NTA JEE Main 26th August 2021 Shift 1 - Chemistry

NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 31

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Given below are two statements:
Statement I : According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in positive charges on the nucleus as there is no strong hold on the electron by the nucleus.
Statement II : According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in principle quantum number.
In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement I is false but Statement II is true

B

Statement I is true but Statement II is false

C

Both Statement I and Statement II are false

D

Both Statement I and Statement II are true

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 32

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Given below are two statements:
Statement I : In the titration between strong acid and weak base methyl orange is suitable as an indicator.
Statement II : For titration of acetic acid with NaOH phenolphthalein is not a suitable indicator.
In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement I is false but Statement II is true

B

Both Statement I and Statement II are true

C

Both Statement I and Statement II are false

D

Statement I is true but Statement II is false

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 33

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Which one of the following methods is most suitable for preparing deionized water?

A

Synthetic resin method

B

Calgon's method

C

Clark's method

D

Permutit method

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 34

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What are the products formed in sequence when excess of CO$$_2$$ is passed in slaked lime?

A

CaO, CaCO$$_3$$

B

Ca(HCO$$_3$$)$$_2$$, CaCO$$_3$$

C

CaCO$$_3$$, Ca(HCO$$_3$$)$$_2$$

D

CaO, Ca(HCO$$_3$$)$$_2$$

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 35

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The major product formed in the following reaction is:

A

B

C

D

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 36

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Excess of isobutane on reaction with Br$$_2$$ in presence of light at 125°C gives which one of the following, as the major product?

A

B

C

D

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 37

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Among the following compounds I - IV, which one forms a yellow precipitate on reacting sequentially with
(i) NaOH (ii) dil. HNO$$_3$$ (iii) AgNO$$_3$$

A

III

B

II

C

I

D

IV

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 38

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The conversion of hydroxyapatite occurs due to presence of F$$^-$$ ions in water. The correct formula of hydroxyapatite is:

A

$$[Ca_3(PO_4)_2 \cdot CaF_2]$$

B

$$[3Ca_3(PO_4)_2 \cdot Ca(OH)_2]$$

C

$$[3Ca_3(PO_4)_2 \cdot CaF_2]$$

D

$$[3Ca(OH)_2 \cdot CaF_2]$$

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 39

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Given below are two statements:
Statement I : Frenkel defects are vacancy as well as interstitial defects.
Statement II : Frenkel defect leads to colour in ionic solids due to presence of F-centres.
Choose the most appropriate answer for the statements from the options given below:

A

Statement I is false but Statement II is true

B

Both Statement I and Statement II are false

C

Statement I is true but Statement II is false

D

Both Statement I and Statement II are true

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 40

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Given below are two statements:
Statement I : The limiting molar conductivity of KCl (strong electrolyte) is higher compared to that of CH$$_3$$COOH (weak electrolyte).
Statement II : Molar conductivity decreases with decrease in concentration of electrolyte.
In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement I is false but Statement II is true

B

Both Statement I and Statement II are true

C

Statement I is true but Statement II is false

D

Both Statement I and Statement II are false

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 41

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Which one of the following is correct for the adsorption of a gas at a given temperature on a solid surface?

A

$$\Delta H > 0, \Delta S > 0$$

B

$$\Delta H < 0, \Delta S > 0$$

C

$$\Delta H > 0, \Delta S < 0$$

D

$$\Delta H < 0, \Delta S < 0$$

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 42

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Given below are two statements.
Statement I: The choice of reducing agents for metals extraction can be made by using the Ellingham diagram, a plot of $$\Delta G$$ vs temperature.
Statement II: The value of $$\Delta S$$ increases from left to right in the Ellingham diagram.
In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement I is false but Statement II is true

B

Both Statement I and Statement II are true

C

Statement I is true but Statement II is false

D

Both Statement I and Statement II are false

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 43

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The incorrect statement is:

A

$$F_2$$ is a stronger oxidizing agent than Cl$$_2$$ in aqueous solution.

B

On hydrolysis ClF forms HOCl and HF.

C

Cl$$_2$$ is more reactive than ClF.

D

$$F_2$$ is more reactive than ClF.

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 44

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Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?

A

Cu$$_2$$Cl$$_2$$

B

ZnCl$$_2$$

C

CuCl$$_2$$

D

AgCl

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 45

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Which one of the following complexes is violet in colour?

