NTA JEE Main 31st August 2021 Shift 1 - Chemistry

NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 31

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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Metallic character decreases and non-metallic character increases on moving from left to right in a period.
Reason (R): It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy, when one moves from left to right in a period.
In the light of the above statements, choose the most appropriate answer from the options given below:

A

(A) is false but (R) is true.

B

Both (A) and (R) are correct and (R) is the correct explanation of (A)

C

Both (A) and (R) are correct but (R) is not the correct explanation of (A).

D

(A) is true but (R) is false.

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 32

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Which one of the following is the correct PV vs P plot at constant temperature for an ideal gas? (P and V stand for pressure and volume of the gas respectively)

A

B

C

D

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 33

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Monomer of Novolac is:

A

3-Hydroxybutanoic acid.

B

1, 3 -Butadiene and styrene.

C

phenol and melamine.

D

o-Hydroxymethylphenol.

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 34

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The major component/ingredient of Portland Cement is:

A

dicalcium silicate

B

tricalcium aluminate

C

dicalcium aluminate

D

tricalcium silicate

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 35

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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason.
Assertion (A): A simple distillation can be used to separate a mixture of propanol and propanone.
Reason (R): Two liquids with a difference of more than 20°C in their boiling points can be separated by simple distillations.
In the light of the above statements, choose the most appropriate answer from the options given below:

A

Both (A) and (R) are correct but (R) is not the correct explanation of (A).

B

Both (A) and (R) are correct and (R) is the correct explanation of (A).

C

(A) is true but (R) is false.

D

(A) is false but (R) is true.

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 36

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Choose the correct name for compound given below:

A

(2E)-2-Bromo-hex-4-yn-2-ene

B

(4E)-5-Bromo-hex-2-en-4-yne

C

(4E)-5-Bromo-hex-4-en-2-yne

D

(2E)-2-Bromohex-2-en-4-yne

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 37

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BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively as:

A

A < 5, B > 17

B

A > 50, B < 27

C

A > 15, B > 47

D

A > 25, B < 17

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 38

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Which one of the following 0.10 M aqueous solutions will exhibit the largest freezing point depression?

A

glycine

B

hydrazine

C

KHSO$$_4$$

D

glucose

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 39

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Select the graph that correctly describes the adsorption isotherms at two temperatures $$T_1$$ and $$T_2$$ ($$T_1 > T_2$$) for a gas:
($$x$$ - mass of the gas adsorbed, $$m$$ - mass of adsorbent, $$P$$ - pressure)

A

B

C

D

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 40

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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Treatment of bromine water with propene yields 1-bromopropan-2-ol.
Reason (R): Attack of water on bromonium ion follows Markovnikov rule and results in 1-bromopropan-2-ol.
In the light of the above statements, choose the most appropriate answer from the options given below:

A

Both (A) and (R) are true but (R) is NOT the correct explanation of (A).

B

(A) is false but (R) is true.

C

Both (A) and (R) are true and (R) is the correct explanation of (A).

D

(A) is true but (R) is false.

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 41

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In the structure of the dichromate ion, there is a:

A

linear symmetrical Cr - O - Cr bond.

B

non-linear unsymmetrical Cr - O - Cr bond.

C

non-linear symmetrical Cr - O - Cr bond.

D

linear unsymmetrical Cr - O - Cr bond.

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 42

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Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature? (Given Z for Nd = 60, Yb = 70, La = 57, Ce = 58)

A

Nd

B

Yb

C

Ce

D

La

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 43

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The denticity of an organic ligand, biuret is:

A

2

B

3

C

4

D

6

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 44

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The structure of product C, formed by the following sequence of reactions is:
CH$$_3$$COOH + SOCl$$_2$$ $$\rightarrow$$ A $$\xrightarrow[AlCl_{3}]{Benzene}$$ B $$\xrightarrow[OH]{KCN}$$ C

A

B

C

D

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 45

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The correct order of reactivity of the given chlorides with acetate in acetic acid is:

A

B

C

D

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 46

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Given below are two statements:
Statement I : The process of producing syn-gas is called gasification of coal.
Statement II : The composition of syn-gas is CO + CO$$_2$$ + H$$_2$$ (1 : 1 : 1).
In the light of the above statements, choose the most appropriate answer from the options given below:

A

Both Statement I and Statement II are false.

