Chemistry

55 questions in Science & Technology.

Asked in 2025, 2024, 2021, 2019, 2014, 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003

2025 · Q85 Science & TechnologyChemistryeasy

Artificial way of causing rainfall to reduce air pollution makes use of

(a)silver iodide and potassium iodide
(b)silver nitrate and potassium iodide
(c)silver iodide and potassium nitrate
(d)silver nitrate and potassium chloride

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Official answer(a) silver iodide and potassium iodide

2024 · Q36 Science & TechnologyChemistrymoderate

In which of the following are hydrogels used ? 1. Controlled drug delivery in patients 2. Mobile air-conditioning systems 3. Preparation of industrial lubricants Select the correct answer using the code given below :

(a)1 only
(b)1 and 2 only
(c)2 and 3 only
(d)1, 2 and 3

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Official answer(a) 1 only

2021 · Q71 Science & TechnologyChemistryeasy

Water can dissolve more substances than any other liquid because

(a)it is dipolar in nature
(b)it is a good conductor of heat
(c)it has high value of specific heat
(d)it is an oxide of hydrogen

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Official answer(a) it is dipolar in nature

2019 · Q39 Science & TechnologyChemistryeasy

In India, the use of carbofuran, methyl parathion, phorate and triazophos is viewed with apprehension. These chemicals are used as

(a)pesticides in agriculture
(b)preservatives in processed foods
(c)fruit-ripening agents
(d)moisturising agents in cosmetics

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Official answer(a) pesticides in agriculture

2014 · Q70 Science & TechnologyChemistryeasy

Which of the following is/are the example/examples of chemical change? 1. Crystallization of sodium chloride 2. Melting of ice 3. Souring of milk Select the correct answer using the code given below.

(a)1 and 2 only
(b)3 only
(c)1, 2 and 3
(d)None

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Official answer(b) 3 only

2010 · Q11 Science & TechnologyChemistryeasy

Chlorination is a process used for water purification. The disinfecting action of chlorine is mainly due to

(a)The formation of hydrochloric acid when chlorine is added to water
(b)The formation of hypochlorous acid when chlorine is added to water
(c)The formation of nascent oxygen when chlorine is added to water
(d)The formation of hydrogen when chlorine is added to water

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Official answer(b) The formation of hypochlorous acid when chlorine is added to water

2009 · Q72 Science & TechnologyChemistryeasy

Which one of the following is used as an explosive ?

(a)Phosphorus trichloride
(b)Mercuric oxide
(c)Graphite
(d)Nitroglycerine

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Official answer(d) Nitroglycerine

2008 · Q8 Science & TechnologyChemistryeasy

What is Bisphenol A (BPA)?

(a)A medical test for detecting cancer
(b)A test for testing the use of drugs to improve performance by athletes
(c)A chemical used for the development of food-packaging materials
(d)A special type of alloy steel

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Official answer(c) A chemical used for the development of food-packaging materials

2008 · Q60 Science & TechnologyChemistryeasy

What is Agent Orange?

(a)An ace spying group trained by the Police in London
(b)A weed-killing chemical used by the US Military in the Vietnam War
(c)A technique used in the advanced railway safety procedure
(d)A special chemical used in making alloy steel

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Official answer(b) A weed-killing chemical used by the US Military in the Vietnam War

2008 · Q77 Science & TechnologyChemistryeasy

Who among the following discovered heavy water?

(a)Heinrich Hertz
(b)H. C. Urey
(c)G. Mendel
(d)Joseph Priestley

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Official answer(b) H. C. Urey

2008 · Q114 Science & TechnologyChemistryeasy

Which one of the following is also called Stranger Gas?

(a)Argon
(b)Neon
(c)Xenon
(d)Nitrous oxide

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Official answer(c) Xenon

2008 · Q116 Science & TechnologyChemistryeasy

Which one of the following pairs of metals constitutes the lightest metal and the heaviest metal, respectively?

(a)Lithium and mercury
(b)Lithium and osmium
(c)Aluminium and osmium
(d)Aluminium and mercury

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Official answer(b) Lithium and osmium

2007 · Q103 Science & TechnologyChemistryeasy

Which one of the following is another name of RDX?

