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

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Question 1
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Which of the following has highest ionisation enthalpy?

A
Nitrogen

B
Phosphorus

C
Oxygen

D
Sulphur

Question 2
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Metal M ions form accp structure. Oxide ions occupy \(\frac12\) octahedral and \(\frac12\) tetrahedral voids. What is the formula of the oxide?

A
MO

B
M\(O_2\)

C
M\(O_3\)

D
\(M_2O_3\)

Question 3
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The reaction of toluene with \(Cl_2\) in presence of Fe\(Cl_3\) gives ‘X’ while theof toluene with \(Cl_2\) in presence of light gives ‘Y’. Thus ‘X’ and ‘Y’are:

A
X = benzyl chloride Y = o and p – chlorotoluene

B
X = m – chlorotoluene Y = p – chlorotoluene

C
X = o and p–chlorotoluene Y = trichloromethylbenzene

D
X= benzyl chloride, Y = m-chlorotoluene

Question 4
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Ozone is a/ an __________ molecule and the two O-O bond lengths in ozone are (i)_______-and (ii) ____________.

A
linear ,110pm ; 148pm

B
angular, 110pm ; 148pm

C
linear, 128pm ; 128pm

D
angular, 128pm ; 128pm

Question 5
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Water retention or puffiness due to high salt intake occurs due to:

A
diffusion

B
vapour pressure difference

C
osmosis

D
reverse osmosis

Question 6
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In lake test for \(Al^{3+}\) ions, there is the formation of coloured ‘floating lake’. It is due to:

A
Absorption of litmus by\( [Al(OH)_4]^ -\)

B
Absorption of litmus by \(Al(OH)_3\)

C
Adsorption of litmus by \([Al(OH)4]^-\)

D
Adsorption of litmus by \(Al(OH)_3\)

Question 7
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A unit cell of NaCl has 4 formula units. Its edge length is 0.50 nm. Calculate the density if molar mass of NaCl = 58.5 g/mol.

A
1 g/\(cm^3\)

B
2 g/\(cm^3\)

C
3 g/\(cm^3\)

D
4g/\(cm^3\)

Question 8
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Which one of the following are correctly arranged on the basis of the property indicated:

A
\(I_2<Br_2<F_2<Cl_2\) [increasing bond dissociation enthalpy]

B
\(H_2O > H_2S<H_2Te<H_2Se\) [increasing acidic strength]

C
\(NH_3 < N_2O< NH_2OH<N_2O_5\) [ increasing oxidation state]

D
\(BiH_3<SbH_3<AsH_3<PH_3<NH_3\) [ increasing bondangle]

Question 9
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Which of the following statements is true:

A
Ammonia is the weakest reducing agent and the strongest base among Group 15 hydrides.

B
Ammonia is the strongest reducing agent as well as the strongest base among Group 15 hydrides.

C
Ammonia is the weakest reducing agent as well as the weakest base among Group 15 hydrides.

D
Ammonia is the strongest reducing agent and the weakest base among Group 15 hydrides.

Question 10
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Alkenes decolourise bromine water in presence of \(CCl_4\) due to formation of:

A
allyl bromide

B
vinyl bromide

C
bromoform

D
vicinal dibromide

Question 11
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Assertion (A): Electron gain enthlpy of oxygen is less than that of Flourine but greater than Nitrogen.

Reason (R): Ionisation enthalpies of the elements follow the order Nitrogen > Oxygen > Fluorine.

A
Both A and R are true and R is the correct explanation of A

B
Both A and R are true but R is not the correct explanation of A.

C
A is true but R is false.

D
A is true but R is false.

Question 12
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Assertion (A): Alkyl halides are insoluble in water.

Reason (R): Alkyl halides have halogen attached to \(sp^3\) hybrid carbon. Select the most appropriate answer from the options given below:

A
Both A and R are true and R is the correct explanation of A

B
Both A and R are true but R is not the correct explanation of A.

C
A is true but R is false.

D
A is false but R is true.

Question 13
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Assertion(A): Molarity of a solution changes with temperature.

Reason (R): Molarity is a colligative property.

A
Both A and R are true and R is the correct explanation of A

B
Both A and R are true but R is not the correct explanation of A.

C
A is true but R is false.

D
A is false but R is true.

Question 14
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Assertion(A): \(SO_2\) is reducing while \(TeO_2\) is an oxidising agent.

Reason(R): Reducing property of dioxide decreases from \(SO_2\) to \(TeO_2\).

A
Both A and R are true and R is the correct explanation of A

B
Both A and R are true but R is not the correct explanation of A.

C
A is true but R is false

D
A is false but R is true.

Question 15
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Assertion (A):Cryoscopic constant depends on nature of solvent.

Reason(R ):Cryoscopic constant is a universal constant.

A
Both A and R are true and R is the correct explanation of A

B
Both A and R are true but R is not the correct explanation of A.

C
A is true but R is false.

D
A is false but R is true.

Question 16

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Match the following:

I	II
(i)Amino acids	(A)protein
(ii)Thymine	(B)Nucleic acid
(iii)Insulin	(C)DNA
(iv)phosphodiester linkage	(D)Zwitter ion
(v) Uracil

Which of the following is the best matched options?

A

i-A, v- D, iii- C, iv-B

B

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

C

i-D, v- D, iii- A, iv-B

D

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

Question 17
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Which of the following analogies is correct:

A
Nitrogen: \(1s^2 2s^2 2p^3 :: Argon:1s^2 2s^2 2p^6\)

B
Carbon: maximum compounds :: Xenon: no compounds

C
\(XeF_2\) : Linear :: \(ClF_3\) : Trigonal planar

D
Helium: meteorological observations:: Argon: metallurgical processes

Question 18
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Complete the following analogy:

Same molecular formula but different structures: A:: Non superimposable mirror images: B

A
A:Isomers B: Enantiomer

B
A: Enantiomers B: Racemic mixture

C
A: Sterioisomers B: Retention

D
A: Isomers B: Sterioisomers

Question 19
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The radius of \(Ag^+\) ion is 126 pm and of \(I^-\) ion is 216pm. The coordination number of \(Ag^+\) ion is:

A
2

B
3

C
6

D
8

Question 20
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A solid AB has square planar structure. If the radius of cation is 120 pm, calculate the maximum possible value of anion

A
240 pm

B
270 pm

C
280 pm

D
290 pm

Question 21
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A “good fit” is considered to be one where the cation can touch:

A
all of its nearest neighbour anions.

B
most of its nearest neighbour anions.

C
some of its nearest neighbour anions.

D
none of its nearest neighbour anions.

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