B) one H-zone to the next H-zone
  • (C) one Z-line to the next Z-line
  • (D) one end of a skeletal muscle to the opposite end

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Q. Consider the following statements about HPLC:
1.it stands for high performance liquid chromatography.
2.it is used to separate isomeric compounds.
3.its operations involve a solid and a liquid phase.
The correct statement(s) is/are:

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

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Q. Consider the following chemicals:
1.Benzene
2.Carbon tetrachloride
3.Sodium carbonate
4.Trichloroethylene The chemicals used as dry cleaning agent(s) is/are

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

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Q. Roxarsone, an arsenic containing nitrophenol is used as

  • (A) an oxidizing agent
  • (B) a reducing agent
  • (C) a drug to treat tuberculosis
  • (D) a food additive that is given to chickens and cows for weight gain

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Q. Bakelite is
1.Obtained from phenol and formaldehyde
2.Obtained from phenol and formic acid
3.Used as a plastic
4.Obtained from adipic acid and caprolactam The correct answers are:

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

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Q. When iron and wood are exposed to sunlight, the iron rod becomes hot quickly because of

  • (A) The less density of iron
  • (B) The greater thermal conductivity of iron
  • (C) The greater density of iron
  • (D) The lower thermal conductivity of iron

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Q. Aluminium is extracted from bauxite

  • (A) By reduction with carbon
  • (B) By reduction with Mg
  • (C) By reduction with CO
  • (D) By electrolysis in molten cryolite

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