NTA JEE Main 9th January 2019 Shift 1 - Chemistry

NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 31

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For emission line of atomic hydrogen from $$n_i = 8$$ to $$n_f = n$$, the plot of wave number $$\bar{\nu}$$ against $$\frac{1}{n^2}$$ will be: (The Rydberg constant, $$R_H$$ is in wave number unit)

A

Linear with slope $$-R_H$$

B

Non linear

C

Linear with slope $$R_H$$

D

Linear with intercept $$-R_H$$

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 32

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In general, the properties that decrease and increase down a group in the periodic table, respectively, are:

A

Atomic radius and electronegativity

B

Electronegativity and atomic radius

C

Electronegativity and electron gain enthalpy

D

Electron gain enthalpy and electronegativity

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 33

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Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in +1 and +3 oxidation states. This is due to:

A

Diagonal relationship

B

Lattice effect

C

Lanthanoid contraction

D

Inert pair effect

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 34

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According to molecular orbital theory, which of the following is true with respect to $$Li_2^+$$ and $$Li_2^-$$?

A

$$Li_2^+$$ is stable and $$Li_2^-$$ is unstable

B

Both are unstable

C

Both are stable

D

$$Li_2^+$$ is unstable and $$Li_2^-$$ is stable

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 35

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0.5 moles of gas A and x moles of gas B exert a pressure of 200 Pa in a container of volume 10 m$$^3$$ at 1000 K. Given, R is the gas constant in JK$$^{-1}$$mol$$^{-1}$$, x is:

A

$$\frac{4 + R}{2R}$$

B

$$\frac{2R}{4 + R}$$

C

$$\frac{4 - R}{2R}$$

D

$$\frac{2R}{4 - R}$$

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 36

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Consider the reversible isothermal expansion of an ideal gas in a closed system at two different temperatures $$T_1$$ and $$T_2$$ ($$T_1 < T_2$$). The correct graphical depiction of the dependence of work done $$w$$ vs the final volume $$V$$ is:

A

B

C

D

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 37

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20 ml of 0.1 M $$H_2SO_4$$ solution is added to 30 mL of 0.2 M $$NH_4OH$$ solution. The pH of the resultant mixture is: ($$pK_b$$ of $$NH_4OH = 4.7$$)

A

5.0

B

5.2

C

9.4

D

9.0

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 38

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The isotopes of hydrogen are:

A

Protium, deuterium and tritium

B

Tritium and protium only

C

Protium and deuterium only

D

Deuterium and tritium only

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 39

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The alkaline earth metal nitrate that does not crystallise with molecules is:

A

$$Ba(NO_3)_2$$

B

$$Sr(NO_3)_2$$

C

$$Mg(NO_3)_2$$

D

$$Ca(NO_3)_2$$

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 40

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Correct statements among regarding silicones are:
(a) They are polymers with hydrophobic character.
(b) They are biocompatible.
(c) In general, they have high thermal stability and low dielectric strength.
(d) Usually, they are resistant to oxidation and used as greases.

A

(a), (b) and (c) only

B

(a) and (b) only

C

(a), (b), (c) and (d)

D

(a), (b) and (d) only

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 41

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Arrange the following amines in the decreasing order of basicity.

A

III > I > II

B

I > III > II

C

III > II > I

D

I > II > III

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 42

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Which amongst the following is the strongest acid?

A

$$CHCN_3$$

B

$$CHI_3$$

C

$$CHBr_3$$

D

$$CHCl_3$$

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 43

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The compounds A and B in the following reaction are, respectively:

A

A = Benzyl alcohol, B = Benzyl isocyanide

B

A = Benzyl chloride, B = Benzyl isocyanide

C

A = Benzyl alcohol, B = Benzyl cyanide

D

A = Benzyl chloride, B = Benzyl cyanide

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 44

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A water sample has ppm level concentration of the following metals: Fe = 0.2; Mn = 5.0; Cu = 3.0; Zn = 5.0. The metal that makes the water sample unsuitable for drinking is:

A

Zn

B

Fe

C

Mn

D

Cu

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 45

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The one that is extensively used as a piezoelectric material is:

A

Tridymite

B

Quartz

C

Amorphous silica

D

Mica

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 46

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A solution of sodium sulphate contains 92 g of Na$$^+$$ ions per kilogram of water. The molality of Na$$^+$$ ions in that solution in mol kg$$^{-1}$$ is:

A

16

B

4

C

12

D

8

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 47

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Which one of the following statements regarding Henry's law is not correct?

