Chemistry Questions and Answers [Class 11-12]

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Question 1. Which one of the following pairs is correctly matched?

(A) Zinc Sulphide – Philosopher’ wool

(B) Zinc Phosphide – Rat poison

(C) Silver Chloride – Artificial rain

(D) Silver Iodide – Horn Silver

Question 2. Amount of rain depends on______.

(A) Temperature

(B) Water cycle

(C) Humidity in atmosphere

(D) Air pressure

Question 3. The substance used for artificial rain is______.

(A) Silver bromide

(B) Silver iodide

(C) Ammonium nitrate

(D) All of the above

Question 4. Which one of the following chemicals had been in use till now for making artificial clouds?

(A) Silver Iodide

(B) Sulphur Iodide

(C) Heavy Water

(D) Potassium Nitrate

Question 5. A pungent smell often presents near the urinals is due to_____.

(A) Urea

(B) Ammonia

(C) Chlorine

(D) Sulphur dioxide

Question 6. Which one among the following is called philosopher’s wool?

(A) Zinc Chloride

(B) Zinc Oxide

(C) Zinc Nitrate

(D) Zinc Bromide

Question 7. Which of the following is BRIT (Government of India) engaged?

(A) Road Transport

(B) Isotope Technology

(C) Information Technology

(D) Rail Coach

Question 8. Which one of the following types of glass can cut off ultraviolet rays?

(A) Crookes glass

(B) Jena glass

(C) Pyrex glass

(D) Soda glass

Question 9. One carbon credit is equivalent to____.

(A) 10000 kg of CO2

(B) 1000 kg of CO2

(C) 100 kg of CO2

(D) 10 kg of CO2

Question 10. Which of the following method is used for measuring the age of the earth?

(A) Biological clock method

(B) Uranium process

(C) Biotechnology Law

(D) Carbon dating process

Question 11. ‘Radioactive dating’ is a technique that can be used to measure______.

(A) Weight of rocks

(B) Colour of rocks

(C) Composition of rocks

(D) The age of rocks

Question 12. Carbon dating is used to determine the age of ____________.

(A) Rocks

(B) Fossils

(C) Earth

(D) Trees

Question 13. Which of the following archaeological samples is adopted to determine the age of firewood bone and shell? 

(A) Strontium-90

(B) Carbon-14

(C) Argon-Isotopes

(D) Uranium-238

Question 14. Isotope 6C14 is associated with__________.

(A) For traler technology

(B) Determining the age of fossil

(C) Determining the age of the earth

(D) For cancer diagnosis

Question 15. Aluminium Phosphide is used as__________.

(A) Fumigant

(B) Rotenticide

(C) Fungicide

(D) Insecticide

Question 16. Rodenticide is the chemical which is used to control __________.

(A) Rabbits

(B) Mouse

(C) Monkeys

(D) Bats

Question 17. Which one of the following is used as rat poison?

(A) Zinc Phosphide

(B) Calcium Phosphate

(C) Lead Sulphide

(D) Zinc Sulphide

Question 18. Which chemical substance is used for making rat poison?

(A) Ethyl Isocyanide

(B) Potassium Cyanide

(C) Methyl Isocyanate

(D) Ethyl Alcohol

Question 19. Pyrethrin used in mosquito coil is obtained from ______.

(A) A fungus

(B) A bacterium

(C) An insect

(D) A seed plant

Question 20. Which of the following is used as a mosquito repellent?

(A) None of these

(B) Ephedrine

(C) Rotenone

(D) Pyrethrum

Question 21. Which one of the following compounds is used to make fireproof clothing?

(A) Aluminium Sulphate

(B) Ferrous Sulphate

(C) Magnesium Sulphate

(D) Sodium Sulphate

Question 22. An active chemical to remove mosquitoes is _______.

(A) Benzene Hexachlorophene

(B) 2-ISO Propoxiphinyal

(C) Atropin

(D) Allethrins

Question 23. Which one of the following pairs is not correctly matched?

(A) Synthesis of transuranic elements – Enrico Fermi

(B) Theory of energy production in the sun and stars – H.A. Bethe

(C) Discovery of positron – C.D. Anderson and U.F. Hess

(D) Discovery of Meson – Hideki Yukawa

Question 24. In the ordinary fire extinguisher, carbon dioxide is generated by the reaction of_______.

(A) Magnesite and dilute hydrochloric acid

(B) Sodium bicarbonate and dilute sulphuric acid

(C) Marble powder and dilute hydrochloric acid

(D) Limestone and dilute sulphuric acid

Question 25. Which gas is used in fire extinguisher?

(A) Sulphur dioxide

(B) Oxygen

(C) Hydrogen

(D) Carbon dioxide

Question 26. Bhopal Gas Tragedy was caused due to the leakage of_____.

(A) Carbon monoxide

(B) Sulphur dioxide

(C) Nitrogen dioxide

(D) Methyl Isocyanate

Question 27. For which branch of science U.N. has designated the year 2011? 

(A) The International year of Physics

(B) The International year of Biodiversity

(C) The International year of Astronomy

(D) The International year of Chemistry

Question 28. When did the Bhopal Gas tragedy happen?

(A) 2-3 November, 1985

(B) 2-3 December, 1985

(C) 2-3 November, 1984

(D) 2-3 December, 1984

Question 29. The United Nations Framework Convention on Climate Change deals with______.

(A) reduction in fossil fuel usage

(B) reduction in Uranium production greenhouse gases emissions mitigation

(C) CO2 emissions mitigation

(D) None of the above/More than one of the above

Question 30. 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

Question 31. Which of the following countries has made it mandatory to blend ethanol with gasoline?

(A) Brazil

(B) Switzerland

(C) U.K.

(D) China

Question 32. Which of the following is an inorganic gaseous pollutant of air?

(A) Methane

(B) Hydrogen Sulphide

(C) Hydrogen Cyanide

(D) Phosgene

Question 33. The relative contributions of carbon dioxide (CO2), nitrous oxide (N2O), chlorofluorocarbons (CFCs) and methane (CH4) towards global warming are_____.

(A) CO2 > CH4 > N2O > CFCs

(B) CO2 > CFCs > CH4 > N2O

(C) CO2 > N2O > CH4 > CFCs

(D) CO2 > CH4 > CFCs > N2O

Question 34. Consider the following assertion and reason and select the correct answer from the code given below.

• Assertion (A): Ozone kills microorganisms in water.
  
• Reason (R): Ozone is not radioactive.

Code

(A) (A) is false, but (R) is true

(B) (A) is true, but (R) is false

(C) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

(D) Both (A) and (R) are true and (R) is the correct explanation of (A)