NTA JEE Main 25th July 2021 Shift 2 - Chemistry

NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 31

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The spin only magnetic moments (in BM) for free Ti$$^{3+}$$, V$$^{2+}$$ and Sc$$^{3+}$$ ions respectively are (At.No. Sc : 21, Ti : 22, V : 23)

A

3.87, 1.73, 0

B

1.73, 3.87, 0

C

1.73, 0, 3.87

D

0, 3.87, 1.73

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 32

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The ionic radii of F$$^-$$ and O$$^{2-}$$ respectively are 1.33 A and 1.4A, while the covalent radius of N is 0.74A. The correct statement for the ionic radius of N$$^{3-}$$ from the following is:

A

It is smaller than F$$^-$$ and N

B

It is bigger than O$$^{2-}$$ and F$$^-$$

C

It is bigger than F$$^-$$ and N, but smaller than O$$^{2-}$$

D

It is smaller than O$$^{2-}$$ and F$$^-$$, but bigger than N

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 33

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In the following the correct bond order sequence is:

A

$$O_2^{2-} \gt O_2^{+} \gt O_2^{-} \gt O_2$$

B

$$O_2^{+} \gt O_2^{-} \gt O_2^{2-} \gt O_2$$

C

$$O_2^{+} \gt O_2 \gt O_2^{-} \gt O_2^{2-}$$

D

$$O_2 \gt O_2^{-} \gt O_2^{2-} \gt O_2^{+}$$

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 34

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Identify the species having one $$\pi$$-bond and maximum number of canonical forms from the following:

A

$$SO_3$$

B

$$O_2$$

C

$$SO_2$$

D

$$CO_3^{2-}$$

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 35

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Identify the process in which change in the oxidation state is five:

A

$$Cr_2O_7^{2-} \rightarrow 2Cr^{3+}$$

B

$$MnO_4^{-} \rightarrow Mn^{2+}$$

C

$$CrO_4^{2-} \rightarrow Cr^{3+}$$

D

$$C_2O_4^{2-} \rightarrow 2CO_2$$

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 36

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Which one of the following metals forms interstitial hydride easily?

A

Cr

B

Fe

C

Mn

D

Co

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 37

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Match List I with List II:
List-I (Elements)   List-II (Properties)
(a) Li   (i) Poor water solubility of I$$^-$$ salt
(b) Na   (ii) Most abundant element in cell fluid
(c) K   (iii) Bicarbonate salt used in fire extinguisher
(d) Cs   (iv) Carbonate salt decomposes easily on heating
Choose the correct answer from the options given below:

A

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

B

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

C

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

D

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

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 38

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The correct decreasing order of densities of the following compounds is:

A

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

B

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

C

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

D

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

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 39

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Which among the following is the strongest acid?

A

$$CH_3CH_2CH_2CH_3$$

B

C

D

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 40

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Given below are two statements:
Statement I : Chlorofluoro carbons breakdown by radiation in the visible energy region and release chlorine gas in the atmosphere which then reacts with stratospheric ozone.
Statement II : Atmospheric ozone reacts with nitric oxide to give nitrogen and oxygen gases, which add to the atmosphere.
For the above statements choose the correct answer from the options given below:

A

Statement I is incorrect but statement II is true

B

Both statement I and II are false

C

Statement I is correct but statement II is false

D

Both statement I and II are correct

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 41

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Match List I with List II:
List-I (Example of colloids)          List-II (Classification)
(a) Cheese                                 (i) dispersion of liquid in liquid
(b) Pumice stone                      (ii) dispersion of liquid in gas
(c) Hair cream                           (iii) dispersion of gas in solid
(d) Cloud                                    (iv) dispersion of liquid in solid
Choose the most appropriate answer from the options given below:

A

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

B

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

C

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

D

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

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 42

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Match List I with List II: (Both having metallurgical terms)
List-I                                      List-II
(a) Concentration of Ag ore    (i) Reverberatory furnace
(b) Blast furnace                   (ii) Pig iron
(c) Blister copper                  (iii) Leaching with dilute NaCN solution
(d) Froth floatation method   (iv) Sulfide ores
Choose the correct answer from the options given below:

A

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

B

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

C

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

D

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

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 43

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Which one of the following metal complexes is most stable?