A

Different gases have different $$K_H$$ (Henry's law constant) values at the same temperature

B

The partial pressure of the gas in vapour phase is proportional to the mole fraction of the gas in the solution

C

Higher the value of $$K_H$$ at a given pressure, higher is the solubility of the gas in the liquids

D

The value of $$K_H$$ increases with increase of temperature and $$K_H$$ is function of the nature of the gas

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 48

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The anodic half-cell of lead-acid battery is recharged using electricity of 0.05 Faraday. The amount of $$PbSO_4$$ electrolyzed in g during the process is: (Molar mass of $$PbSO_4 = 303$$ g mol$$^{-1}$$)

A

22.8

B

15.2

C

11.4

D

7.6

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 49

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The following results were obtained during kinetic studies of the reaction.
$$2A + B \rightarrow$$ product

Experiment I: A = 0.10 mol L$$^{-1}$$, B = 0.20 mol L$$^{-1}$$, Rate = $$6.93 \times 10^{-3}$$ mol L$$^{-1}$$ min$$^{-1}$$
Experiment II: A = 0.10 mol L$$^{-1}$$, B = 0.25 mol L$$^{-1}$$, Rate = $$6.93 \times 10^{-3}$$ mol L$$^{-1}$$ min$$^{-1}$$
Experiment III: A = 0.20 mol L$$^{-1}$$, B = 0.30 mol L$$^{-1}$$, Rate = $$1.386 \times 10^{-2}$$ mol L$$^{-1}$$ min$$^{-1}$$

The time (in minutes) required to consume half of A is:

A

100

B

10

C

5

D

1

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 50

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Adsorption of a gas follows Freundlich adsorption isotherm. In the given plot, $$x$$ is the mass of the gas adsorbed on mass $$m$$ of the adsorbent at pressure P. $$\frac{x}{m}$$ is proportional to:

A

$$p^{\frac{1}{4}}$$

B

$$p$$

C

$$p^2$$

D

$$p^{\frac{1}{2}}$$

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 51

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The ore that contains both iron and copper is:

A

Azurite

B

Malachite

C

Dolomite

D

Copper pyrites

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 52

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The major product of the following reaction is:

A

$$RCOOH$$

B

$$RCHO$$

C

$$RCH_2NH_2$$

D

$$RCONH_2$$

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 53

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Two complexes $$[CrH_2O)_6]Cl_3$$ (A) and $$[Cr(NH_3)_6]Cl_3$$ (B) are violet and yellow coloured, respectively. The incorrect statement regarding them is:

A

Both are paramagnetic with three unpaired electrons

B

$$\Delta_0$$ value of A is less than that of B

C

$$\Delta_0$$ values of A and B are calculated from the energies violet and yellow light, respectively.

D

Both absorb energies corresponding to their complementary colors.

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 54

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In the reaction given below what will be the major product at the end:

Options:

A

B

C

D

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 55

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Major product of the given reaction is:

Options:

A

B

C

D

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 56

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The highest value of the calculated spin only magnetic moment (in BM) among all the transition metal complexes is:

A

4.90 BM

B

3.87 BM

C

6.93 BM

D

5.92 BM

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 57

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Acid strength given below the correct decreasing order will be:

A

$$NO_2CH_2COOH > FCH_2COOH > CNCH_2COOH > ClCH_2COOH$$

B

$$FCH_2COOH > NCCH_2COOH > NO_2CH_2COOH > ClCH_2COOH$$

C

$$CNCH_2COOH > O_2NCH_2COOH > FCH_2COOH > ClCH_2COOH$$

D

$$O_2NCH_2COOH > FCH_2COOH > ClCH_2COOH > NCCH_2COOH$$

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 58

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Major product of the given below reaction:

Options:

A

B

C

D

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 59

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The correct match between column-I and column-II is:
Column-I (drug)              Column-II (test)
(A) Chloroxylenol           (P) Carbylamine test
(B) Norethindrone         (Q) Sodium hydrogen carbonate test
(C) Sulphapyridine        (R) Ferric chloride test
(D) Penicillin                  (S) Baeyer's test

A

A $$\rightarrow$$ R, B $$\rightarrow$$ P, C $$\rightarrow$$ S, D $$\rightarrow$$ Q

B

A $$\rightarrow$$ Q, B $$\rightarrow$$ S, C $$\rightarrow$$ P, D $$\rightarrow$$ R

C

A $$\rightarrow$$ Q, B $$\rightarrow$$ P, C $$\rightarrow$$ S, D $$\rightarrow$$ R

D

A $$\rightarrow$$ R, B $$\rightarrow$$ S, C $$\rightarrow$$ P, D $$\rightarrow$$ Q

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NTA JEE Main 9th January 2019 Shift 1 - Chemistry - Question 60

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The increasing order of pKa of the following amino acids in aqueous solution is: Glycine, Aspartate, Lysine, Arginine.

A

Arginine < Lysine < Glycine < Aspartate

B

Aspartate < Glycine < Arginine < Lysine

C

Glycine < Aspartate < Arginine < Lysine

D

Aspartate < Glycine < Lysine < Arginine

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