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- Question
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
- Correct Answer
- 2N
ExplanationNumber of atoms in 46 grams of sodium - 23 will be 2N. - 1. 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
- 2. Which one of the following is a physical change?
Options- A. Burning of coal
- B. Burning of wood
- C. Heating of a platinum crucible
- D. Heating of potassium chlorate Discuss
- 3. Which among the following is not an example of emulsion?
Options- A. Chocolate-Milk
- B. Butter
- C. Whipped Cream
- D. Curd Discuss
- 4.
Options- A. Mineral
- B. Tribe
- C. Grass
- D. Town Discuss
- 5. Which of the following is an Inert Gas?
Options- A. Hydrogen
- B. Nitrogen
- C. Oxygen
- D. Argon Discuss
- 6. What is the maximum number of states of matter?
Options- A. Three
- B. Four
- C. Five
- D. Variable Discuss
- 7. Which of the following is not an example of Allotrope?
Options- A. Diamond
- B. Graphite
- C. Ozone
- D. Steel Discuss
- 8. ________ 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
- 9. The melting point of ice is ____ K.
Options- A. 253.16
- B. 263.16
- C. 273.16
- D. 283.16 Discuss
- 10. Brownish film formed on iron when left in open is called?
Options- A. Dust
- B. Shovel
- C. Spade
- D. Rust Discuss
Chemistry problems
Search Results
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: Heating of a platinum crucible
Explanation:
In Burning of coal, burning of wood and Heating of Potassium Chlorate there will be some sort of chemical change, but Heating of a Platinum crucible is a physical change.
Correct Answer: Curd
Correct Answer: Grass
Correct Answer: Argon
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: Steel
Correct Answer: Stainless Steel
Correct Answer: 273.16
Correct Answer: Rust
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