Chemistry MCQs

Chemistry Objective (Multiple Choice) General Knowledge Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examination.

1. Which of the following are the most and the least electronegative elements in the periodic table?
[A] Fluorine and Caesium
[B] Hydrogen and Helium
[C] Carbon and Oxygen
[D] Chlorine and Fluorine

Show Answer

2. What is the key element used in the batteries of electric vehicles?
[A] Magnesium
[B] Lithium
[C] Sodium
[D] Bromine

Show Answer

3. What happens to ozone’s volume when it is heated?
[A] Increases
[B] Decreases
[C] Remains unchanged
[D] First increases, then decreases

Show Answer

4. Sodium bicarbonate decomposes above 70 °C, making it usable in bakery products. What end product of this thermal decomposition process contributes to its use in baking?
[A] Hydrogen
[B] Carbon Dioxide
[C] Water Vapor
[D] Sodium Carbonate

Show Answer

5. The vegetable oil treated with which among the following halogens makes it an additive, which is used in artificial citrus flavoured aerated drinks to give it the cloudy look, so that consumers get deceived because it appears natural citrus drink?
[A] Chlorine
[B] Bromine
[C] Iodine
[D] Fluorine

Show Answer

6. Which of the following element is NOT an alkaline earth metal?
[A] Magnesium
[B] Strontium
[C] Barium
[D] Beryllium

Show Answer

7. What is the half life of the longest lived isotope of Francium?
[A] 1 minute
[B] 21 minute
[C] 21 hours
[D] 100 days

Show Answer

8. Which of these compounds is also known as wood spirit?
[A] Ethanol
[B] Methanol
[C] Propanol
[D] None of the above

Show Answer

9. How is Aqua regia formed?
[A] by mixing 2 parts of concentrated HCl and one part of concentrated HNO3
[B] by mixing 3 parts of concentrated HCl and one part of concentrated HNO3
[C] by mixing 1 part of concentrated HCl and three parts of concentrated HNO3
[D] None of the above

Show Answer

10. Which of the following is NOT correct about Phosphine?
[A] The chemical formula is PH3
[B] The electronic structure is like Ammonia
[C] It is odorless
[D] it is used as a dopant in semiconductor industries

Show Answer