NTA JEE Main 4th September 2020 Shift 1 - Chemistry

NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 26

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The region in the electromagnetic spectrum where the Balmer series lines appear is:

A

Visible

B

Microwave

C

Infrared

D

Ultraviolet

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 27

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The elements with atomic numbers 101 and 104 belong to, respectively:

A

Group 11 and Group 4

B

Actinoids and Group 6

C

Actinoids and Group 4

D

Group 6 and Actinoids

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 28

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The ionic radii of $$O^{2-}$$, $$F^-$$, $$Na^+$$ and $$Mg^{2+}$$ are in the order:

A

$$F^- > O^{2-} > Na^+ > Mg^{2+}$$

B

$$O^{2-} > F^- > Na^+ > Mg^{2+}$$

C

$$Mg^{2+} > Na^+ > F^- > O^{2-}$$

D

$$O^{2-} > F^- > Mg^{2+} > Na^+$$

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 29

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The intermolecular potential energy for the molecules A, B, C and D given below suggests that:

A

A - D has the shortest bond length

B

A - A has the largest bond enthalpy

C

D is more electronegative than other atoms.

D

A - B has the stiffest bond.

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 30

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For one mole of an ideal gas, which of these statements must be true?
(a) Internal energy (U) and enthalpy (H) each depends on temperature.
(b) Compressibility factor Z is not equal to 1
(c) $$C_{P,m} - C_{V,m} = R$$
(d) $$dU = C_v dT$$ for any process

A

(a) and (c)

B

(b), (c) and (d)

C

(c) and (d)

D

(a), (c) and (d)

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 31

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On combustion of Li, Na and K in excess of air, the major oxides formed, respectively, are:

A

$$Li_2O_2$$, $$Na_2O$$ and $$K_2O_2$$

B

$$Li_2O$$, $$Na_2O_2$$ and $$KO_2$$

C

$$Li_2O$$, $$Na_2O$$ and $$K_2O_2$$

D

$$Li_2O$$, $$Na_2O_2$$ and $$K_2O$$

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 32

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On heating, lead (II) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with NO changes to a blue solid (C). The oxidation number of nitrogen in solid (C) is:

A

+5

B

+2

C

+3

D

+4

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 33

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The IUPAC name of the following compound is:

A

5-Bromo-3-methylcyclopentanoic acid

B

4-Bromo-2-methylcyclopentane carboxylic acid

C

3-Bromo-5-methylcyclopentanoic acid

D

3-Bromo-5-methylcyclopentanoic carboxylic acid

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 34

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The decreasing order of reactivity of the following organic molecules towards AgNO$$_3$$ solution is:

A

(C) > (D) > (A) > (B)

B

(A) > (B) > (D) > (C)

C

(A) > (B) > (C) > (D)

D

(B) > (A) > (C) > (D)

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 35

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Identify the incorrect statement from the options below for the above cell:

$$E^0_{Cu^{2+}|Cu} = +0.34$$ V,
$$E^0_{Zn^{2+}|Zn} = -0.76$$ V

A

If $$E_{ext} > 1.1$$ V, e$$^-$$ flow from Cu to Zn

B

If $$E_{ext} > 1.1$$ V, Zn dissolves at Zn electrode and Cu deposits at Cu electrode

C

If $$E_{ext} < 1.1$$ V, Zn dissolves at anode and Cu deposits at cathode

D

If $$E_{ext} = 1.1$$ V, no flow of e$$^-$$ or current occurs

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 36

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For the equilibrium $$A \rightleftharpoons B$$, the variation of the rate of the forward (a) and reverse (b) reaction with time is given by:

A

B

C

D

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 37

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Match the following:
(i) Foam            (a) smoke
(ii) Gel              (b) cell fluid
(iii) Aerosol       (c) jellies
(iv) Emulsion     (d) rubber
                          (e) froth
                          (f) milk

A

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

B

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

C

(i)-(e), (ii)-(c), (iii)-(a), (iv)-(f)

D

(i)-(d), (ii)-(b), (iii)-(e), (iv)-(f)

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 38

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Among statements (a) - (d), the correct ones are:
(a) Lime stone is decomposed to CaO during the extraction of iron from its oxides.
(b) In the extraction of silver, silver is extracted as an anionic complex.
(c) Nickel is purified by Mond's process.
(d) Zr and Ti are purified by Van Arkel method.

A

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

B

(a), (c) and (d) only

C

(b), (c) and (d) only

D

(c) and (d) only

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 39

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The number of isomers possible for $$[Pt(en)(NO_2)_2]$$ is:

A

2

B

4

C

1

D

3

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 40

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The pair in which both the species have the same magnetic moment (spin only) is:

A

$$[Cr(H_2O)_6]^{2+}$$ and $$[Fe(H_2O)_6]^{2+}$$

B

$$[Co(OH)_4]^{2-}$$ and $$[Fe(NH_3)_6]^{2+}$$

C

$$[Mn(H_2O)_6]^{2+}$$ and $$[Cr(H_2O)_6]^{2+}$$

D

$$[Cr(H_2O)_6]^{2+}$$ and $$[CoCl_4]^{2-}$$

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 41

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An organic compound (A) (molecular formula $$C_6H_{12}O_2$$) was hydrolysed with dil. $$H_2SO_4$$ to give a carboxylic acid (B) and an alcohol (C). 'C' gives white turbidity immediately when treated with anhydrous $$ZnCl_2$$ and conc. HCl. The organic compound (A) is:

A

B

C

D

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 42

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When neopentyl alcohol is heated with an acid, it slowly converted into an 85:15 mixture of alkenes A and B, respectively. What are these alkenes?

A

B

C

D

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 43

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[P] on treatment with $$Br_2/FeBr_3$$ in $$CCl_4$$ produced a single isomer $$C_8H_7O_2Br$$ while heating [P] with sodalime gives toluene. The compound [P] is:

A

B

C

D

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 44

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Which of the following will react with $$CHCl_3$$ + alc. KOH?

A

Adenine and proline

B

Thymine and proline

C

Adenine and lysine

D

Adenine and thymine

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 45

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What are the functional groups present in the structure of maltose?

A

One ketal and one hemiketal

B

Two acetals

C

One acetal and one hemiacetal

D

One acetal and one ketal

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 46

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The mass of ammonia in grams produced when 2.8 kg of dinitrogen quantitatively reacts with 1 kg of dihydrogen is __________

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 47

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A 20.0 mL solution containing 0.2 g impure $$H_2O_2$$ reacts completely with 0.316 g of $$KMnO_4$$ in acid solution. The purity of $$H_2O_2$$ (in %) is __________ (mol. wt. of $$H_2O_2$$ = 34; mol. wt. of $$KMnO_4$$ = 158)

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 48

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At 300 K, the vapour pressure of a solution containing 1 mole of n-hexane and 3 moles of n-heptane is 550 mm of Hg. At the same temperature, if one more mole of n-heptane is added to this solution, the vapour pressure of the solution increases by 10 mm of Hg. What is the vapour pressure in mmHg of n-heptane in its pure state?

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 49

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If 75% of a first order reaction was completed in 90 minutes, 60% of the same reaction would be completed in approximately (in minutes) __________ (Take: log 2 = 0.30; log 2.5 = 0.40)

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NTA JEE Main 4th September 2020 Shift 1 - Chemistry - Question 50

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The number of chiral centres present in [B] is __________

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