Chemistry Practice Question and Answer
8 4 Q:
62ac7aa2184ea83a6380a6d9 4 Q:
62cd637951fe3472d6b30512 4 Q:
63c8f9528731ac33279f0648 4 Q:
63c7c0321e8e3f3e1a35f224 4 Q:
63c7b87a7efeed32fc1cb907 4 Q:
63c7aabfb338bc336f08c023 4 Q:
6389c01134f83f1472741741 4 Q:
63aaa6fc5770eb565d4ff628
Q: Which of the following is/are the example/examples of chemical change?
(1) . Crystallization of sodium chloride
(2) . Melting of ice
(3) . Souring of milk
Select the correct answer using the code given below.
905 062ac7aa2184ea83a6380a6d9
62ac7aa2184ea83a6380a6d9- 13 onlytrue
- 21, 2 and 3false
- 31 and 2 onlyfalse
- 4Nonefalse
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Answer : 1. "3 only "
Q: The common name of dichlorodifluoromethane is _____.
905 062cd637951fe3472d6b30512
62cd637951fe3472d6b30512- 1gypsumfalse
- 2boraxfalse
- 3galenafalse
- 4Freontrue
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Answer : 4. "Freon"
Q: Why do we boil the extract with conc. HNO3 in Lassaigne’s test for halogens?
901 063c8f9528731ac33279f0648
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: Identify a conjugate pair in the equation:
NH3 + H2O ⇌ NH4+ + OH–.
896 063c7c0321e8e3f3e1a35f224
63c7c0321e8e3f3e1a35f224NH3 + H2O ⇌ NH4+ + OH–.
- 1Ammonia and waterfalse
- 2Water and hydroxide iontrue
- 3Ammonium ion and hydroxide ion.false
- 4Ammonia and hydroxide ionfalse
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Answer : 2. "Water and hydroxide ion"
Q: Which of the following substances cannot act as both acid as well as a base?
879 063c7b87a7efeed32fc1cb907
63c7b87a7efeed32fc1cb907- 1Amphoteric substancefalse
- 2Amphiprotic substancefalse
- 3Ampholytefalse
- 4Photophilictrue
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Answer : 4. "Photophilic"
Q: HCl is an Arrhenius ___________
873 063c7aabfb338bc336f08c023
63c7aabfb338bc336f08c023- 1Acidtrue
- 2Basefalse
- 3Saltfalse
- 4Waterfalse
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Answer : 1. "Acid"
Q: Plastic bottles are made of a polymer called PET. The expanded form of PET is
870 06389c01134f83f1472741741
6389c01134f83f1472741741- 1Polyethylene terephthalatetrue
- 2Polyethyl Terelenefalse
- 3Polyethylene triphosphatefalse
- 4Polyethyl tetrachloridefalse
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Answer : 1. "Polyethylene terephthalate"
Q:Read the following questions carefully and answer them.
“All the four quantum numbers of two electrons in an atom are not the same.” It is the law of —
870 063aaa6fc5770eb565d4ff628
63aaa6fc5770eb565d4ff628- 1Hund’sfalse
- 2Exclusion Principle of Paulitrue
- 3Uncertainty Principle of Heisenbergfalse
- 4Avogadro’s Lawfalse
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Answer : 2. " Exclusion Principle of Pauli "
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