NTA JEE Main 24th January 2023 Shift 1 - Chemistry

NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 31

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It is observed that characteristic X-ray spectra of elements show regularity. When frequency to the power 'n' i.e. $$\nu^n$$ of X-rays emitted is plotted against atomic number Z, the following graph is obtained.

The value of 'n' is

A

1

B

2

C

$$\frac{1}{2}$$

D

3

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 32

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Decreasing order of the hydrogen bonding in following forms of water is correctly represented by
A. Liquid water
B. Ice
C. Impure water

A

A = B > C

B

B > A > C

C

C > B > A

D

A > B > C

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 33

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Order of Covalent bond;
A. KF > KI; LiF > KF
B. KF < KI; LiF > KF
C. SnCl$$_4$$ > SnCl$$_2$$; CuCl > NaCl
D. LiF > KF; CuCl > NaCl
E. KF < KI; CuCl > NaCl

A

C, E Only

B

B, C Only

C

B, C, E Only

D

A, B Only

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 34

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Match Column I with Column II
Column I      Column II
A. Soda ash      I. CaSO$$_4$$
B. Chlorophyll      II. CaOH$$_2$$
C. Used in Whitewashing      III. Na$$_2$$CO$$_3$$
D. Dentistry, ornamental work      IV. Mg$$^{2+}$$ ions

A

A - III, B - IV, C - I, D - II

B

A - II, B - I, C - III, D - IV

C

A - III, B - I, C - II, D - IV

D

A - II, B - III, C - IV, D - I

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 35

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Reaction of BeO with ammonia and hydrogen fluoride gives 'A' which on thermal decomposition gives BeF$$_2$$ and NH$$_4$$F. What is 'A'?

A

H$$_3$$NBeF$$_3$$

B

(NH$$_4$$)$$_2$$BeF$$_4$$

C

NH$$_4$$BeF$$_3$$

D

(NH$$_4$$)$$_2$$Be$$_2$$F$$_6$$

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 36

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Increasing order of stability of the resonance structure is:

A

C, D, B, A

B

C, A, B, D

C

D, C, A, B

D

D, C, B, A

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 37

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Which of the following is true about freons?

A

These are chlorofluorocarbon compounds

B

These are chemicals causing skin cancer

C

These are radicals of chlorine and chlorine monoxide

D

All radicals are called freons

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 38

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In the depression of freezing point experiment
A. Vapour pressure of the solution is less than that of pure solvent
B. Vapour pressure of the solution is more than that of pure solvent
C. Only solute molecules solidify at the freezing point
D. Only solvent molecules solidify at the freezing point

A

A and D only

B

B and C only

C

A and C only

D

A only

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 39

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Statement I: For colloidal particles, the values of colligative properties are of small order as compared to values shown by true solutions at same concentration.
Statement II: For colloidal particles, the potential difference between the fixed layer and the diffused layer of same charges is called the electrokinetic potential or zeta potential.
In the light of the above statements, choose the correct answer from the options given below:

A

Statement I is true but statement II is false

B

Statement I is false but Statement II is true

C

Both Statement I and Statement II are true

D

Both Statement I and Statement II are false

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 40

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Match List I with List II.
List I      List II
A. Reverberatory furnace      I. Pig iron
B. Electrolytic cell      II. Aluminium
C. Blast furnace      III. Silicon
D. Zone refining furnace      IV. Copper

A

A - IV, B - II, C - I, D - III

B

A - I, B - IV, C - II, D - III

C

A - I, B - III, C - II, D - IV

D

A - III, B - IV, C - I, D - II

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 41

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An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is:

A

$$Cu^{2+}$$

B

$$Ni^{2+}$$

C

$$Fe^{2+}$$

D

$$Co^{2+}$$

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 42

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Which of the Phosphorus oxoacid can create silver mirror from AgNO$$_3$$ solution?

A

HPO$$_{3n}$$

B

H$$_4$$P$$_2$$O$$_5$$

C

H$$_4$$P$$_2$$O$$_6$$

D

H$$_4$$P$$_2$$O$$_7$$

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 43

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The magnetic moment of a transition metal compound has been calculated to be 3.87 BM. The metal ion is

A

$$Cr^{2+}$$

B

$$Mn^{2+}$$

C

$$V^{2+}$$

D

$$Ti^{2+}$$

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 44

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The primary and secondary valencies of cobalt respectively in Co(NH$$_3$$)$$_5$$ClCl$$_2$$ are:

A

3 and 5

B

2 and 6

C

2 and 8

D

3 and 6

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 45

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Assertion A: Hydrolysis of an alkyl chloride is a slow reaction but in the presence of NaI, the rate of hydrolysis increases.
Reason R: I$$^-$$ is a good nucleophile as well as a good leaving group.
In the light of the above statements, choose the correct answer from the options given below:

