Chemistry Practice Question and Answer
8 4 Q:
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6576edf47274ac7b5885d375 Answer : 3. "Ethanol + carbon dioxide + energy"
Q: Why do we boil the extract with conc. HNO3 in Lassaigne’s test for halogens?
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63c8f9528731ac33279f0648- 1To increase the concentration of NO3- ionsfalse
- 2To increase the solubility product of AgClfalse
- 3It increases the precipitation of AgClfalse
- 4For the decomposition of Na2S AND NaCN formedtrue
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Answer : 4. "For the decomposition of Na2S AND NaCN formed"
Q: HCl is an Arrhenius ___________
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63c7aabfb338bc336f08c023- 1Acidtrue
- 2Basefalse
- 3Saltfalse
- 4Waterfalse
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Answer : 1. "Acid"
Q: Which of the following is not a lewis acid?
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63c7a61fbdbddb32fd9cc85f- 1aluminum chloridefalse
- 2sodium ionfalse
- 3Sulphur tetrafluoridefalse
- 4hydroxide iontrue
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Answer : 4. "hydroxide ion"
Q:Read the following questions carefully and answer them.
The advantage of detergents over soaps is
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63aaa809afa10611461dc17d- 1Detergents are soluble in waterfalse
- 2Detergents could not give much latherfalse
- 3Detergents give lather even with hard watertrue
- 4Soaps give lather with only soft waterfalse
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Answer : 3. "Detergents give lather even with hard water "
Q: Which fibre is used for making bristles of brushes.
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6389b84734f83f147273cfcb- 1Kevlarfalse
- 2Nylon-66true
- 3Terylenefalse
- 4Lexanfalse
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Answer : 2. "Nylon-66"
Q: Which of the following is considered to be the fifth state of matter?
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64242bd8dcb650c14569c06c- 1Bose-Einstein condensatetrue
- 2Plasmafalse
- 3Solidfalse
- 4Gasfalse
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Answer : 1. "Bose-Einstein condensate "
Q:Read the following questions carefully and answer them.
Cloud is a colloidal dispersion of
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63aaa9205770eb565d50124f- 1Air in a dispersion medium of waterfalse
- 2Fog in a dispersion medium of waterfalse
- 3Mist in a dispersion medium of airfalse
- 4Water drops in a dispersion medium of airtrue
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Answer : 4. "Water drops in a dispersion medium of air"
Q: Which of the following products are formed during anaerobic respiration in yeast?
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6576edf47274ac7b5885d375- 1Acetic acid + energyfalse
- 2Lactic acid + carbon dioxide + energyfalse
- 3Ethanol + carbon dioxide + energytrue
- 4Lactic acid + energyfalse
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Answer : 3. "Ethanol + carbon dioxide + energy"
Explanation :
1. Yeast breaks down glucose, producing ethanol and carbon dioxide and energy.
2. Yeast reacts anaerobically.
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