CBSE 12TH CHEMISTRY - Online Test
Q1. The compound [Cr(H2O)6]Cl3 and [Cr(H2O)4Cl2]Cl.2H2O represent
Answer : Option B
Explaination / Solution:
There is exchange of 4H_2O$ molecules inside and outside the coordination sphere.
Q2. Scum formation can be prevented by
Answer : Option D
Explaination / Solution:
Scum formation happens in hard water. It ca be avoided by adding water softners or by using detergents.
Q3. How much electricity in terms of Faraday is required to produce 40.0 g of Al from molten ?
Answer : Option C
Explaination / Solution:
Moles of Al= 40/27. For 1 mol of Al deposition 3F charge is required.
Q4. Dichloromethane (Methylene chloride) is
Answer : Option B
Explaination / Solution:
CHCl2 is organic solvent
Q5. The ionic reactions are generally very fast because
Answer : Option B
Explaination / Solution:
Ionic reactions does not involve bond breaking therefore they are fast.
Q6. Which of the following processes does not involve a catalyst?
Answer : Option A
Explaination / Solution:
Thermite process doesn’t require a catalyst.
Q7. RNA guides the biosynthesis of
Answer : Option D
Explaination / Solution:
RNA guides the biosynthesis of proteins.
Q8. Ketones are reduced to the corresponding alcohols by catalytic hydrogenation to form
Answer : Option D
Explaination / Solution:
Carboxylic acids, esters, and acid halides can be reduced to either aldehydes or a step further to primary alcohols, depending on the strength of the reducing agent; aldehydes and ketones can be reduced respectively to primary and secondary alcohols.
Q9. Ethylene glycol is added to water as antifreeze. It will
Answer : Option B
Explaination / Solution:
Fact.
Q10. When pyridine is treated with a mixture of nitric and sulfuric acids, the major product is:
Answer : Option B
Explaination / Solution:
In pyridine EAS take splace at 3 position.
