Chemistry GK Practice Question and Answer
8 Q: Which metal can be cut with a knife among sodium, lithium, calcium and nickel?
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61275c2293f02206607ea973- 1Sodiumtrue
- 2Lithiumfalse
- 3calciumfalse
- 4allfalse
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Answer : 1. "Sodium"
Explanation :
Alkali metals (lithium, sodium, potassium) are so soft that they can be cut with a knife. The freshly cut surface is a shiny, silver colour, but this tarnishes quickly to a dull grey as the metal reacts with oxygen and water in the air.
Q: Which of the following is the softest?
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5eeb1496eee45c3b837b0312- 1Sodiumtrue
- 2Copperfalse
- 3Ironfalse
- 4Aluminumfalse
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Answer : 1. "Sodium"
Q: Which of the following metals can be cut with a knife?
1517 05feb06f200e3f71b828c287a
5feb06f200e3f71b828c287a- 1Magnesiumfalse
- 2Sulfurfalse
- 3Sodiumtrue
- 4Chromiumfalse
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Answer : 3. "Sodium"
Q: Used in removing permanent hardness of water?
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5eeb131bad25df5a632567d5- 1running sodatrue
- 2bleaching powderfalse
- 3Caustic sodafalse
- 4Baking Sodafalse
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Answer : 1. "running soda"
Q: Which of the following will be a negative ion?
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650ab26a63078e50a28c8adb- 1If it has more electrons than protonsfalse
- 2If it has more electrons than neutronstrue
- 3If it has more protons than electronsfalse
- 4If it has more protons than neutronsfalse
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Answer : 2. "If it has more electrons than neutrons"
Explanation :
If an atom has more electrons than protons, it is a negative ion or anion. If it has more protons than electrons, it is a positive ion.
Q: Which of the following properties is not often present in organic compounds?
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6127662693f02206607f017f- 1soluble in watertrue
- 2low melting pointfalse
- 3flammabilityfalse
- 4allfalse
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Answer : 1. "soluble in water"
Q: Thin wires can be pulled from a metal piece. For which property of the metal is it responsible?
1424 05feb0909f33a00432aff0fc3
5feb0909f33a00432aff0fc3- 1Tensiletrue
- 2hardnessfalse
- 3Malignancyfalse
- 4conductivityfalse
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Answer : 1. "Tensile"
Q: What is the pH value of sodium hydroxide?
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5f697aa5397b1a52908bfe4f- 111false
- 212false
- 313false
- 414true
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