Chemistry-
General
Easy
Question
Point out the wrong statement :Physical adsorption is characterised by
- Attraction due to weak Vander Waal's forces
- Irreversible nature of adsorption
- Multimolecular adsorption layers
- Decrease in adsorption with increase in temperature
The correct answer is: Irreversible nature of adsorption
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A solid acts as an adsorbent because it has
A solid acts as an adsorbent because it has
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When the temperature is raised, the viscosity of liquid decreases, this is because
When the temperature is raised, the viscosity of liquid decreases, this is because
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If the absorbate is held on a surface by weak Vander Waal's forces, the absorption process is called
If the absorbate is held on a surface by weak Vander Waal's forces, the absorption process is called
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Wood charcoal is used to decolourise sugar because it
Wood charcoal is used to decolourise sugar because it
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Which among the following statement is false
Which among the following statement is false
Chemistry-General
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Chemisorption
Chemisorption
Chemistry-General
Chemistry-
Chemisorption
Chemisorption
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Chemistry-
Assertion:Galvanised iron does not rust.
Reason :Zinc has a more negative electrode potential than iron.
Assertion:Galvanised iron does not rust.
Reason :Zinc has a more negative electrode potential than iron.
Chemistry-General
Chemistry-
Assertion:Gold is recovered from its solution containing aurocynaide complex by adding zinc dust.
Reason:Zinc is more electropositive than gold.
Assertion:Gold is recovered from its solution containing aurocynaide complex by adding zinc dust.
Reason:Zinc is more electropositive than gold.
Chemistry-General
Chemistry-
Assertion:Lead, tin and bismuth are purified by liquation method.
Reason:Lead, tin and bismuth have low m.p. as compared to impurities.
Assertion:Lead, tin and bismuth are purified by liquation method.
Reason:Lead, tin and bismuth have low m.p. as compared to impurities.
Chemistry-General
Chemistry-
Assertion:Wolframite impurities are separated from cassiterite by electromagnetic separation.
Assertion:Wolframite impurities are separated from cassiterite by electromagnetic separation.
Chemistry-General
Chemistry-
Assertion:In Hall and Heroult's process, Al is extracted by electrolysis of a fused mixture of alumina, cryolite and fluorspar.
Reason:Addition of cryolite and fluorspar lowers the fusion temperature and increases the conductivity of the electrolyte.
Assertion:In Hall and Heroult's process, Al is extracted by electrolysis of a fused mixture of alumina, cryolite and fluorspar.
Reason:Addition of cryolite and fluorspar lowers the fusion temperature and increases the conductivity of the electrolyte.
Chemistry-General
Chemistry-
Assertion:Levigation is used for the separation of oxide ores from impurities.
Assertion:Levigation is used for the separation of oxide ores from impurities.
Chemistry-General
Chemistry-
Assertion:Leaching is a process of reduction.
Reason:Leaching involves treatment of the ore with a suitable reagent so as to make it soluble while impurities remains insoluble.
Assertion:Leaching is a process of reduction.
Reason:Leaching involves treatment of the ore with a suitable reagent so as to make it soluble while impurities remains insoluble.
Chemistry-General
Chemistry-
Assertion:Coke and flux are used in smelting.
Reason:The phenomenon in which ore is mixed with suitable flux and coke is heated to fusion is known as smelting.
Assertion:Coke and flux are used in smelting.
Reason:The phenomenon in which ore is mixed with suitable flux and coke is heated to fusion is known as smelting.
Chemistry-General
