NTA JEE Main 12th April 2019 Shift 1 - Chemistry

NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 31

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5 moles of AB$$_2$$ weigh $$125 \times 10^{-3}$$ kg and 10 moles of A$$_2$$B$$_2$$ weigh $$300 \times 10^{-3}$$ kg. The molar mass of A (M$$_A$$) in kg mol$$^{-1}$$ are:

A

M$$_A$$ = $$5 \times 10^{-3}$$ and M$$_B$$ = $$10 \times 10^{-3}$$

B

M$$_A$$ = $$25 \times 10^{-3}$$ and M$$_B$$ = $$50 \times 10^{-3}$$

C

M$$_A$$ = $$50 \times 10^{-3}$$ and M$$_B$$ = $$25 \times 10^{-3}$$

D

M$$_A$$ = $$10 \times 10^{-3}$$ and M$$_B$$ = $$5 \times 10^{-3}$$

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 32

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The electrons are more likely to be found:

A

Only in the region a

B

In the region a and b

C

In the region a and c

D

Only in the region c

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 33

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The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:

A

15, 6 and 2

B

16, 6 and 3

C

16, 5 and 2

D

15, 5 and 3

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 34

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The correct statement among the following is:

A

$$(SiH_3)_3N$$ is planar and less basic than $$(CH_3)_3N$$

B

$$(SiH_3)_3N$$ is pyramidal and more basic than $$(CH_3)_3N$$

C

$$(SiH_3)_3N$$ is pyramidal and less basic than $$(CH_3)_3N$$

D

$$(SiH_3)_3N$$ is planar and more basic than $$(CH_3)_3N$$

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 35

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An ideal gas is allowed to expand from 1 L to 10 L against a constant external pressure of 1 bar. The work done in kJ is:

A

+10.0

B

-2.0

C

-0.9

D

-9.0

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 36

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Enthalpy of sublimation of iodine is 24 cal g$$^{-1}$$ at 200°C. If specific heat of I$$_2$$(s) and I$$_2$$(vap) are 0.055 and 0.031 cal g$$^{-1}$$ K$$^{-1}$$ respectively, then enthalpy of sublimation of iodine at 250°C in cal g$$^{-1}$$ is:

A

11.4

B

2.85

C

22.8

D

5.7

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 37

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What is the molar solubility of Al(OH)$$_3$$ in 0.2 M NaOH solution? Given that, solubility product of Al(OH)$$_3$$ = $$2.4 \times 10^{-24}$$:

A

$$3 \times 10^{-19}$$

B

$$12 \times 10^{-21}$$

C

$$12 \times 10^{-23}$$

D

$$3 \times 10^{-22}$$

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 38

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An example of a disproportionation reaction is

A

$$2KMnO_4 \to K_2MnO_4 + MnO_2 + O_2$$

B

$$2MnO_4^- + 10I^- + 16H^+ \to 2Mn^{2+} + 5I_2 + 8H_2O$$

C

2 CuBr $$\to$$ CuBr$$_2$$ + Cu

D

2 NaBr + Cl$$_2$$ $$\to$$ 2NaCl + Br$$_2$$

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 39

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Given:
Co$$^{3+}$$ + e$$^-$$ $$\to$$ Co$$^{2+}$$; E° = +1.81V
Pb$$^{3+}$$ + 2e$$^-$$ $$\to$$ Pb$$^{2+}$$; E° = +1.67V
Ce$$^{4+}$$ + e$$^-$$ $$\to$$ Ce$$^{3+}$$; E° = +1.61V
Bi$$^{3+}$$ + 3e$$^-$$ $$\to$$ Bi; E° = +0.20V
Oxidizing power of the species will increase in the order:

A

Co$$^{3+}$$ < Ce$$^{4+}$$ < Bi$$^{3+}$$ < Pb$$^{4+}$$

B

Bi$$^{3+}$$ < Ce$$^{4+}$$ < Pb$$^{4+}$$ < Co$$^{3+}$$

C

Co$$^{3+}$$ < Pb$$^{4+}$$ < Ce$$^{3+}$$ < Bi$$^{4+}$$

D

Ce$$^{4+}$$ < Pb$$^{4+}$$ < Bi$$^{3+}$$ < Co$$^{3+}$$

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 40

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The correct sequence of thermal stability of the following carbonates is:

A

BaCO$$_3$$ < CaCO$$_3$$ < SrCO$$_3$$ < MgCO$$_3$$

B

MgCO$$_3$$ < CaCO$$_3$$ < SrCO$$_3$$ < BaCO$$_3$$

C

BaCO$$_3$$ < SrCO$$_3$$ < CaCO$$_3$$ < MgCO$$_3$$

D

MgCO$$_3$$ < SrCO$$_3$$ < CaCO$$_3$$ < BaCO$$_3$$

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 41

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The basic structural unit of feldspar, zeolites, mica, and asbestos is:

