Discussion
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- Question
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
- Correct Answer
- 21
- 1. 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
- 2. 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
- 3. Which is the most economical method of removing solid matter from water?
Options- A. Using deactivated carbon
- B. Electrolysis
- C. Distillation
- D. Sedimentation Discuss
- 4. Which of the following is the best fire-extinguisher?
Options- A. Water
- B. Oxygen
- C. Carbon-dioxide
- D. Soil Discuss
- 5. 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
- 6. 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
- 7. The absolute zero is a temperature at which _______
Options- A. molecular motion in a gas would cease
- B. water freezes
- C. all gases become liquid
- D. all gases become solid Discuss
- 8. Isobars have _______.
Options- A. Same mass numbers but different atomic numbers
- B. Different mass numbers but same atomic numbers
- C. Same mass and atomic numbers
- D. Different mass and atomic numbers Discuss
- 9. Which among the following will be a negative ion?
Options- A. If it has more electrons than protons
- B. If it has more electrons than neutrons
- C. If it has more protons than electrons
- D. If it has more protons than neutrons Discuss
- 10. The elements known as primary nutrients for plants
Options- A. Nitrogen, Phosphorus and Potassium
- B. Nitrogen, Oxygen and Silicon
- C. Potassium, Boron and Nitrogen
- D. Nitrogen, Phosphorus and Iron Discuss
Chemistry problems
Search Results
Correct Answer: 24
Correct Answer: Physical Change
Correct Answer: Sedimentation
Correct Answer: Carbon-dioxide
Correct Answer: All I, II and III
Correct Answer: CH2ClF
Correct Answer: molecular motion in a gas would cease
Correct Answer: Same mass numbers but different atomic numbers
Correct Answer: If it has more electrons than protons
Correct Answer: Nitrogen, Phosphorus and Potassium
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