Chemistry Practice Question and Answer
8 4 Q:
5ed5f57b5ccf7008ed8ca454 4 Q:
5ed8d0e4e4997750bdbabbef 4 Q:
5feb056c00e3f71b828c2206 4 Q:
5f742bd338027c5313ed6bc9 4 Q:
5feb034bf33a00432afeea62 4 Q:
5ed8d7d354f88e519fa2312f 4 Q:
5f86a83ddcf12a01a1418fb3 4 Q:
61275bc7dbe92e068b9111ff Answer : 3. "alkaline"
Q: What is the main raw material in glass?
2094 05ed5f57b5ccf7008ed8ca454
5ed5f57b5ccf7008ed8ca454- 1Copperfalse
- 2Zinkfalse
- 3Cadmiumfalse
- 4Silicatrue
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Answer : 4. "Silica"
Q: Impure camphor is purified by
2078 05ed8d0e4e4997750bdbabbef
5ed8d0e4e4997750bdbabbef- 1sublimationtrue
- 2fractional crystallizationfalse
- 3fractional distillationfalse
- 4steam distillationfalse
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Answer : 1. "sublimation"
Q: Approximate pH value of lemon juice?
1976 05feb056c00e3f71b828c2206
5feb056c00e3f71b828c2206- 110false
- 22.2true
- 312false
- 414false
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- SingleChoice
Answer : 2. "2.2"
Q: Crystallization is an example of
1976 05f742bd338027c5313ed6bc9
5f742bd338027c5313ed6bc9- 1Physical changetrue
- 2Chemical Transformationfalse
- 3Chemical reactionfalse
- 4Galvanizationfalse
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Answer : 1. "Physical change"
Q: A fermentation of grapes?
1969 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 role of a positive catalyst in a chemical reaction?
1967 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: The atomic mass of an element has the maximum number of electrons in its second orbit—
1947 05f86a83ddcf12a01a1418fb3
5f86a83ddcf12a01a1418fb3- 12false
- 28true
- 310false
- 416false
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Answer : 2. "8"
Q: The producers formed by the combustion of magnesium are -
1940 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'.
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