Chemistry Practice Question and Answer
8 Q: What is the main raw material in glass?
2278 05ed5f57b5ccf7008ed8ca454
5ed5f57b5ccf7008ed8ca454- 1Copperfalse
- 2Zinkfalse
- 3Cadmiumfalse
- 4Silicatrue
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Answer : 4. "Silica"
Q: Approximate pH value of lemon juice?
2271 05feb056c00e3f71b828c2206
5feb056c00e3f71b828c2206- 110false
- 22.2true
- 312false
- 414false
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Answer : 2. "2.2"
Q: Which of these metals is found in liquid state?
2239 061275cd493f02206607eb0af
61275cd493f02206607eb0af- 1Ironfalse
- 2Mercurytrue
- 3Silverfalse
- 4Othersfalse
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Answer : 2. "Mercury"
Explanation :
Mercury is the only metal that is liquid at normal temperatures.
Q: Impure camphor is purified by
2234 05ed8d0e4e4997750bdbabbef
5ed8d0e4e4997750bdbabbef- 1sublimationtrue
- 2fractional crystallizationfalse
- 3fractional distillationfalse
- 4steam distillationfalse
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Answer : 1. "sublimation"
Q: The producers formed by the combustion of magnesium are -
2209 061275bc7dbe92e068b9111ff
61275bc7dbe92e068b9111ff- 1is acidicfalse
- 2is indifferentfalse
- 3alkalinetrue
- 4allfalse
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Answer : 3. "alkaline"
Explanation :
Therefore, the correct option is (C) Magnesium ribbon on burning in air produces: 'Magnesium oxide, heat and light'.
Q: What is the role of a positive catalyst in a chemical reaction?
2208 05ed8d7d354f88e519fa2312f
5ed8d7d354f88e519fa2312f- 1It increases the rate of reactiontrue
- 2It decreases the rate of reactionfalse
- 3It increases the yield of the productsfalse
- 4It provides better purity of the productsfalse
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Answer : 1. "It increases the rate of reaction "
Q: A fermentation of grapes?
2183 05feb034bf33a00432afeea62
5feb034bf33a00432afeea62- 1chemical change istrue
- 2physical changefalse
- 3Both chemical and physical changesfalse
- 4Othersfalse
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Answer : 1. "chemical change is"
Q: What is the systematic name of PbO? 2166 05b5cc5ffe4d2b4197774b412
5b5cc5ffe4d2b4197774b412- 1Plumbic oxidefalse
- 2Lead oxidefalse
- 3Lead(II) oxidetrue
- 4All of the abovefalse
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Answer : 3. "Lead(II) oxide"
Explanation :
Answer: C) Lead(II) oxide Explanation: The systematic name for a chemical is the unique name given to it by the International Union of Pure Applied Chemistry (IUPAC). The IUPAC name can differ from a chemical compound's general name. PbO is an ionic compound since it consists of a Lead as metal and Oxygen as nonmetal. The systematic name for PbO is Lead (II) oxide. Here we need to put the (II) since lead has more than one combining capacity.