IAS/IPS Prelims General Awareness - Chemistry MCQs and Answers

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Questions
1 Which one of the following is produced during the formation of photochemical smog ?
A Nitrogen oxide
B Methane
C Ozone
D Hydrocarbons

Answer: Option [A]
2 What is Bisphenol A (BPA) ?
A A special type of alloy steel
B A medical test for detecting cancer
C A chemical used for the development of food packaging materials
D A test for testing the use of drugs to improve performance by athletes

Answer: Option [C]
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3 Which one of the following is the correct sequence in increasing order of molecular weights of the hydrocarbons ?
A Butane, propane, ethane and methane
B Butane, ethane, propane and methane
C Propane, butane, ethane and methane
D Methane, ethane, propane and butane

Answer: Option [D]
4 Barium in a suitable form is administered to patients before an X-ray examination of the stomach, because
A barium salts are white in colour and this helps the stomach to appear clearly in contrast with other regions in the picture
B barium is a good absorber of X-rays and this helps the stomach to appear clearly in contrast with the other regions in the picture
C barium is a good absorber of y-rays and this helps the stomach to appear clearly in contrast with the other regions in the picture
D barium allows X-rays to pass through the stomach on account of its transparency to X-rays

Answer: Option [B]
5 The difference between a nuclear reactor and an atomic bomb is that
A the chain reaction in nuclear reactor is controlled
B the chain reaction in nuclear reactor is not controlled
C no-chain reaction takes place in atomic bomb while it takes place in nuclear reactor
D No chain reaction takes place in nuclear reactor while in the atomic bomb there is a chain reaction

Answer: Option [A]
6 Which one of the following statements is correct ?
A Liquid sodium is employed as a coolant in nuclear reactors
B Calcium carbonate is an ingredient of tooth paste
C Bordeaux mixture consists of sodium sulphate and lime
D Zinc amalgams are used as a dental filling

Answer: Option [A]
7 The most reactive among the halogens is
A Iodine
B Bromine
C Chlorine
D Fluorine

Answer: Option [D]
8 Aluminium surface are often ‘anodized’. This means the deposition of a layer of
A Zinc oxide
B Nickel oxide
C Aluminium oxide
D Chromium oxide

Answer: Option [C]
9 Excessive release of the pollutant carbon monoxide (CO) into the air may produce a condition in which Oxygen supply in the human body decreases. What causes this condition ?
A When inhaled into the human body CO is converted into CO2
B The inhaled CO has much higher affinity for haemoglobin as compared to Oxygen
C The inhaled CO destroyed the chemical structure of haemoglobin
D The inhaled CO adversely affects the respiratory centre in the brain

Answer: Option [B]
10 Regarding “carbon credits”, which one of the following statements is not correct ?
A The carbon credits system was ratified in conjunction with the Kyoto Protocol.
B The goal of the carbon credit system is to limit the increase of carbon dioxide emission.
C Carbon credits are traded at a price fixed from time to time by the United Nations Environment Programme.
D Carbon credits are awarded to countries or groups that have reduced greenhouse gases below their emission quota.

Answer: Option [C]

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