Discussion
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- Question
Which of the following is the best fire-extinguisher?
Options- A. Water
- B. Oxygen
- C. Carbon-dioxide
- D. Soil
- Correct Answer
- Carbon-dioxide
- 1. Which of the following statements are CORRECT? I. Melamine is a Thermo setting plastic. II. It resists fire. III It is a poor conductor of heat.
Options- A. Only I and II
- B. Only I and III
- C. Only II and III
- D. All I, II and III Discuss
- 2. Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?
Options- A. N2O
- B. AsH3
- C. N2
- D. C5H12 Discuss
- 3. Which of the following can be beaten and converted into thin sheets?
Options- A. Zinc
- B. Phosphorus
- C. Sulphur
- D. Oxygen Discuss
- 4. Brownish film formed on iron when left in open is called?
Options- A. Dust
- B. Shovel
- C. Spade
- D. Rust Discuss
- 5. The melting point of ice is ____ K.
Options- A. 253.16
- B. 263.16
- C. 273.16
- D. 283.16 Discuss
- 6. Which is the most economical method of removing solid matter from water?
Options- A. Using deactivated carbon
- B. Electrolysis
- C. Distillation
- D. Sedimentation Discuss
- 7. A change in which a substance undergoes a change in its physical properties is called _____________.
Options- A. Chemical Properties
- B. Physical Properties
- C. Chemical Change
- D. Physical Change Discuss
- 8. Fe has 26 protons in its nucleus. What are the number of electrons in Fe2+ (II) ion?
Options- A. 24
- B. 26
- C. 28
- D. 13 Discuss
- 9. The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 3rd group and the 4th period?
Options- A. 23
- B. 21
- C. 19
- D. 11 Discuss
- 10. Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?
Options- A. CH2ClF
- B. C2H2
- C. PF5
- D. COCl2 Discuss
Chemistry problems
Search Results
Correct Answer: All I, II and III
Correct Answer: N2O
Correct Answer: Zinc
Correct Answer: Rust
Correct Answer: 273.16
Correct Answer: Sedimentation
Correct Answer: Physical Change
Correct Answer: 24
Correct Answer: 21
Correct Answer: CH2ClF
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