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- Question
The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is
Options- A. helium
- B. ozone
- C. oxygen
- D. methane
- Correct Answer
- ozone
- 1. The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is
Options- A. 1.568 x 103
- B. 6.023 x 1019
- C. 4.84 x 1017
- D. 6.023 x 1023 Discuss
- 2. The maximum number of covalent formed by nitrogen is
Options- A. 1
- B. 2
- C. 3
- D. 4 Discuss
- 3. The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is
Options- A. cineole
- B. engenol
- C. geraniol
- D. limonene Discuss
- 4. The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of
Options- A. atomic structure
- B. metallurgy
- C. periodic table of contents
- D. discovery of elements Discuss
- 5. The gas used in the manufacture of vanaspati from vegetable oil is
Options- A. hydrogen
- B. oxygen
- C. nitrogen
- D. carbon dioxide Discuss
- 6. The nucleus of an atom consists of
Options- A. electrons and neutrons
- B. electrons and protons
- C. protons and neutrons
- D. All of the above Discuss
- 7. The metal that is used as a catalyst in the hydrogenation of oils is
Options- A. Ni
- B. Pb
- C. Cu
- D. Pt Discuss
- 8. The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of
Options- A. an addition reaction
- B. a condensation reaction
- C. an oxidation reaction
- D. an elimination reaction Discuss
- 9. The mineral containing both magnesium and calcium is
Options- A. magnesite
- B. calcite
- C. carnallite
- D. dolomite Discuss
- 10. The graphite rods in the nuclear reactor
Options- A. react with U to release energy
- B. produce neutrons
- C. undergo combustion which triggers the nuclear fission
- D. convert fast moving neutrons into thermal neutrons Discuss
Chemistry problems
Search Results
Correct Answer: 6.023 x 1019
Correct Answer: 4
Correct Answer: cineole
Correct Answer: periodic table of contents
Correct Answer: hydrogen
Correct Answer: protons and neutrons
Correct Answer: Ni
Correct Answer: a condensation reaction
Correct Answer: dolomite
Correct Answer: convert fast moving neutrons into thermal neutrons
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