(a)Cyanohydrin
(b)Dextran
(c)Cyclohexane
(d)Cyclonite

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Official answer(d) Cyclonite

2007 · Q121 Science & TechnologyChemistryeasy

Which one of the following is called Philosopher’s wool?

(a)Zinc Bromide
(b)Zinc Nitrate
(c)Zinc Oxide
(d)Zinc Chloride

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Official answer(c) Zinc Oxide

2007 · Q122 Science & TechnologyChemistryeasy

Which one of the following does not contain silver?

(a)Horn Silver
(b)German Silver
(c)Ruby Silver
(d)Lunar Caustic

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Official answer(b) German Silver

2006 · Q5 Science & TechnologyChemistrymoderate

Consider the following chemicals: 1. Benzene 2. Carbon tetrachloride 3. Sodium carbonate 4. Trichloroethylene Which of the above is/are used as dry-cleaning chemicals?

(a)1 only
(b)2 only
(c)1, 2 and 4 only
(d)1, 2, 3 and 4

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Official answer(c) 1, 2 and 4 only

2005 · Q16 Science & TechnologyChemistrymoderate

Consider the following statements : 1. Anhydrous sodium carbonate is commonly known as baking soda 2. Baking soda is used in fire extinguishers 3. Bleaching powder is manufactured in Hasenclever plant Which of the statements given above is/are correct?

(a)1, 2 and 3
(b)2 and 3
(c)3 only
(d)1 and 2

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Official answer(b) 2 and 3

2004 · Q56 Science & TechnologyChemistryeasy

Consider the following statements: 1. Banking soda is used in fire extinguishers. 2. Quicklime is used in the manufacture of glass. 3. Gypsum is used in the manufacture of Plaster of Paris. Which of the statements given above is/are correct?

(a)1 and 2
(b)2 and 3
(c)1 only
(d)1, 2 and 3

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Official answer(d) 1, 2 and 3

2004 · Q129 Science & TechnologyChemistryeasy

Salts of which of the following elements provide colours to fireworks?

(a)Zinc and sulphur
(b)Potassium and mercury
(c)Strontium and barium
(d)Chromium and nickel

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Official answer(c) Strontium and barium

2003 · Q29 Science & TechnologyChemistryeasy

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 toothpaste
(c)Bordeaux mixture consists of sodium sulphate and lime
(d)Zinc amalgams are used as a dental filling

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Official answer(a) Liquid sodium is employed as a coolant in nuclear reactors

2003 · Q45 Science & TechnologyChemistryeasy

Consider the following statements The purpose of adding sodium sulphate and sodium silicate to the detergent in a washing powder is 1. To keep the washing powder dry 2. To maintain the alkalinity of the powder Which of these statements is/are correct?

(a)Only 1
(b)Only 2
(c)Both 1 and 2
(d)Neither 1 nor 2

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Official answer(c) Both 1 and 2

2003 · Q105 Science & TechnologyChemistryeasy

Assertion (A): In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group. Reason (R): In a group, the atomic radius generally increases from top to bottom.

(a)Both A and R are individually true and R is the correct explanation of A
(b)Both A and R are individually true but R is NOT the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true

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Official answer(d) A is false but R is true

2003 · Q108 Science & TechnologyChemistrymoderate

Assertion (A): Unsaturated fats are more reactive compared with the saturated fats. Reason (R): Unsaturated fats have only single bonds in their structure.

(a)Both A and R are individually true and R is the correct explanation of A
(b)Both A and R are individually true but R is NOT the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true

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Official answer(c) A is true but R is false

2003 · Q144 Science & TechnologyChemistryeasy

With reference to ionic compounds, consider the following statements: 1. Ionic compounds are insoluble in alcohol. 2. Ionic compounds in the solid state are good conductors of electricity. Which of these statements is/are correct?

(a)Only 1
(b)Only 2
(c)Both 1 and 2
(d)Neither 1 nor 2

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Official answer(a) Only 1

2003 · Q145 Science & TechnologyChemistrymoderate

Which one of the following statements is correct?

(a)The presence of NaCl increases the rate of setting of Plaster of Paris
(b)Gypsum is added to the cement to slow down its rate of setting
(c)All alkaline earth metals form hydrated salts
(d)Barium and Strontium are found free in nature

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Official answer(d) Barium and Strontium are found free in nature