Chemistry Practice Question and Answer
8 Q: Gold is used to make jewelery?
982 061275c5e302e8b067c99c5ab
61275c5e302e8b067c99c5ab- 122 caratstrue
- 224 caratfalse
- 316 caratsfalse
- 423 caratsfalse
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Answer : 1. "22 carats"
Q: Which gas is deposited at the anode on electrolysis of alumina?
981 061275989dbe92e068b90f6be
61275989dbe92e068b90f6be- 1Hydrogen gasfalse
- 2Nitrogen gasfalse
- 3carbon dioxide gasfalse
- 4Oxygen gastrue
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Answer : 4. "Oxygen gas"
Q: Which of the following has low density and low melting point?
976 06082915b38ab470ae93bd9be
6082915b38ab470ae93bd9be- 1Natrue
- 2Fefalse
- 3Cufalse
- 4Aufalse
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Answer : 1. "Na"
Q: Which of the following products are formed during anaerobic respiration in yeast?
976 06576edf47274ac7b5885d375
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.
Q: Which of the following are strongly acidic?
972 05f697e6a397b1a52908c0aac
5f697e6a397b1a52908c0aac- 1pH = 7false
- 2pH = 14false
- 3pH = 0true
- 4pH = 3false
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Answer : 3. "pH = 0"
Q: Which is the most economical method of removing solid matter from water?
971 062de70c3313eb40eb89fc948
62de70c3313eb40eb89fc948- 1Using deactivated carbonfalse
- 2Electrolysisfalse
- 3Distillationfalse
- 4Sedimentationtrue
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Answer : 4. "Sedimentation"
Q: Solutions having the same osmotic pressure at a given temperature are called_____.
969 05fe9aa2500e3f71b8285e78f
5fe9aa2500e3f71b8285e78f- 1hypertonic solutionfalse
- 2hypotonic solutionfalse
- 3colloidal solutionfalse
- 4Isotonic solutiontrue
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Answer : 4. "Isotonic solution"
Q: In 1845, which German chemist published a method for the synthesis of acetic acid, a natural product containing two carbon atoms?
967 0649aa86b1a612ce001f66c19
649aa86b1a612ce001f66c19- 1Friedrich Wohlerfalse
- 2Marcellin Berthelotfalse
- 3Joseph Gay-Lussacfalse
- 4Hermann Kolbetrue
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Answer : 4. "Hermann Kolbe"
Explanation :
1. In 1845, the German chemist who published a method for the synthesis of 'acetic acid', a natural product containing two carbon atoms, was Hermann Kolbe.
2. He created carbon disulfide with chlorine, and the end result was carbon tetrachloride.