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- Question
The particle with 13 protons and 10 electrons is
Options- A. Al -atom
- B. Al3+ ion
- C. nitrogen isotope
- D. None of these
- Correct Answer
- Al3+ ion
- 1. Which of the following carbon compounds is used as a fire- extinguisher?
Options- A. Carbon disulphide
- B. Chloroform
- C. Carbon tetrachloride
- D. Methyl ene chloride Discuss
- 2. Van der Waal's equation explains the behaviour of _____
Options- A. Ideal gases
- B. Real gases
- C. Mixture of gases
- D. Diatomic gases Discuss
- 3. In photography, the compound of nitrogen used is
Options- A. Potassium nitrate
- B. Silver nitrate
- C. Ammonium carbonate
- D. Ammonium bicarbonate Discuss
- 4. Formation of cation occurs by
Options- A. gain of electron
- B. loss of electron
- C. gain of proton
- D. loss of proton Discuss
- 5. Natural radioactivity was discovered by
Options- A. Rutherford
- B. Becquerel
- C. Curie
- D. Schmidt Discuss
- 6. A device used for the measurement of radioactivity is
Options- A. mass spectrometer
- B. cyclotron
- C. nuclear reactor
- D. G.M.counter Discuss
- 7. Which one of the following is not radioactive
Options- A. Astanine
- B. Francium
- C. Tritium
- D. Zirconium Discuss
- 8. Permanent Hardness of water can be removed by adding
Options- A. Bleaching powder
- B. Chlorine
- C. Wasshing soda
- D. Potassium permanganate Discuss
- 9. The Most Important Ore of Aluminium is
Options- A. Calamine
- B. Monazite
- C. Magnetite
- D. Bauxite Discuss
- 10. Modern periodic table is based on atomic number of the elements. The significance of atomic number was proved by the experiment of ________
Options- A. Moseley's work on X-ray spectra
- B. Bragg's work on X-ray diffraction
- C. Mulliken's oil drop experiment
- D. Discovery of X-ray by Roentgen Discuss
Chemistry problems
Search Results
Correct Answer: Carbon tetrachloride
Explanation:
Vapour of carbon tetra chloride is non-inflammable and is heavier than air. Hence it is used as a fire extinguisher under the trade name of pyrene.
Correct Answer: Real gases
Correct Answer: Silver nitrate
Explanation:
Silver nitrate is the basic substance from which silver bromide is obtained. The photographic films are impregnated with the light sensitive AgBr.
Correct Answer: loss of electron
Correct Answer: Becquerel
Correct Answer: G.M.counter
Correct Answer: Zirconium
Correct Answer: Wasshing soda
Explanation:
Hardness can be removed by adding sodium carbonate (washing soda) or by passing the water through an ion-exchange column.
Hardness in water is caused by dissolved magnesium ions and calcium ions. These can get into the water when it comes into contact with limestone and other rocks that contain calcium compounds. This can happen, for example, when rainwater flows over these rocks on its way to a reservoir.
Hardness in water is of two types. They are :
1. Temporary hardness
2. Permanent hardness
1. Temporary hardness:: Temporary hardness is caused by dissolved calcium hydrogen carbonate.
2. Permanent hardness:: Permanent hardness is caused by dissolved calcium sulfate. Unlike temporary hardness, it is not removed by boiling the water.
Correct Answer: Bauxite
Correct Answer: Moseley's work on X-ray spectra
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