NTA JEE Main 3rd September 2020 Shift 2 - Chemistry

NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 26

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The strengths of 5.6 volume hydrogen peroxide (of density 1 g/mL) in terms of mass percentage and molarity(M) respectively, are: (Take molar mass of hydrogen peroxide as 34 g/mol)

A

1.7 and 0.5

B

0.85 and 0.25

C

1.7 and 0.25

D

0.85 and 0.5

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 27

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Consider the hypothetical situation where the azimuthal quantum number, $$\ell$$, takes values 0, 1, 2, ......... n + 1. Where n is the principal quantum number. Then, the element with atomic number:

A

9 is the first alkali metal

B

13 has a half-filled valence subshell

C

8 is the first noble gas

D

6 has a 2p-valence subshell

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 28

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The five successive ionization enthalpies of an element are 800, 2427, 3658, 35024, 32824 kJ mol$$^{-1}$$. The number of valence electrons in the element is:

A

5

B

4

C

3

D

2

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 29

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Consider the following molecules and statements related to them:

(a) (B) is more likely to be crystalline than (A)
(b) (B) has higher boiling point than (A)
(c) (B) dissolves more readily than (A) in water
Identify the correct option from below:

A

(a) and (b) are true

B

(a) and (c) are true

C

only (a) is true

D

(b) and (c) are true

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 30

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A mixture of one mole each of $$H_2$$, He and $$O_2$$ each are enclosed in a cylinder of volume V at temperature T. If the partial pressure of $$H_2$$ is 2 atm, the total pressure of the gases in the cylinder is:

A

6 atm

B

38 atm

C

14 atm

D

22 atm

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 31

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100 mL of 0.1 M HCl is taken in a beaker and to it 100 mL 0.1 M NaOH of is added in steps of 2 mL and the pH is continuously measured. Which of the following graphs correctly depicts the change in pH?

A

B

C

D

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 32

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Among the statements (I - IV), the correct ones are:
(I) Be has smaller atomic radius compared to Mg.
(II) Be has higher ionization enthalpy than Al.
(III) Charge/radius ratio of Be is greater than that of Al.
(IV) Both Be and Al form mainly covalent compounds

A

(I), (II) and (IV)

B

(I), (III) and (IV)

C

(II), (III) and (IV)

D

(I), (II) and (III)

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 33

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The incorrect statement(s) among (a) - (d) regarding acid rain is (are):
(a) It can corrode water pipes
(b) It can damage structures made up of stone.
(c) It cannot cause respiratory ailments in animals
(d) It is not harmful for trees

A

(a), (c) and (d)

B

(c) only

C

(a), (b) and (d)

D

(c) and (d)

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 34

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For the reaction $$2A + 3B + \frac{3}{2}C \to 3P$$, which statement is correct?

A

$$\frac{dn_A}{dt} = \frac{3}{2}\frac{dn_B}{dt} = \frac{3}{4}\frac{dn_C}{dt}$$

B

$$\frac{dn_A}{dt} = \frac{dn_B}{dt} = \frac{dn_C}{dt}$$

C

$$\frac{dn_A}{dt} = \frac{2}{3}\frac{dn_B}{dt} = \frac{4}{3}\frac{dn_C}{dt}$$

D

$$\frac{dn_A}{dt} = \frac{2}{3}\frac{dn_B}{dt} = \frac{3}{4}\frac{dn_C}{dt}$$

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 35

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The incorrect statement is:

A

Manganate and permanganate ions are tetrahedral

B

In manganate and permanganate ions, the $$\pi$$-bonding takes place by overlap of p-orbitals of oxygen and d-orbitals of manganese

C

Manganate and permanganate ions are paramagnetic

D

Manganate ion is green in colour and permanganate ion is purple in colour

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 36

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Complex A has a composition of $$H_{12}O_6Cl_3Cr$$. If the complex on treatment with conc. $$H_2SO_4$$ loses 13.5% of its original mass, the correct molecular formula of A is:
[Given: atomic mass of Cr = 52 amu and Cl = 35 amu]

A

$$[Cr(H_2O_6)]Cl_3$$

B

$$[Cr(H_2O)_3Cl_3] \cdot 3H_2O$$

C

$$[Cr(H_2O)_5Cl]Cl_2 \cdot H_2O$$

D

$$[Cr(H_2O)_4Cl_2]Cl \cdot 2H_2O$$

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 37

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The d-electron configuration of $$[Ru(en)_3]Cl_2$$, and $$[Fe(H_2O)_6]Cl_2$$ respectively are:

