CBSE 12TH CHEMISTRY - Online Test
Q1. Liquid – liquid solutions are known as
Answer : Option D
Explaination / Solution:
Dispersed phase and dispersion medium both are liquids.
Q2. The cyclic form of fructose is called
Answer : Option A
Explaination / Solution:
Cyclic form of fructose is called furanose.
Q3. In Q 14, the catalyst used is not one of the following
Answer : Option C
Explaination / Solution:
Ag cannot act as catalyst.
Q4. p – toluenesulphonyl chloride is used to
Answer : Option C
Explaination / Solution:
p – toluenesulphonyl chloride can also be used to distinguish between , and amines in replacement of benzenesulphonylchloride.
Q5. The sum of all mole fraction for a mixture is always equal to
Answer : Option A
Explaination / Solution:
Q6. Polymerisation can be obtained by
Answer : Option A
Explaination / Solution:
Polymerisation involves Chain growth Mechanism and also condensation.
Q7. What is the spontaneous ignition temperature of white phosphorous?
Answer : Option A
Explaination / Solution:
Ignition temperature of white phosphorus is 35 oC
Q8. Which process is usually applied for separating gangue from sulphide ores?
Answer : Option A
Explaination / Solution:
Sulphide ores are concentrated using Froth floatation.
Q9. Zinc carbonate is precipitated from zinc sulphate solution by the addition of
Answer : Option C
Explaination / Solution:
Q10. The oxidation of toluene to benzoic acid can be stopped at the aldehyde stage. The reaction is called
Answer : Option A
Explaination / Solution:
Etard is specific reaction for conversion of toluene to Benzaldehyde.
