Chemistry for competitive exams – 06

1. The oxide of nitrogen used in medicine as anesthetic is

(a) Nitric oxide           (b) Nitrogen pentaoxide  (c) Nitrogen dioxide     (d) Nitrous oxide

Ans. (d) Nitrous oxide

2. Which of the following acid is used as a dehydrating and drying agent?

(a) Acetic   (b) Hydrochloric (c) Nitric  (d) Sulphuric

Ans. (d) Sulphuric

3. A flaming splinter is thrust into a bottle of Oxygen , a botlle of Nitrogen, and a bottle of Carbon-dioxide the flame will go out in

(a) Nitrogen and Carbon dioxide but not in Oxygen (b) Oxygen and Nitrogen but not in carbon-dioxide      (c) Oxygen and carbon-dioxide but not in Nitrogen (d) Each case

Ans. (a) Nitrogen and Carbon dioxide but not in Oxygen

4. Of the following chemical compounds, which one may soon by used as a fuel for driving vehicles

(a) Ethanol     (b) Ethene    (c) Ethyne   (d) Ethane

Ans. (a) Ethanol

5. What is the measure of performance of petrol in internal combustion engines?

(a) Octave number   (b) octane number    (c) crude oil fraction   (d) kerosene fraction

Ans. (b) octane number

6. Of the following drugs, which one is present in cola drinks

(a) Valium (b) cocaine     (c) opiate (d) caffeine

Ans. (d) caffeine

7. This chemical is added to water supply for the prevention of tooth decay

(a) Fluoride   (b) chloride    (c) bromide (d) sulphide

Ans. (a) Fluoride  

8. Of the following drinks , tell which one has the lowest alcohol contents

(a) Beer    (b) vodka     (c) wine    (d) Gin

Ans. (b) vodka    

9. Of the following drugs which one is present in tobacco

(a) Marijuana    (b) Heroin   (c) Nicotine   (d) cocaine

Ans. (c) Nicotine

10. Which is considered to be an anomalous compound?

(a) water    (b) sodium chloride     (c)  formic acid (d)formaldehyde

Ans. (a) water