B

Statement I is true but Statement II is false

C

Statement I is false but Statement II is true.

D

Both Statement I and Statement II are true.

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 47

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The major products A and B in the following set of reactions are:

A

B

C

D

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 48

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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Aluminium is extracted from bauxite by the electrolysis of molten mixture of Al$$_2$$O$$_3$$ with cryolite.
Reason (R) : The oxidation state of Al in cryolite is +3.
In the light of the above statements, choose the most appropriate answer from the options given below:

A

Both (A) and (R) are correct and (R) is the correct explanation of (A).

B

(A) is true but (R) is false.

C

Both (A) and (R) are correct but (R) is not the correct explanation of (A).

D

(A) is false but (R) is true.

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 49

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The major product formed in the following reaction is:

A

B

C

D

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 50

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Which one of the following compounds contains $$\beta - C_1 - C_4$$ glycosidic linkage?

A

Sucrose

B

Amylose

C

Lactose

D

Maltose

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 51

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Ge (Z = 32) in its ground state electronic configuration has x completely filled orbitals with m$$_l$$ = 0. The value of x is _________.

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 52

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According to the following figure, the magnitude of the enthalpy change of the reaction A + B $$\rightarrow$$ M + N in kJ mol$$^{-1}$$ is equal to _________. (Integer answer)

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 53

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A$$_3$$B$$_2$$ is a sparingly soluble salt of molar mass M (g mol$$^{-1}$$) and solubility x g L$$^{-1}$$. The solubility product satisfies K$$_{sp}$$ = $$a\left(\frac{x}{M}\right)^5$$. The value of a is _________. (Integer answer)

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 54

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The number of hydrogen bonded water molecule(s) associated with stoichiometry CuSO$$_4$$.5H$$_2$$O is _________.

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 55

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The molarity of the solution prepared by dissolving 6.3 g of oxalic acid (H$$_2$$C$$_2$$O$$_4$$.2H$$_2$$O) in 250 mL of water in mol L$$^{-1}$$ is $$x \times 10^{-2}$$. The value of x is _________. (Nearest integer)
[Atomic mass : H : 1.0, C : 12.0, O : 16.0 J]

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 56

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Consider the following cell reaction Cd$$(s)$$ + Hg$$_2$$SO$$_4$$(s) + $$\frac{9}{5}$$H$$_2$$O$$(l)$$ $$\rightleftharpoons$$ CdSO$$_4$$.$$\frac{9}{5}$$H$$_2$$O$$(s)$$ + 2Hg$$(l)$$.
The value of E$$^0_{cell}$$ is 4.315 V at 25°C. If $$\Delta H°$$ = -825.2 kJ mol$$^{-1}$$, the standard entropy change $$\Delta S°$$ in J K$$^{-1}$$ is _________. (Nearest integer)
[Given : Faraday constant = 96487 C mol$$^{-1}$$]

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 57

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For a first order reaction, the ratio of the time for 75% completion of a reaction to the time for 50% completion is _________. (Integer answer)

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 58

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Consider the sulphides HgS, PbS, CuS, Sb$$_2$$S$$_3$$, As$$_2$$S$$_3$$ and CdS. Number of these sulphides soluble in 50% HNO$$_3$$ is _________.

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 59

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The number of halogen/(s) forming halic (V) acid is _________.

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NTA JEE Main 31st August 2021 Shift 1 - Chemistry - Question 60

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The total number of reagents from those given below, that can convert nitrobenzene into aniline is _________. (Integer answer)
I. Sn - HCl
II. Sn - NH$$_4$$OH
III. Fe - HCl
IV. Zn - HCl
V. H$$_2$$ - Pd
VI. H$$_2$$ - Raney Nickel

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