Discussion
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- Question
The melting point of ice is ____ K.
Options- A. 253.16
- B. 263.16
- C. 273.16
- D. 283.16
- Correct Answer
- 273.16
- 1. ________ is made by mixing iron with carbon and metals like chromium, nickel and manganese.
Options- A. Ship
- B. Stainless Steel
- C. Rust
- D. Ozone Discuss
- 2. Which of the following is not an example of Allotrope?
Options- A. Diamond
- B. Graphite
- C. Ozone
- D. Steel Discuss
- 3. What is the maximum number of states of matter?
Options- A. Three
- B. Four
- C. Five
- D. Variable Discuss
- 4. What is the number of atoms in 46 g of sodium-23 (N = Avogadro constant)?
Options- A. N/2
- B. N
- C. 2N
- D. 23 N Discuss
- 5. There are two elements-calcium (atomic number 20) and argon (atomic number 18). The mass number of both the elements is 40. They are therefore known as
Options- A. isotones
- B. isochores
- C. isobars
- D. isotopes Discuss
- 6. Brownish film formed on iron when left in open is called?
Options- A. Dust
- B. Shovel
- C. Spade
- D. Rust Discuss
- 7. Which of the following can be beaten and converted into thin sheets?
Options- A. Zinc
- B. Phosphorus
- C. Sulphur
- D. Oxygen Discuss
- 8. 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
- 9. 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
- 10. Which of the following is the best fire-extinguisher?
Options- A. Water
- B. Oxygen
- C. Carbon-dioxide
- D. Soil Discuss
Chemistry problems
Search Results
Correct Answer: Stainless Steel
Correct Answer: Steel
Correct Answer: Five
Explanation:
There are five known states of matter: solids, liquids, gases, plasma and Bose-Einstein condensates. The main difference in the structures of each state is in the densities of the particles.
Correct Answer: 2N
Explanation:
Number of atoms in 46 grams of sodium - 23 will be 2N.
Correct Answer: isobars
Explanation:
Isotopes-These are atoms of the elements having the same atomic number but different mass number., Isobars-These are atoms of same mass number but different atomic number., Isotones-These are atoms of different elements having same number of neutrons.
Correct Answer: Rust
Correct Answer: Zinc
Correct Answer: N2O
Correct Answer: All I, II and III
Correct Answer: Carbon-dioxide
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