CBSE 12TH CHEMISTRY - Online Test
Q1. Which polymers occur naturally in nature
Answer : Option C
Explaination / Solution:
Starch and cellulose occur naturally.
Q2.
is the structure of
is the structure of
Answer : Option D
Explaination / Solution:
This structure is of H3PO4 . (Orthophosphoric acid). It has three P-OH and one P=O bonds.
Q3. The impurity that is added externally to remove the impurity already present in the ore is known as
Answer : Option D
Explaination / Solution:
Flux combines with impurities to form Slag which is easily separable.
Q4. Which of the following sublimes on heating?
Answer : Option A
Explaination / Solution:
HgCl2 sublimes on heating.
Q5. Benzene gets converted to benzaldehyde by Gatterman – Koch reaction. The appropriate reagent for the conversion is
Answer : Option B
Explaination / Solution:
Q6. Dettol is a mixture of
Answer : Option B
Explaination / Solution:
Dettol is mixture of chloroxylenol and terpineol.
Q7. In which of the following compounds, the metal is in the lowest oxidation state?
Answer : Option A
Explaination / Solution:
CO is neutral so Mn has zero oxidation state.
Q8. According to Faraday’s First Law of ElectrolysisThe amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the
Answer : Option B
Explaination / Solution:
Faraday’s first law of electrolysis states that amount of substance deposited at any of the electrode is directly proportional to amount of charge passed.
Q9. Upon oxidation, one of the following halogen containing compounds forms an extremely poisonous gas – – + O2 → 2 COCl2 + 2HCl
Answer : Option C
Explaination / Solution:
CHCl3 on reaction with oxygen forms phosgene. Chloroform
decomposes when it exposed to sunlight.it decomposes to a harmful gas
phosgene(COCl2) Chloroform decomposes when it exposed to sunlight.it decomposes to a harmful gas phosgene(COCl2)
Q10.
The rate of chemical reaction becomes double for every 10o rise in temperature because of
Answer : Option A
Explaination / Solution:
With increase in temperature molecular collisions increases therefore rate of reaction doubles.