A

SiO$$_4^{4-}$$

B

C

SiO$$_3^{2-}$$

D

SiO$$_2$$

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 42

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The increasing order of the pK$$_b$$ of the following compound is:

A

(B) < (D) < (C) < (A)

B

(B) < (D) < (A) < (C)

C

(C) < (A) < (D) < (B)

D

(A) < (C) < (D) < (B)

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 43

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The major product(s) obtained in the following reaction is/are:

A

B

C

CHO and OHC-CHO

D

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 44

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The major product of the following addition reaction is

A

B

C

D

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 45

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But-2-ene on reaction with alkaline KMnO$$_4$$ at elevated temperature followed by acidification will give:

A

2 molecules of CH$$_3$$COOH

B

C

2 Molecules of CH$$_3$$CHO

D

One molecule of CH$$_3$$CHO and one molecule of CH$$_3$$COOH

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 46

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The correct set of species responsible for the photochemical smog is:

A

CO$$_2$$, NO$$_2$$, SO$$_2$$ and hydrocarbons

B

NO$$_2$$, O$$_2$$, O$$_3$$ and hydrocarbons

C

NO$$_2$$, NO$$_2$$ and hydrocarbons

D

NO, NO$$_2$$, O$$_3$$ and hydrocarbons

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 47

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An element has a face-centered cubic fcc structure with a cell edge of a. The distance between the centres of two nearest tetrahedral voids in the lattice is

A

$$\frac{a}{2}$$

B

$$\frac{3}{2}a$$

C

a

D

$$\sqrt{2}a$$

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 48

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The mole fraction of a solvent in aqueous solution of a solute is 0.8. The molality (in mol kg$$^{-1}$$) of the aqueous solution is:

A

$$13.88 \times 10^{-3}$$

B

$$13.88 \times 10^{-1}$$

C

13.88

D

$$13.88 \times 10^{-2}$$

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 49

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In the following reaction; xA $$\to$$ yB
$$\log_{10}\left(-\frac{dA}{dt}\right) = \log_{10}\left(-\frac{dB}{dt}\right) + 0.3010$$
'A' and 'B' respectively can be:

A

C$$_2$$H$$_4$$ and C$$_4$$H$$_8$$

B

C$$_2$$H$$_2$$ and C$$_6$$H$$_6$$

C

n-Butane and Iso-butane

D

N$$_2$$O$$_4$$ and NO$$_2$$

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 50

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Peptization is a:

A

Process of converting a colloidal solution into precipitate

B

Process of converting soluble particles to form colloidal solution

C

Process of bringing colloidal molecule into solution

D

Process of converting precipitate into colloidal solution

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 51

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The idea of froth flotation method came from a person X and this method is related to the process Y of ores. X and Y, respectively, are:

A

Washer man and reduction

B

Fisher women and concentration

C

Fisher man and reduction

D

Washer woman and concentration

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 52

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The metal that gives hydrogen gas upon treatment with both the acid as well as the base is

A

Zinc

B

Magnesium

C

Iron

D

Mercury

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 53

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The complex ion that will lose its crystal field stabilization energy upon oxidation of metal to +3 state is:

(Phen = phenanthroline, ignore pairing energy)

A

[Ni(phen)$$_3$$]$$^{2+}$$

B

[Fe(phen)$$_3$$]$$^{2+}$$

C

[Co(phen)$$_3$$]$$^{2+}$$

D

[Zn(phen)$$_3$$]$$^{2+}$$

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 54

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Complete removal of both the axial ligands (along the z-axis) from an octahedral complex leads to which of the following splitting patterns? (relative orbital energies not on scale).

A

B

C

D

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 55

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The major products of the following reaction are:

A

B

C

D

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 56

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The major product of the following reaction:

A

B

C

D

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 57

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Which of the following is a thermosetting polymer?

A

Bakelite

B

PVC

C

Nylon 6

D

Buna-N

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 58

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An organic compound 'A' is oxidized with Na$$_2$$O$$_2$$ followed by boiling with HNO$$_3$$. The resultant solution is then treated with ammonium molybdate to yield a yellow precipitate. Based on above observation, the element present in the given compound is:

A

Fluorine

B

Phosphorus

C

Nitrogen

D

Sulphur

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 59

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Glucose and Galactose are having identical configuration in all the positions except position.

A

C - 3

B

C - 4

C

C - 5

D

C - 2

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NTA JEE Main 12th April 2019 Shift 1 - Chemistry - Question 60

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Which of the following statements is not true about RNA?

A

It controls the synthesis of protein

B

It usually does not replicate

C

It has always double standard α-helix structure

D

It is present in the nucleus of the cell

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