NTA JEE Main 7th January 2020 Shift 1 - Chemistry

NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 26

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Amongst the following statements, that which was not proposed by Dalton was:

A

chemical reactions involve reorganization of atoms. These are neither created nor destroyed in a chemical reaction.

B

all the atoms of a given element have identical properties including identical mass. Atoms of different elements differ in mass.

C

when gases combine or reproduced in a chemical reaction they do so in a simple ratio by volume provided all gases are at the same T & P.

D

matter consists of indivisible atoms.

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 27

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The number of orbitals associated with quantum numbers $$n = 5$$, $$m_s = +\frac{1}{2}$$ is:

A

11

B

25

C

50

D

15

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 28

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The electron gain enthalpy (in kJ/mol) of fluorine, chlorine, bromine and iodine, respectively, are

A

$$-296, -325, -333$$ and $$-349$$

B

$$-349, -333, -325$$ and $$-296$$

C

$$-333, -349, -325$$ and $$-296$$

D

$$-333, -325, -349$$ and $$-296$$

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 29

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The dipole moments of CCl$$_4$$, CHCl$$_3$$ and CH$$_4$$ are in the order

A

CHCl$$_3$$ < CH$$_4$$ = CCl$$_4$$

B

CCl$$_4$$ < CH$$_4$$ < CHCl$$_3$$

C

CH$$_4$$ < CCl$$_4$$ < CHCl$$_3$$

D

CH$$_4$$ = CCl$$_4$$ < CHCl$$_3$$

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 30

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The relative strength of the interionic/ intermolecular forces in a decreasing order is:

A

dipole-dipole > ion-dipole > ion-ion

B

ion-dipole > ion-ion > dipole-dipole

C

ion-dipole > dipole-dipole > ion-ion

D

ion-ion > ion-dipole > dipole-dipole

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 31

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Oxidation number of potassium in K$$_2$$O, K$$_2$$O$$_2$$ and KO$$_2$$, respectively, is:

A

$$+2, +1$$ and $$+\frac{1}{2}$$

B

$$+1, +1$$ and $$+1$$

C

$$+1, +4$$ and $$+2$$

D

$$+1, +2$$ and $$+4$$

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 32

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In comparison to the zeolite process for the removal of permanent hardness, the synthetic resin method is

A

less efficient as it exchanges only anions.

B

more efficient as it can exchange both cations as well as anions.

C

less efficient as the resins cannot be regenerated.

D

more efficient as it can exchange only cations.

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 33

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A solution of m-chloroaniline, m-chlorophenol and m-chlorobenzoic acid in ethyl acetate was extracted initially with a saturated solution of NaHCO$$_3$$ to give fraction A. The left over organic phase was extracted with dilute NaOH solution to give fraction B. The final organic layer was labelled as fraction C. Fractions A, B and C, contain respectively:

A

m-chlorobenzoic acid, m-chloroaniline and m-chlorophenol

B

m-chlorobenzoic acid, m-chlorophenol and m-chloroaniline

C

m-chlorophenol, m-chlorobenzoic acid and m-chloroaniline

D

m-chloroaniline, m-chlorobenzoic acid and m-chlorophenol

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 34

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The increasing order of pK$$_b$$ for the following compounds will be:

A

(B) < (C) < (A)

B

(A) < (B) < (C)

C

(C) < (A) < (B)

D

(B) < (A) < (C)

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 35

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Consider the following reactions:
(a) $$(CH_3)_3CCH(OH)CH_3 \xrightarrow{\text{conc.} H_2SO_4}$$
(b) $$(CH_3)_2CHCH(Br)CH_3 \xrightarrow{\text{alc. KOH}}$$
(c) $$(CH_3)_2CHCH(Br)CH_3 \xrightarrow{(CH_3)_3O^\ominus K^\oplus}$$
(d)

Which of the reaction(s) will not produce Saytzeff product?

A

(a), (c) and (d)

B

(d) only

C

(c) only

D

(b) and (d)

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 36

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At 35 $$^\circ$$C, the vapour pressure of CS$$_2$$ is 512 mmHg and that of acetone is 144 mmHg. A solution of CS$$_2$$ in acetone has a total vapour pressure of 600 mmHg. The false statement amongst the following is:

A

Raoult's law is not obeyed by this system

B

a mixture of 100 mL CS$$_2$$ and 100 mL acetone has a volume < 200 mL

C

CS$$_2$$ and acetone are less attracted to each other than to themselves

D

heat must be absorbed in order to produce the solution at 35$$^\circ$$C

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 37

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Given that the standard potentials (E$$^\circ$$) of Cu$$^{2+}$$/Cu and Cu$$^+$$/Cu are 0.34V and 0.522V respectively, the E$$^\circ$$ of Cu$$^{2+}$$/Cu$$^+$$ is:

A

0.182V

B

+0.158V

C

-0.182V

D

-0.158V

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 38

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The purest form of commercial iron is:

A

pig iron

B

wrought iron

C

cast iron

D

scrap iron and pig iron

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 39

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The atomic radius of Ag is closest to

A

Au

B

Ni

C

Cu

D

Hg

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 40

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The IUPAC name of the complex [Pt(NH$$_3$$)$$_2$$Cl(NH$$_2$$CH$$_3$$)]Cl is

A

Diamminechlorido (methanamine) platinum (II) chloride

B

Diammine(methanamine)chlorido platinum (II) chloride

C

Diamminechlorido (aminomethane) platinum (II) chloride

D

Bisammine (methanamine) chlorido platinum (II) chloride

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 41

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The theory that can completely/properly explain the nature of bonding in [Ni(CO)$$_4$$] is:

A

Werner's theory

B

Molecular orbital theory

C

Crystal field theory

D

Valence bond theory

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 42

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1-methyl ethylene oxide when treated with an excess of HBr produces

A

B

C

D

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 43

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What is the product of the following reaction?

A

B

C

D

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 44

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Consider the following reaction:

The product 'X' is used:

A

in protein estimation as an alternative to ninhydrin

B

in acid base titration as an indicator

C

as food grade colourant

D

in laboratory test for phenols

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 45

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Match the following:
(i) Riboflavin            (a) Beriberi
(ii) Thiamine            (b) Scurvy
(iii) Pyridoxine        (c) Cheilosis
(iv) Ascorbic acid    (d) Convulsions

A

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

B

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

C

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

D

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

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 46

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For the reaction:
A(l) $$\rightarrow$$ 2B(g)
$$\Delta U = 2.1$$ kcal, $$\Delta S = 20$$ cal K$$^{-1}$$ at 300K.
Hence $$\Delta G$$ in kcal is

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 47

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Two solutions, A and B, each of 100L was made by dissolving 4g of NaOH and 9.8g of H$$_2$$SO$$_4$$ in water, respectively. The pH of the resultant solution obtained from mixing 40L of solution A and 10L of solution B is (log 2 = 0.3)

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 48

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During the nuclear explosion, one of the products is $$^{90}$$Sr with half life of 6.93 years. If 1$$\mu$$g of $$^{90}$$Sr was absorbed in the bones of a newly born baby in place of Ca, how much time, in years, is required to reduce it by 90% if it is not lost metabolically

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 49

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Chlorine reacts with hot and concentrated NaOH and produces compounds (X) and (Y). Compound (X) gives white precipitate with silver nitrate solution. The average bond order between Cl and O atoms in (Y) is

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NTA JEE Main 7th January 2020 Shift 1 - Chemistry - Question 50

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The number of chiral carbons in chloramphenicol is

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