A

Fe$$_4$$[Fe(CN)$$_6$$]$$_3$$ $$\cdot$$ H$$_2$$O

B

[Fe(CN)$$_5$$NOS]$$^{4-}$$

C

[Fe(SCN)$$_6$$]$$^{4-}$$

D

[Fe(CN)$$_6$$]$$^{4-}$$

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 46

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The correct options for the products A and B of the following reactions are:

A

B

C

D

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 47

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The major products formed in the following reaction sequence A and B are:

A

B

C

D

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 48

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The major product formed in the following reaction is:

A

B

C

D

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 49

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The correct sequential addition of reagents in the preparation of 3-nitrobenzoic acid from benzene is:

A

Br$$_2$$/AlBr$$_3$$, HNO$$_3$$/H$$_2$$SO$$_4$$, Mg/ether, CO$$_2$$, H$$_3$$O$$^+$$

B

Br$$_2$$/AlBr$$_3$$, NaCN, H$$_3$$O$$^+$$, HNO$$_3$$/H$$_2$$SO$$_4$$

C

Br$$_2$$/AlBr$$_3$$, HNO$$_3$$/H$$_2$$SO$$_4$$, NaCN, H$$_3$$O$$^+$$

D

HNO$$_3$$/H$$_2$$SO$$_4$$, Br$$_2$$/AlBr$$_3$$, Mg/ether, CO$$_2$$, H$$_3$$O$$^+$$

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 50

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The polymer formed on heating Novolac with formaldehyde is:

A

Polyester

B

Bakelite

C

Nylon-6,6

D

Melamine

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 51

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An aqueous KCl solution of density 1.20 g mL$$^{-1}$$ has a molality of 3.30 mol kg$$^{-1}$$. The molarity of the solution in mol L$$^{-1}$$ is _________ (The Nearest integer)
[Molar mass of KCl = 74.5 g]

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 52

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AB$$_3$$ is an interhalogen T-shaped molecule. The number of lone pairs of electrons on A is _________ (Integer answer)

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 53

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The Born-Haber cycle for KCl is evaluated with the following data:
$$\Delta_f H^{\ominus}$$ for KCl = $$-436.7$$ kJ mol$$^{-1}$$; $$\Delta_{sub} H^{\ominus}$$ for K = 89.2 kJ mol$$^{-1}$$;
$$\Delta_{ionization} H^{\ominus}$$ for K = 419.0 kJ mol$$^{-1}$$; $$\Delta_{electron gain} H^{\ominus}$$ for Cl$$_{(g)}$$ = $$-348.6$$ kJ mol$$^{-1}$$
$$\Delta_{bond} H^{\ominus}$$ for Cl$$_2$$ = 243.0 kJ mol$$^{-1}$$
The magnitude of lattice enthalpy of KCl in kJ mol$$^{-1}$$ is _________ (Nearest integer)

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 54

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The OH$$^-$$ concentration in a mixture of 5.0 mL of 0.0504 M NH$$_4$$Cl and 2 mL of 0.0210 M NH$$_3$$ solution is $$x \times 10^{-6}$$ M. The value of $$x$$ is _________ (Nearest integer) [Given $$K_w = 1 \times 10^{-14}$$ and $$K_b = 1.8 \times 10^{-5}$$]

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 55

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The ratio of number of water molecules in Mohr's salt and potash alum is _________ $$\times 10^{-1}$$. (Integer answer)

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 56

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Of the following four aqueous solutions, the total number of those solutions whose freezing point is lower than that of 0.10 M C$$_2$$H$$_5$$OH is _________ (Integer answer)
(i) 0.10 M Ba$$_3$$(PO$$_4$$)$$_2$$
(ii) 0.10 M Na$$_2$$SO$$_4$$
(iii) 0.10 M KCl
(iv) 0.10 M Li$$_3$$PO$$_4$$

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 57

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These are physical properties of an element:
(A) Sublimation enthalpy
(B) Ionisation enthalpy
(C) Hydration enthalpy
(D) Electron gain enthalpy
The total number of above properties that affect the reduction potential is _________ (Integer answer)

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 58

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The following data was obtained for chemical reaction given below at 975 K.
$$2NO_{(g)} + 2H_{2(g)} \rightarrow N_{2(g)} + 2H_2O_{(g)}$$
[NO] = 8 $$\times 10^{-5}$$, [H$$_2$$] = 8 $$\times 10^{-5}$$, Rate = 7 $$\times 10^{-9}$$
[NO] = 24 $$\times 10^{-5}$$, [H$$_2$$] = 8 $$\times 10^{-5}$$, Rate = 2.1 $$\times 10^{-8}$$
[NO] = 24 $$\times 10^{-5}$$, [H$$_2$$] = 32 $$\times 10^{-5}$$, Rate = 8.4 $$\times 10^{-8}$$
The order of the reaction with respect to NO is _________ [Integer answer]

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 59

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The number of 4f electrons in the ground state electronic configuration of Gd$$^{2+}$$ is _________ [Atomic number of Gd = 64]

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NTA JEE Main 26th August 2021 Shift 1 - Chemistry - Question 60

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The total number of negative charge in the tetrapeptide, Gly-Glu-Asp-Tyr, at pH 12.5 will be _________ (Integer answer)

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