A

$$t_{2g}^6 e_g^0$$ and $$t_{2g}^6 e_g^0$$

B

$$t_{2g}^4 e_g^2$$ and $$t_{2g}^6 e_g^0$$

C

$$t_{2g}^6 e_g^0$$ and $$t_{2g}^4 e_g^2$$

D

$$t_{2g}^4 e_g^2$$ and $$t_{2g}^4 e_g^2$$

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 38

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The decreasing order of reactivity of the following compounds towards nucleophilic substitution ($$S_N2$$) is:

A

(II) > (III) > (I) > (IV)

B

(II) > (III) > (IV) > (I)

C

(III) > (II) > (IV) > (I)

D

(IV) > (II) > (III) > (I)

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 39

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The major product in the following reaction is:

A

B

C

D

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 40

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Consider the following reaction:

The product 'P' gives positive ceric ammonium nitrate test. This is because of the presence of which of these -OH group(s)?

A

(b) only

B

(c) and (d)

C

(d) only

D

(b) and (d)

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 41

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The increasing order of the reactivity of the following compounds in nucleophile addition reaction is:
Propanal, Benzaldehyde, Propanone, Butanone

A

Benzaldehyde > Butanone < Propanone < Propanal

B

Butanone < Propanone < Benzaldehyde < Propanal

C

Propanal < Propanone < Butanone < Benzaldehyde

D

Benzaldehyde < Propanal < Propanone < Butanone

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 42

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The compound A in the following reactions is:
$$A \xrightarrow[(ii)Conc. H_{2}SO_{4}/ \Delta]{(i)CH_{3}MgBr/H_{2}O} B \xrightarrow[(ii) Zn/H_{2}O]{(i) O_{3}} C + D$$

A

B

C

D

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 43

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Three isomers A, B and C (mol. formula $$C_8H_{11}N$$) give the following results:
A and C $$\xrightarrow{Diazotization}$$ P + Q $$\xrightarrow[(ii) acidation(KMnO_4+H^+)]{(i) Hydrolysis}$$ R (product of A) + S (product of C)
R has lower boiling point than S
B $$\xrightarrow{C_6H_5SO_2Cl}$$ alkali-insoluble product
A, B and C, respectively are:

A

B

C

D

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 44

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An ionic micelle is formed on the addition of:

A

liquid diethyl ether to aqueous NaCl solution

B

C

D

Sodium stearate to pure toluene

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 45

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Match the following drugs with their therapeutic actions:
(i) Ranitidine                                        (a) Antidepressant
(ii) Nardil (Phenelzine)                        (b) Antibiotic
(iii) Chloramphenicol                           (c) Antihistamine
(iv) Dimetane (Brompheniramine)   (d) Antacid
                                                                (e) Analgesic

A

(i)-(a); (ii)-(c); (iii)-(b); (iv)-(e)

B

(i)-(d); (ii)-(a); (iii)-(b); (iv)-(c)

C

(i)-(e); (ii)-(a); (iii)-(c); (iv)-(d)

D

(i)-(d); (ii)-(c); (iii)-(a); (iv)-(e)

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 46

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$$0.023 \times 10^{22}$$ molecules are present in 10g of a substance 'x'. The molarity of a solution containing 5g of substance 'x' in 2 L solution is _________ $$\times 10^{-3}$$

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 47

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If 250 cm$$^3$$ of an aqueous solution containing 0.73g of a protein A is isotonic with one litre of another aqueous solution containing 1.65g of a protein B, at 298K, the ratio of the molecular masses of A and B is _________ $$\times 10^{-2}$$ (to the nearest integer).

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 48

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An acidic solution of dichromate is electrolyzed for 8 minutes using 2 A current. As per the following equation $$Cr_2O_7^{2-} + 14H^+ + 6e^- \to 2Cr^{3+} + 7H_2O$$
The amount of $$Cr^{3+}$$ obtained was 0.104g. The efficiency of the process (in %) is (Take: F = 960000C, At. mass of chromium = 52)

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 49

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The volume (in mL) of 0.1 N NaOH required to neutralise 10 mL of 0.1 N phosphinic acid is __________.

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NTA JEE Main 3rd September 2020 Shift 2 - Chemistry - Question 50

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The number of 

groups present in a tripeptide Asp - Glu - Lys is ____

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