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- Question
The mass number of an isotope of an element is 298. If its nucleus has 189 neutrons, what is its atomic number?
Options- A. 298
- B. 189
- C. 109
- D. 487
- Correct Answer
- 109
- 1. Give an example of a salt which gives an aqueous solution of pH less than 7.
Options- A. Ammonium chloride
- B. Sodium carbonate
- C. Sodium bicarbonate
- D. Sodium chloride Discuss
- 2. The atoms of Germanium, Arsenic, Selenium and Bromine contain ...... shells.
Options- A. 3
- B. 7
- C. 5
- D. 4 Discuss
- 3. The electronic dot and cross structure of ethene is ............
Options- A. A)
- B. B)
- C. C)
- D. D) Discuss
- 4. The force that a neutron exerts on a proton inside an atom is:
Options- A. Tidal force
- B. Gravitational force
- C. Electrostatic force
- D. Nuclear force Discuss
- 5. Which of the following molecules is joined by a double covalent bond?
Options- A. Cl2
- B. O2
- C. N2
- D. He2 Discuss
- 6. ......... is a deliquescent compound.
Options- A. Quick lime
- B. Sulphuric acid
- C. Phosphorous pentoxide
- D. Magnesium chloride Discuss
- 7. ........... is not a sub atomic particle of an atom.
Options- A. Neutron
- B. Electron
- C. Xenon
- D. Proton Discuss
- 8. How many elements are present in the group of the 18th Modem Periodic Table?
Options- A. 5
- B. 2
- C. 6
- D. 7 Discuss
- 9. Which among the following is an example of solid sol?
Options- A. Milk of magnesia
- B. Foam
- C. Coloured gemstones
- D. Rubber Discuss
- 10. Which metal is responsible for Itai-Itai disease?
Options- A. Cadmium
- B. Nickel
- C. Chromium
- D. Mercury Discuss
Chemistry problems
Search Results
Correct Answer: Ammonium chloride
Correct Answer: 4
Correct Answer: C)
Correct Answer: Nuclear force
Correct Answer: O2
Correct Answer: Magnesium chloride
Correct Answer: Xenon
Correct Answer: 7
Correct Answer: Coloured gemstones
Correct Answer: Cadmium
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