A

$$[Co(en)(NH_3)_4]Cl_2$$

B

$$[Co(en)_3]Cl_2$$

C

$$[Co(en)_2(NH_3)_2]Cl_2$$

D

$$[Co(NH_3)_6]Cl_2$$

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 44

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Consider the above reaction sequence, Product "A" and Product "B" formed respectively are:

A

B

C

D

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 45

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What is the major product "P" of the following reaction?

A

B

C

D

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 46

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Maleic anhydride
Maleic anhydride can be prepared by:

A

Heating trans-but-2-enedioic acid

B

Heating cis-but-2-enedioic acid

C

Treating cis-but-2-enedioic acid with alcohol and acid

D

Treating trans-but-2-enedioic acid with alcohol and acid

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 47

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Consider the above reaction, the Product "P" is:

A

B

C

D

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 48

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A reaction of benzonitrile with one equivalent CH$$_3$$MgBr followed by hydrolysis produces a yellow liquid "P". The compound "P" will give positive _________ test.

A

Iodoform test

B

Schiff's test

C

Ninhydrin's test

D

Tollen's test

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 49

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A biodegradable polyamide can be made from:

A

Glycine and isoprene

B

Hexamethylene diamine and adipic acid

C

Glycine and aminocaproic acid

D

Styrene and caproic acid

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 50

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Which one of the following is correct structure for cytosine?

A

B

C

D

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 51

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The number of significant figures in 0.00340 is _________

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 52

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An accelerated electron has a speed of $$5 \times 10^6$$ ms$$^{-1}$$ with an uncertainty of 0.02%. The uncertainty in finding its location while in motion is $$x \times 10^{-9}$$ m. The value of $$x$$ is _________. (Nearest integer)
[Use mass of electron = $$9.1 \times 10^{-31}$$ kg, h = $$6.63 \times 10^{-34}$$ Js, $$\pi$$ = 3.14]

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 53

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An LPG cylinder contains gas at a pressure of 300 kPa at 27°C. The cylinder can withstand the pressure of $$1.2 \times 10^6$$ Pa. The room in which the cylinder is kept catches fire. The minimum temperature at which the bursting of cylinder will take place is _________ °C. (Nearest integer)

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 54

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A system does 200 J of work and at the same time absorbs 150 J of heat. The magnitude of the change in internal energy is _________J. (Nearest integer)

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 55

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Assuming that Ba(OH)$$_2$$ is completely ionised in aqueous solution under the given conditions the concentration of H$$_3$$O$$^+$$ ions in 0.005M aqueous solution of Ba(OH)$$_2$$ at 298 K is _________ $$\times 10^{-12}$$ mol L$$^{-1}$$. (Nearest integer)

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 56

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0.8 g of an organic compound was analysed by Kjeldahl's method for the estimation of nitrogen. If the percentage of nitrogen in the compound was found to be 42%, then _________ mL of 1M H$$_2$$SO$$_4$$ would have been neutralized by the ammonia evolved during the analysis.

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 57

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Consider the above chemical reaction. The total number of stereoisomers possible for Product "P" is _________

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 58

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When 3.00 g of a substance X' is dissolved in 100 g of CCl$$_4$$, it raises the boiling point by 0.60 K. The molar mass of the substance 'X' is _________ g mol$$^{-1}$$. (Nearest integer).
[Given K$$_b$$ for CCl$$_4$$ is 5.0 K kg mol$$^{-1}$$]

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 59

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For a chemical reaction A $$\rightarrow$$ B, it was found that concentration of B is increased by 0.2 mol L$$^{-1}$$ in 30 min. The average rate of the reaction is _________ $$\times 10^{-1}$$ mol L$$^{-1}$$ h$$^{-1}$$. (in nearest integer)

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NTA JEE Main 25th July 2021 Shift 2 - Chemistry - Question 60

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Number of electrons present in 4f orbital of Ho$$^{3+}$$ ion is _________ (Given Atomic No. of Ho = 67)

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