CBSE 12TH CHEMISTRY - Online Test
Q1. An aqueous solution of methanol and water has vapour pressure
Answer : Option A
Explaination / Solution:
They show positive deviation.
Q2. Pyridine typically undergoes________ electrophilic aromatic substitution as compared to benzene,
Answer : Option D
Explaination / Solution:
Pyridine is less reactive than benzene towards electrophilic aromatic substitution, because nitrogen is more electronegative than carbon and acts like an electron withdrawing group.
Q3. The distillation process is used for the purification of
Answer : Option B
Explaination / Solution:
Hg is purified by distillation.
Q4. In XeO3 and XeF6 the oxidation state of Xe is
Answer : Option C
Explaination / Solution:
Xe is oxidation state of +6.
Q5. The property of a substance to offer no resistance to the flow of electricity at a particular temperature is known as
Answer : Option D
Explaination / Solution:
Superconductors offers no resistance to flow electricity.
Q6. Natural rubber is
Answer : Option D
Explaination / Solution:
Natural Rubber is polyisoprene.
Q7. Lucas reagent is
Answer : Option D
Explaination / Solution:
Lucas Test is done to distinguish primary secondary and tertiary alcohols. Lucas reagent is ZnCl2+ HCl
Q8. Which of the following statements is not correct?
Answer : Option C
Explaination / Solution:
Aldehydes and ketones have polar C=O group therefore they undergo nucleophilic addition reactions.
Q9. Which of the following complexes can form d and l isomers?
Answer : Option B
Explaination / Solution:
Cis −− [Co(en)2Cl2]+ exist as non superimposable mirror image.
Q10. In seasonal rhinitis and conjunctivitis, the drugs administered are
Answer : Option D
Explaination / Solution:
Anti-histamine is given to treat seasonal rhinitis and conjunctivitis.
