CBSE 12TH CHEMISTRY - Online Test
Q1. Which chromium compound is widely used in tanning of leather?
Q2. Which of the following is correct?
Answer : Option C
Explaination / Solution:
C2H5OH get oxidizes to CH3CHO and –COCH3 group is important for iodoform.
Q3. The kind of isomerism exhibited by [Rh(en)2Cl2][Ir(en)Cl4] and [Ir(en)3][RhCl6] is
Answer : Option D
Explaination / Solution:
There is exchange of ligands between the cationic and anion species in coordination sphere.
Q4. To increase the storage life of butter, the ingredient added is
Answer : Option B
Explaination / Solution:
BHT is added to increase the storage life of butter.
Q5. How much charge is required for the reduction of 1 mol of to Al?
Answer : Option B
Explaination / Solution:
For reduction of 1 mol of to Al , 3 mol of electrons are required so total charge will be 3F.
Q6. Tetrachloromethane (Carbon tetrachloride)is
Answer : Option B
Explaination / Solution:
CCl4 is degreasing agent.
Q7. Which among the following is an example of pseudo first order reaction?
Answer : Option C
Explaination / Solution:
In acid catalysed hydrolysis of ethylacetate the water is in excess so it is pseudo 1st order reaction, as cincentraton does not change.
Q8. When adsorption of oxalic acid is carried out on activated charcoal, then activated charcoal is known as
Answer : Option C
Explaination / Solution:
Surface on which adsorption occurs is known as adsorbent.
Q9. The enzyme which catalyses the hydrolysis of fats into fatty acids and glycerol is.
Answer : Option C
Explaination / Solution:
Lipase catalyse hydrolysis of fats into fatty acids and glycerol.
Q10. The compound formed as a result of oxidation of ethyl benzene by KMnO4 is
Answer : Option B
Explaination / Solution:
Oxidation of aromatic alkanes with KMnO4 to give carboxylic acids. Description: Treatment of an alkylbenzene with potassium permanganate results in oxidation to give the benzoic acid.
