Chemistry problems
- 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
Correct Answer: 6.023 x 1019
- 2. 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 Discuss
Correct Answer: ozone
- 3. 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
Correct Answer: protons and neutrons
- 4. The metal that is used as a catalyst in the hydrogenation of oils is
Options- A. Ni
- B. Pb
- C. Cu
- D. Pt Discuss
Correct Answer: Ni
- 5. 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
Correct Answer: a condensation reaction
- 6. The mineral containing both magnesium and calcium is
Options- A. magnesite
- B. calcite
- C. carnallite
- D. dolomite Discuss
Correct Answer: dolomite
- 7. 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
Correct Answer: convert fast moving neutrons into thermal neutrons
- 8. The molecules of which gas have highest speed?
Options- A. H2 at -73oC
- B. CH4 at 300 K
- C. N2 at 1,027oC
- D. O2 at 0oC Discuss
Correct Answer: H2 at -73oC
- 9. The number of g-molecule of oxygen in 6.02 x 1024CO molecules is
Options- A. 1 gram of molecule
- B. 0.5 gram of molecule
- C. 5 gram of molecule
- D. 10 gram of molecule Discuss
Correct Answer: 5 gram of molecule
- 10. The main buffer system of the human blood is
Options- A. H2CO3 - HCO3
- B. H2CO3 - CO32-
- C. CH3COOH - CH3COO-
- D. NH2CONH2 - NH2CONH+ Discuss
Correct Answer: H2CO3 - HCO3
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