Chemistry Practice Question and Answer
8 Q: Which of the following is not correct about diffusion?
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5f869edfb7ad805e26c102b6- 1The rate of diffusion of gases is higher than that of solid and liquid.false
- 2Diffusion is possible only when the particles of matter are in constant motion.false
- 3The rate of diffusion of gases depends on their volume.true
- 4Particles in diffusion move from high concentration to low concentration.false
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Answer : 3. "The rate of diffusion of gases depends on their volume."
Q: In which process is a protective zinc coating applied on iron to prevent it from rusting?
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60927508cc29175f0f879192- 1Galvanisationtrue
- 2Annealingfalse
- 3Smeltingfalse
- 4Weldingfalse
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Answer : 1. "Galvanisation"
Q: The litmus dye is purple in color, which is removed?
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5f697e9cf9079a64e3a51e91- 1Redfalse
- 2Lichentrue
- 3Cabbage Turmericfalse
- 4Petunia flowerfalse
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Answer : 2. "Lichen"
Q: A catalyst is a substance that_________ the velocity of a chemical reaction.
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5f7560fbc995cb2bd58dca56- 1Increasesfalse
- 2Decreasesfalse
- 3Changestrue
- 4None of thesefalse
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Answer : 3. "Changes"
Q: Which metal does not react with oxygen even at high temperature?
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612759fb302e8b067c99a4be- 1Ironfalse
- 2goldtrue
- 3Potassiumfalse
- 4Aluminumfalse
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Answer : 2. "gold"
Q: Which gas is produced when the dilute acids are reacted with metals?
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5f6c2b8fec13dd7480fadce1- 1Hydrogentrue
- 2nitrogenfalse
- 3Carbon dioxidefalse
- 4Oxygenfalse
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Answer : 1. "Hydrogen"
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 gas is known as 'noble gas' ?
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5ef2f5457c1ec61320b14d6b- 1Heliumtrue
- 2Carbon dioxidesfalse
- 3Hydrogenfalse
- 4Oxygenfalse
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