Page Number- 8

(1) The least electronegative element among the following is??

  • A. B
  • B. In
  • C. Al
  • D. TI
0
(c) Al

(2) Which element has the highest melting point of the group 13??

  • A. B
  • B. Al
  • C. Ga
  • D. In
0
(a) B

(3) The element that cannot be detected by the point of the group??

  • A. Nitrogen
  • B. Sulphur
  • C. Chlorine
  • D. Oxygen
0
(d) Oxygen

(4) A mixture of aniline and chloroform can be easily separated by??

  • A. Distillation
  • B. Fractional distillation
  • C. Steam distillation
  • D. Sublimation
0
(a) Distillation

(5) Normally rain rainwater has a pH of??

  • A. 12.5
  • B. 3.6
  • C. 5.6
  • D. 1.6
0
(c) 5.6

(6) The tolerable limit of Lead in drinking water??

  • A. 50ppb
  • B. 100ppb
  • C. 300ppb
  • D. 500ppb
0
(a) 50ppb

(7) What particular pollutant is present in the troposphere??

  • A. Dust
  • B. Mist
  • C. Smog
  • D. All
0
(d) All

(8) What particular pollutant is present in the troposphere??

  • A. Dust
  • B. Mist
  • C. Smog
  • D. All
0
(d) All

(9) CO2 is released into the atmosphere by??

  • A. Respiration
  • B. Burning of fossil fuel
  • C. Decomposition of limestone
  • D. All of these
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(d) All of these

(10) Brown mottling of teeth is caused by to excess concentration by??

  • A. F-
  • B. Cl-
  • C. Br-
  • D. I-
0
(a) F-
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