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Tuesday, 19 May 2026
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Chemistry Past Questions and Answers

Chemistry Questions

Question 376:
In the Haber process for the manufacture of ammonia, finely divided iron is used as
  • A An ionizing agent
  • B A reducing agent
  • C A catalyst
  • D A dehydrating agent
  • E An oxidizing agent
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Question 377:
The hybridization of the carbon atom in ethyne is
  • A Sp <sup style='font-size: smaller;'>4</sup>
  • B Sp <sup style='font-size: smaller;'>3</sup>
  • C Sp<sup style='font-size: smaller;'>2</sup>
  • D Sp
  • E S
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Question 378:
An organic compound with a vapour density 56.5 has the following percentage composition:C =53.1% N = 12.4%, O = 28.3%, H = 6.2%. The molecular formula of the compound is <br/>Relative atomic masses: N = 14, O = 16, C = 12, H = 1 )
  • A C<sub style='font-size: smaller;'>3</sub>H<sub style='font-size: smaller;'>6</sub>O<sub style='font-size: smaller;'>2</sub>N
  • B C<sub style='font-size: smaller;'>5</sub>H<sub style='font-size: smaller;'>6</sub>O<sub style='font-size: smaller;'>2</sub>N
  • C (C<sub style='font-size: smaller;'>5</sub>H<sub style='font-size: smaller;'>7</sub>O<sub style='font-size: smaller;'>2</sub>N)<sub style='font-size: smaller;'>1/2</sub>
  • D C<sub style='font-size: smaller;'>5</sub>H<sub style='font-size: smaller;'>7</sub>O<sub style='font-size: smaller;'>2</sub>N
  • E (C<sub style='font-size: smaller;'>5</sub>H<sub style='font-size: smaller;'>7</sub>O<sub style='font-size: smaller;'>2</sub>N)<sub style='font-size: smaller;'>2</sub>
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Question 379:
When the kerosene fraction from petrol is heated at high temperature, a lower boiling liquid is obtained. This process is known as
  • A Polymerization
  • B Refining
  • C Hydrogenation
  • D Cracking
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Question 380:
Alkaline hydrolysis of naturally occurring fats and oils yields
  • A Fats and acids
  • B Soaps and glycerol
  • C Margarine and butter
  • D Esters
  • E Detergents
View Answer & Explanation