Chemistry · NDA previous year questions

2016 33 questions

1. Q792016 · 17 Apr 2016

   Which one of the following is a reduction reaction?

   1. A.$2Mg(\mathrm{s})+{\mathrm{O}}_2(\mathrm{g})\to 2MgO(\mathrm{s})$
   2. B.$\mathrm{S}(\mathrm{s})+{\mathrm{O}}_2(\mathrm{g})\to \mathrm{S}{\mathrm{O}}_2(\mathrm{g})$
   3. C.$2HgO(\mathrm{s})\to 2Hg(l)+{\mathrm{O}}_2(\mathrm{g})$ (heat)
   4. D.$\mathrm{Mg}(\mathrm{s})+\mathrm{S}(\mathrm{s})\to \mathrm{MgS}(\mathrm{s})$
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   Answer: C

2. Q802016 · 17 Apr 2016

   Which one of the following oxides of nitrogen is known as ‘anhydride’ of nitric acid?

   1. A.${\mathrm{N}}_2\mathrm{O}$
   2. B.${\mathrm{N}}_2{\mathrm{O}}_3$
   3. C.$\mathrm{N}{\mathrm{O}}_2$
   4. D.${\mathrm{N}}_2{\mathrm{O}}_5$
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   Answer: D

3. Q812016 · 17 Apr 2016

   Which one of the following is the chemical name for baking soda?

   1. A.Sodium bicarbonate (Sodium hydrogen carbonate)
   2. B.Sodium carbonate
   3. C.Potassium bicarbonate (Potassium hydrogen carbonate)
   4. D.Potassium carbonate
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   Answer: A

4. Q822016 · 17 Apr 2016

   Directions: The following 05 (Five) items consist of two statements, Statement I and Statement II. Examine these two statements carefully and select the answers to these items using the code given below: Code: Statement I: Petroleum is a mixture of many different hydrocarbons of different densities. Statement II: The grade of petroleum depends mainly on the relative proportion of the different hydrocarbons.

   1. A.Both the Statements are individually true and Statement II is the correct explanation of Statement I.
   2. B.Both the Statements are individually true but Statement II is not the correct explanation of Statement I.
   3. C.Statement I is true but Statement II is false.
   4. D.Statement I is false but Statement II is true.
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   Answer: B

5. Q852016 · 17 Apr 2016

   Which one of the following is not a chemical change?

   1. A.Ripening of fruits
   2. B.Curdling of milk
   3. C.Freezing of water
   4. D.Digestion of food
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   Answer: C

6. Q862016 · 17 Apr 2016

   Soap is sodium or potassium salt of

   1. A.Stearic acid
   2. B.Oleic acid
   3. C.Palmitic acid
   4. D.All of the above
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   Answer: D

7. Q872016 · 17 Apr 2016

   Which one of the following carbon compounds will not give a sooty flame?

   1. A.Benzene
   2. B.Hexane
   3. C.Naphthalene
   4. D.Anthracene
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   Answer: B

8. Q952016 · 17 Apr 2016

   One of the main causes of air pollution in cities is emissions from vehicles like cars and trucks. Cars omit various pollutants which are bad for human health when inhaled, like 1. Nitrogen oxides ($\mathrm{N}{\mathrm{O}}_{\mathrm{x}}$) 2. Carbon monoxide ($\mathrm{CO}$) 3. Carbon dioxide ($\mathrm{C}{\mathrm{O}}_2$) 4. Benzene Which of the above pollutants are not tolerated by human beings even at very low levels?

   1. A.1 and 4 only
   2. B.1 and 2 only
   3. C.1, 2 and 3 only
   4. D.1, 2 and 4 only
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   Answer: D