Chemistry problems
- 2. There are ............ metalloids in the modern periodic table.
Options- A. 5
- B. 4
- C. 7
- D. 6 Also asked in: CAT, Bank Exams, AIEEE
Correct Answer: 6
- 3. Which is the only non-metal placed at the left side of the Modern Periodic Table?
Options- A. Hydrogen
- B. Carbon
- C. Neon
- D. Helium Also asked in: CAT, Bank Exams, AIEEE
Correct Answer: Hydrogen
- 4. Calculate the relative molecular mass of water H2O ?
Options- A. 18u
- B. 1.8u
- C. 2.0u
- D. 20u Also asked in: AIEEE, Bank Exams, CAT
Correct Answer: 18u
- 5. A solution contains 33 g of common salt in 320 g of water. Calculate the concentration in terms of mass, by mass percentage of the solution.
Options- A. 13.05%
- B. 9.09 g
- C. 9.35g
- D. 9.35% Also asked in: AIEEE, Bank Exams, CAT
Correct Answer: 9.35%
- 6. Which of the following statements about the reaction below are INCORRECT? 2Pb + C ? 2Pb + CO2 A. Carbon di-oxide is getting, oxidised B. Lead is getting reduced C. Carbon is oxidised D. Lead oxide is getting reduced
Options- A. A and C
- B. A and B
- C. B and C
- D. A, B and C Also asked in: AIEEE, Bank Exams
Correct Answer: A and B
- 7. By which of the following processes are metals of high reactivity extracted from purified molten ore?
Options- A. Reduction by an appropriate reducing agent
- B. Roasting
- C. Electrolysis
- D. Calcination Also asked in: Bank Exams, AIEEE
Correct Answer: Electrolysis
- 8. Which of the follow is the last element in Newlands Law of Octaves classification?
Options- A. Rhodium
- B. Radium
- C. Iron
- D. Thorium Also asked in: CAT, Bank Exams, AIEEE
Correct Answer: Thorium
- 9. Rusting is _____.
Options- A. Electrolysis
- B. Oxidation
- C. Redox reaction (Oxidation and Reduction)
- D. Reduction Also asked in: Bank Exams
Correct Answer: Redox reaction (Oxidation and Reduction)
- 10. Which gas contributes most to the Greenhouse effect?
Options- A. Water vapour
- B. Ozone
- C. Oxygen
- D. Nitrogen Also asked in: Bank Exams, CAT
Correct Answer: Water vapour
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