Chemistry Practice Question and Answer
8 Q: Gastric juice contains acids?
1289 05eeb136fbc81cb2528f1ed1b
5eeb136fbc81cb2528f1ed1b- 1Acetic acidfalse
- 2Sulfuric acidfalse
- 3Hydrochloric acidtrue
- 4Nitric acidfalse
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Answer : 3. "Hydrochloric acid"
Q: Which of the following is used as a lubricant in heavy machines?
4223 05f2cf764be9f31290fb85b15
5f2cf764be9f31290fb85b15- 1Phosphorusfalse
- 2Graphitetrue
- 3Bauxitefalse
- 4Sulphurfalse
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Answer : 2. "Graphite "
Q: What is the systematic name of PbO? 1677 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.
Q: The carbon tetrachloride molecule (CCl4) is 1912 05b5cc604e4d2b4197774b4e7
5b5cc604e4d2b4197774b4e7- 1a nonpolar molecule with polar bondstrue
- 2a nonpolar molecule with nonpolar bondsfalse
- 3a polar molecule with polar bondsfalse
- 4a polar molecule with nonploar bondsfalse
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Answer : 1. "a nonpolar molecule with polar bonds"
Explanation :
Answer: A) a nonpolar molecule with polar bonds Explanation: The four bonds of carbon tetrachloride (CCl4) are polar, but the molecule is nonpolar because the bond polarity is cancelled by the symmetric tetrahedral shape. Hence, making the net dipole as zero and molecule as non-polar. When other atoms substitute for some of the Cl atoms, the symmetry is broken and the molecule becomes polar.
Q: The gas used for artificial fruit ripening of green fruit is
1922 05ed634c2436d8a49583c72fa
5ed634c2436d8a49583c72fa- 1Ethanefalse
- 2Ethylenefalse
- 3Methanefalse
- 4Acetylenetrue
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Answer : 4. "Acetylene "
Q: The element common to all acids is 1469 05edeface2fce215c8ec3bc2f
5edeface2fce215c8ec3bc2f- 1oxygenfalse
- 2hydrogentrue
- 3carbonfalse
- 4sulphurfalse
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Answer : 2. "hydrogen"
Q: Used in removing permanent hardness of water?
1349 05eeb131bad25df5a632567d5
5eeb131bad25df5a632567d5- 1running sodatrue
- 2bleaching powderfalse
- 3Caustic sodafalse
- 4Baking Sodafalse
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Answer : 1. "running soda"
Q: The anode in a dry cell consists of
1140 05f2cf8de21de6a117aefee33
5f2cf8de21de6a117aefee33- 1Cadmiumfalse
- 2Graphitefalse
- 3Copperfalse
- 4Zinctrue
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