Download CBSE Sample Paper 2024-25 for class 12th to 8th

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Chemistry Test ...

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Question 1

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Match List-I with List-II.

List-I	List-II
A. Sucrose	(i) β-D-galactose and β−D− glucose
B. Lactose	(ii) α-D-glucose and β-D-fructose
C. Maltose	(iii)α-D-glucose and α-D-glucose

Choose the correct answer from the options given below.

A

\(\mathrm{A} \rightarrow\) (i), \(\mathrm{B} \rightarrow\) (iii), \(\mathrm{C} \rightarrow\) (ii)

B

\(\mathrm{A} \rightarrow\) (ii), \(\mathrm{B} \rightarrow\) (i), \(\mathrm{C} \rightarrow\) (iii)

C

\(\mathrm{A} \rightarrow\) (ii), \(\mathrm{B} \rightarrow\) (i), \(\mathrm{C} \rightarrow\) (iii)

D

\(\mathrm{A} \rightarrow\) (iii), \(\mathrm{B} \rightarrow\) (ii), \(\mathrm{C} \rightarrow\) (i)

Question 2
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Which of the following is incorrect for primary amines?

A
On reaction with nitrous acid alkylamines produce alcohol

B
On reaction with nitrous acid arylamines produce phenol

C
Alkylamines are more basic than ammonia

D
Alkylamines are more basic than arylamines

Question 3
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Stephen's reduction converts ethane nitrile into:

A
Acetic Anhydride

B
Ethanal

C
Propanone

D
Ethyl carbylamine

Question 4
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Heavy water \((D_{2} O)\) freezes at:

A
\(-3.8^{\circ} C\)

B
\(3.8^{\circ} C\)

C
\(0^{\circ} C\)

D
\(38^{\circ} C\)

Question 5
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\(120 \mathrm{~g}\) of an organic compound that contains only carbon and hydrogen gives \(330 \mathrm{~g}\) of \(\mathrm{CO}_2\) and \(270 \mathrm{~g}\) of water on complete combustion. The percentage of carbon and hydrogen, respectively are

A
25 and 75

B
40 and 60

C
60 and 40

D
75 and 25

Question 6
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At equilibrium, if \({K}_{{p}}=1,\) then:

A
\(\Delta {G}^{\circ}>1\)

B
\(\Delta {G}^{\circ}<1\)

C
\(\Delta {G}^{\circ}=0\)

D
\(\Delta {G}^{\circ}=1\)

Question 7
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For a reaction, A(g)→A(l);∆H=−3RT. The correct statement for the reaction is:

A
∆H=∆U≠O

B
∆H=∆U=O

C
|∆H|<|∆U|

D
|∆H|>|∆U|

Question 8
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The pair from the following pairs having both compounds with net non-zero dipole moment is

A
cis-butene, trans-butene

B
Benzene, anisidine

C
\(\mathrm{CH}_2 \mathrm{Cl}_2, \mathrm{CHCl}_3\)

D
1,4-Dichlorohenzene, 1,3-Dichlorobenzene

Question 9
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The main product formed in the following reaction is:

A

B

C

D

Question 10
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In which of the following does sulphur has the lowest oxidation state?

A
\(\mathrm{H}_{2} \mathrm{SO}_{4}\)

B
\(\mathrm{SO}_{2}\)

C
\(\mathrm{H}_{2} \mathrm{SO}_{3}\)

D
\(\mathrm{H}_{2} \mathrm{S}\)

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