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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The following acids have been arranged in order of decreasing acid strength. Identify the correct order:

\( ( I ). Cl ( OH )\)

\( (II). Br ( OH )\)

\((III). I ( OH )\)

A
\(I>II>III\)

B
\(II>I>III\)

C
\(III>II>I\)

D
\(I>III>II\)

Question 2

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Match List-I with List-II

	List-I (Molecule)		List-II (Bond order)
A.	Ne₂	(i)	1
B.	N₂	(ii)	2
C.	F₂	(iii)	0
D.	O₂	(iv)	3

Choose the correct answer from the options given below.

A

(A-iii), (B-iv), (C-i), (D-ii)

B

(A-i), (B-ii), (C-iii), (D-iv)

C

(A-ii), (B-i), (C-iv), (D-iii)

D

(A-iv), (B-iii), (C-ii), (D-i)

Question 3
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A catalyst is added to a reaction to increase the rate of reaction. Which of the following statements is correct?

A
A catalyst increases the activation energy between reactants and products and hence, lowers the potential energy barrier.

B
A catalyst provides an alternate pathway or reaction mechanism.

C
A catalyst alters G, Gibbs energy of reaction.

D
A catalyst changes the equilibrium constant of a reaction.

Question 4
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Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid state?

A
\({Ag}_{2} {SO}_{4}\)

B
\(C u F_{2}\)

C
\(Z n F_{2}\)

D
\({Cu}_{2} {Cl}_{2}\)

Question 5
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A well-stoppered thermos flask contains some ice cubes. This is an example of:

A
Closed system

B
Open system

C
Isolated system

D
Non-thermodynamics system

Question 6
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The functional group present in organic, acid is –

A
–COOH

B
– OH

C
– CHO

D
> C = O

Question 7
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Transition metal compounds are usually coloured. This is due to the electronic transition:

A
from p orbital to s-orbital

B
from \(\mathrm{d}\) orbital to s-orbitals

C
from d orbital to p-orbital

D
within the d-orbitals

Question 8
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Which statement is correct?

A
Fumaric acid is stronger than Maleic acid

B
Maleic acid is stronger than fumaric acid

C
Both (A) and (B)

D
None of the above

Question 9
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NH₃ and BF₃ Form an adduct readily because they from:

A
A coordinate bond

B
A covalent bond

C
An ionic bond

D
A hydrogen bond

Question 10
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The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statements is NOT correct?

A
Magnesium Chloride solution coagulates gold sol readily than iron (III) hydroxide sol.

B
Sodium sulphate solution causes coagulation in both sols.

C
Mixing of two sols has no effect.

D
Coagulation in both sols can be brought about by electrophoresis.

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