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2023 96 questions

Q642023 · 25 Jan 2023 · Shift 1
1. A.A $\to$ iii, B $\to$ iv, C $\to$ i, D $\to$ ii
2. B.A $\to$ iv, B $\to$ iii, C $\to$ i, D $\to$ ii
3. C.A $\to$ i, B $\to$ ii, C $\to$ iii, D $\to$ iv
4. D.A $\to$ iii, B $\to$ iv, C $\to$ ii, D $\to$ i
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Answer: A
Q662023 · 25 Jan 2023 · Shift 1
Match List I with List II $A. B. C. D. List I Elements K Ca Sr Ba I. II. III. IV. List II Colour imparted to the flame Brick Red Violet Apple Green Crimson Red$ Choose the correct answer from the options given below :
1. A.A-II, B-IV, C-I, D-III
2. B.A-II, B-I, C-IV, D-III
3. C.A-II, B-I, C-III, D-IV
4. D.A-IV, B-III, C-II, D-I
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Answer: B
Q692023 · 25 Jan 2023 · Shift 1
The radius of the $2^{nd}$ orbit of $L i^{2 +}$ is $x$ . The expected radius of the $3^{rd}$ orbit of $B e^{3 +}$ is
1. A. $\frac{16}{27} x$
2. B. $\frac{4}{9} x$
3. C. $\frac{9}{4} x$
4. D. $\frac{27}{16} x$
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Answer: D
Q712023 · 25 Jan 2023 · Shift 1
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : Acetal / Ketal is stable in basic medium. Reason R : The high leaving tendency of alkoxide ion gives the stability to acetal/ketal in basic medium. In the light of the above statements, choose the correct answer from the options given below :
1. A.A is false but R is true.
2. B.Both A and R are true but R is NOT the correct explanation of A
3. C.Both A and R are true and R is the correct explanation of A
4. D.A is true but R is false.
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Answer: D
Q812023 · 25 Jan 2023 · Shift 1· Numerical answer
The density of a monobasic strong acid (Molar mass 24.2 g/mol) is 1.21 kg/L. The volume of its solution required for the complete neutralization of 25 mL of 0.24 M NaOH is ____ $\times 1 0^{- 2}$ mL (Nearest integer)
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Answer: 12
Q832023 · 25 Jan 2023 · Shift 1· Numerical answer
Consider the cell $Pt (s) ∣ H_{2} (g) (1 atm) ∣ H^{+} (aq, [H^{+}] = 1) ∣∣F e^{3 +} (aq), F e^{2 +} (aq) ∣Pt (s)$ Given $E_{F e^{3 +} /F e^{2 +}}^{o} = 0.771 V$ and $E_{H^{+} /1/2 H_{2}}^{o} = 0 V$ , $T = 298 K$ If the potential of the cell is 0.712 V, the ratio of concentration of $F e^{2 +}$ to $F e^{3 +}$ is ____ (Nearest integer)
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Answer: 10
Q612023 · 25 Jan 2023 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: D
Q642023 · 25 Jan 2023 · Shift 2
What is the mass ratio of ethylene glycol $(C_{2} H_{6} O_{2}$ , molar mass = 62 g/mol) required for making 500 g of 0.25 molal aqueous solution and 250 mL of 0.25 molar aqueous solution?
1. A.1 : 2
2. B.1 : 1
3. C.2 : 1
4. D.3 : 1
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Answer: C
Q732023 · 25 Jan 2023 · Shift 2
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Carbon forms two important oxides - CO and $C O_{2}$ . CO is neutral whereas $C O_{2}$ is acidic in nature Reason R : $C O_{2}$ can combine with water in a limited way to form carbonic acid, while CO is sparingly soluble in water In the light of the above statements, choose the most appropriate answer from the options given below :
1. A.A is not correct but R is correct
2. B.Both A and R are correct but R is NOT the correct explanation of A
3. C.Both A and R are correct and R is the correct explanation of A
4. D.A is correct but R is not correct
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Answer: C
Q842023 · 25 Jan 2023 · Shift 2· Numerical answer
$P t (s) ∣ H_{2} (g) (1 ba r) ∣ H^{+} (a q) (1 M) ∣∣ M^{3 +} (a q), M^{+} (a q) ∣ P t (s)$ The $E_{cell}$ for the given cell is 0.1115 V at 298 K when $\frac{[ M ^{+} ( a q )]}{[ M ^{3 +} ( a q )]} = 1 0^{a}$ The value of $a$ is ____ Given : $E_{M^{3 +} / M^{+}}^{θ} = 0.2$ V $\frac{2.303 R T}{F} = 0.059 V$
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Answer: 3
Q892023 · 25 Jan 2023 · Shift 2· Numerical answer
Based on the given figure, the number of correct statement/s is/are ____. [figure: liquid in a beaker, showing a liquid molecule on the surface and a liquid molecule in the bulk] A. Surface tension is the outcome of equal attractive and repulsive forces acting on the liquid molecule in bulk. B. Surface tension is due to uneven forces acting on the molecules present on the surface. C. The molecule in the bulk can never come to the liquid surface. D. The molecules on the surface are responsible for vapour pressure if the system is a closed system.
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Answer: 2
Q622023 · 24 Jan 2023 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: C
Q712023 · 24 Jan 2023 · Shift 1
Order of Covalent bond; A. $KF > KI; LiF > KF$ B. $KF < KI; LiF > KF$ C. $SnC l_{4} > SnC l_{2}; CuCl > NaCl$ D. $LiF > KF; CuCl < NaCl$ E. $KF < KI; CuCl > NaCl$ Choose the correct answer from the options given below :
1. A.B, C only
2. B.A, B only
3. C.C, E only
4. D.B, C, E only
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Answer: D
Q832023 · 24 Jan 2023 · Shift 1· Numerical answer
$5 g$ 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 $1 g mo l^{- 1}$ respectively
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Answer: 180
Q902023 · 24 Jan 2023 · Shift 1· Numerical answer
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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Answer: 492
Q612023 · 24 Jan 2023 · Shift 2
The number of s-electrons present in an ion with 55 protons in its unipositive state is
1. A.10
2. B.9
3. C.12
4. D.8
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Answer: A
Q712023 · 24 Jan 2023 · Shift 2
$K_{2} C r_{2} O_{7}$ paper acidified with dilute $H_{2} S O_{4}$ turns green when exposed to :
1. A.Sulphur dioxide
2. B.Sulphur trioxide
3. C.Hydrogen sulphide
4. D.Carbon dioxide
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Answer: A
Q722023 · 24 Jan 2023 · Shift 2
1. A.a only
2. B.Both a and c
3. C.c only
4. D.b only
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Answer: A
Q782023 · 24 Jan 2023 · Shift 2
Correct statement is :
1. A.An average human being consumes more food than air
2. B.An average human being consumes 100 times more air than food
3. C.An average human being consumes nearly 15 times more air than food
4. D.An average human being consumes equal amount of food and air
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Answer: C
Q852023 · 24 Jan 2023 · Shift 2· Numerical answer
Sum of $π$ -bonds present in peroxodisulphuric acid and pyrosulphuric acid is ____
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Answer: 8
Q902023 · 24 Jan 2023 · Shift 2· Numerical answer
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Answer: 2