A

A is false but R is true

B

A is true but R is false

C

Both A and R are true and R is the correct explanation of A

D

Both A and R are true and R is not the correct explanation of A

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 46

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In the following given reaction 'A' is

A

Option 1 (see figure)

B

Option 2 (see figure)

C

Option 3 (see figure)

D

Option 4 (see figure)

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 47

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'A' and 'B' formed in the following set of reactions are:

A

Option 1 (see figure)

B

Option 2 (see figure)

C

Option 3 (see figure)

D

Option 4 (see figure)

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 48

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'R' formed in the following sequence of reaction is:

A

Option 1 (see figure)

B

Option 2 (see figure)

C

Option 3 (see figure)

D

Option 4 (see figure)

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 49

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Compound X undergoes following sequence of reactions to give the Lactone Y.

A

Option 1 (see figure)

B

Option 2 (see figure)

C

Option 3 (see figure)

D

Option 4 (see figure)

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 50

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Given below are two statements:
Statement I: Noradrenaline is a neurotransmitter.
Statement II: Low level of noradrenaline is not the cause of depression in human.
In the light of the above statements, choose the correct answer from the options given below:

A

Both statement 1 and 2 are correct.

B

Statement 1 is correct but statement 2 is incorrect

C

Statement 1 is incorrect but statement 2 is correct

D

Both statement 1 and 2 are correct

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 51

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If wavelength of the first line of the Paschen series of hydrogen atom is 720 nm, then the wavelength of the second line of this series is _____ nm. (Nearest integer)

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 52

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For independent process at 300 K.

Process	$$\Delta H$$ / kJmol$$^{-1}$$	$$\Delta S$$ / JK$$^{-1}$$
A	-25	-80
B	-22	40
C	25	-50
D	22	20

The number of non-spontaneous process from the following is _____.

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 53

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The dissociation constant of acetic is $$x \times 10^{-5}$$. When 25 mL of 0.2 M CH$$_3$$COONa solution is mixed with 25 mL of 0.02 M CH$$_3$$COOH solution, the pH of the resultant solution is found to be equal to 5. The value of $$x$$ is _____.

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 54

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Uracil is base present in RNA with the following structure. % of N in uracil is _____.

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 55

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When Fe$$_{0.93}$$O is heated in presence of oxygen, it converts to Fe$$_2$$O$$_3$$. The number of correct statement/s from the following is _____.
A. The equivalent weight of Fe$$_{0.93}$$O is $$\frac{\text{Molecular weight}}{0.79}$$
B. The number of moles of Fe$$^{2+}$$ and Fe$$^{3+}$$ in 1 mole of Fe$$_{0.93}$$O is 0.79 and 0.14 respectively.
C. Fe$$_{0.93}$$O is metal deficient with lattice comprising of cubic closed packed arrangement of O$$^{2-}$$ ions.
D. The % composition of Fe$$^{2+}$$ and Fe$$^{3+}$$ in Fe$$_{0.93}$$O is 85% and 15% respectively.

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 56

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5 g of NaOH was dissolved in deionized water to prepare a 450 mL stock solution. What volume (in mL) of this solution would be required to prepare 500 mL of 0.1 M solution? Given: Molar Mass of Na, O and H is 23, 16 and 1 g mol$$^{-1}$$ respectively

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 57

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At 298 K, a 1 litre solution containing 10 mmol of Cr$$_2$$O$$_7^{2-}$$ and 100 mmol of Cr$$^{3+}$$ shows a pH of 3.0. Given: Cr$$_2$$O$$_7^{2-} \to$$ Cr$$^{3+}$$; E$$^0 = 1.330$$ V and $$\frac{2.303RT}{F} = 0.059$$ V. The potential for the half cell reaction is $$x \times 10^{-3}$$ V. The value of $$x$$ is _____.

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 58

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The number of correct statement/s from the following is _____.
A. Larger the activation energy, smaller is the value of the rate constant.
B. The higher is the activation energy, higher is the value of the temperature coefficient.
C. At lower temperatures, increase in temperature causes more change in the value of k than at higher temperature.
D. A plot of ln k vs $$\frac{1}{T}$$ is a straight line with slope equal to $$\frac{-E_a}{R}$$

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 59

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The d-electronic configuration of CoCl$$_4^{2-}$$ in tetrahedral crystal field is $$e^m t_2^n$$. The sum of m and number of unpaired electrons is

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NTA JEE Main 24th January 2023 Shift 1 - Chemistry - Question 60

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Number of moles of AgCl formed in the following reaction is _____.

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