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2022 74 questions

Q742022 · 26 Jul 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: A
Q772022 · 26 Jul 2022 · Shift 1
Which of the following can be used to prevent the decomposition of $H_{2} O_{2}$ ?
1. A.Urea
2. B.Formaldehyde
3. C.Formic acid
4. D.Ethanol
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Answer: A
Q782022 · 26 Jul 2022 · Shift 1
Reaction of $BeC l_{2}$ with $LiAl H_{4}$ gives : (A) $AlC l_{3}$ (B) $Be H_{2}$ (C) $LiH$ (D) $LiCl$ (E) $BeAl H_{4}$ Choose the correct answer from options given below :
1. A.(A), (D) and (E)
2. B.(A), (B) and (D)
3. C.(D) and (E)
4. D.(B), (C) and (D)
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Answer: B
Q812022 · 26 Jul 2022 · Shift 1· Numerical answer
Chlorophyll extracted from the crushed green leaves was dissolved in water to make $2 L$ solution of $Mg$ of concentration $48 ppm$ . The number of atoms of $Mg$ in this solution is $x \times 1 0^{20}$ atoms. The value of $x$ is ____. (Nearest Integer) (Given : Atomic mass of $Mg$ is $24 g mo l^{- 1}$ ; $N_{A} = 6.02 \times 1 0^{23} mo l^{- 1}$ )
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Answer: 24
Q822022 · 26 Jul 2022 · Shift 1· Numerical answer
The wavelength of an electron and a neutron will become equal when the velocity of the electron is $x$ times the velocity of neutron. The value of $x$ is ____. (Nearest Integer) (Mass of electron is $9.1 \times 1 0^{- 31} kg$ and mass of neutron is $1.6 \times 1 0^{- 27} kg$ )
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Answer: 1758
Q702022 · 25 Jul 2022 · Shift 2
1. A. $A > B > C > D$
2. B. $B > A > C > D$
3. C. $D > C > A > B$
4. D. $D > C > B > A$
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Answer: A
Q712022 · 25 Jul 2022 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: A
Q762022 · 25 Jul 2022 · Shift 2
High purity (> 99.95%) dihydrogen is obtained by :
1. A.reaction of zinc with aqueous alkali.
2. B.electrolysis of acidified water using platinum electrodes.
3. C.electrolysis of warm aqueous barium hydroxide solution between nickel electrodes.
4. D.reaction of zinc with dilute acid.
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Answer: C
Q772022 · 25 Jul 2022 · Shift 2
The correct order of density is :
1. A.Be > Mg > Ca > Sr
2. B.Sr > Ca > Mg > Be
3. C.Sr > Be > Mg > Ca
4. D.Be > Sr > Mg > Ca
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Answer: C
Q782022 · 25 Jul 2022 · Shift 2
The total number of acidic oxides from the following list is $NO, N_{2} O, B_{2} O_{3}, N_{2} O_{5}, CO, S O_{3}, P_{4} O_{10}$
1. A.3
2. B.4
3. C.5
4. D.6
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Answer: B
Q822022 · 25 Jul 2022 · Shift 2· Numerical answer
When the excited electron of a H atom from n = 5 drops to the ground state, the maximum number of emission lines observed are _____________.
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Answer: 10
Q702022 · 30 Jun 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: D
Q782022 · 30 Jun 2022 · Shift 1
Which one of the following chemicals has not been used for the dry cleaning of clothes?
1. A.Tetrachloroethene
2. B.Liquid $C O_{2}$
3. C.Ethanol
4. D. $H_{2} O_{2}$
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Answer: C
Q662022 · 28 Jun 2022 · Shift 2
Among the following, basic oxide is :
1. A. $S O_{3}$
2. B. $Si O_{2}$
3. C. $CaO$
4. D. $A l_{2} O_{3}$
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Answer: C
Q752022 · 28 Jun 2022 · Shift 2
Hydrogen has three isotopes : protium ( $^{1} H$ ), deuterium ( $^{2} H$ or D) and tritium ( $^{3} H$ or T). They have nearly same chemical properties but different physical properties. They differ in :
1. A.number of protons.
2. B.atomic number.
3. C.electronic configuration.
4. D.atomic mass.
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Answer: D
Q892022 · 28 Jun 2022 · Shift 2· Numerical answer
$0.01 M$ $KMn O_{4}$ solution was added to $20.0 mL$ of $0.05 M$ Mohr's salt solution through a burette. The initial reading of $50 mL$ burette is zero. The volume of $KMn O_{4}$ solution left in the burette after the end point is ____ $mL$ . (nearest integer)
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Answer: 30
Q732022 · 27 Jun 2022 · Shift 1
Addition of $H_{2} S O_{4}$ to $Ba O_{2}$ produces :
1. A. $BaO$ , $S O_{2}$ and $H_{2} O$
2. B. $BaHS O_{4}$ and $O_{2}$
3. C. $BaS O_{4}$ , $H_{2}$ and $O_{2}$
4. D. $BaS O_{4}$ and $H_{2} O_{2}$
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Answer: D
Q742022 · 27 Jun 2022 · Shift 1
$BeC l_{2}$ reacts with $LiAl H_{4}$ to give :
1. A. $Be + Li [AlC l_{4}] + H_{2}$
2. B. $Be + Al H_{3} + LiCl + HCl$
3. C. $Be H_{2} + LiCl + AlC l_{3}$
4. D. $Be H_{2} + Li [AlC l_{4}]$
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Answer: C
Q782022 · 27 Jun 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: A
Q612022 · 27 Jun 2022 · Shift 2
Identify the incorrect statement for $PCl_{5}$ from the following.
1. A.In this molecule, orbitals of phosphorus are assumed to undergo $sp^{3} d$ hybridization.
2. B.The geometry of $PCl_{5}$ is trigonal bipyramidal.
3. C. $PCl_{5}$ has two axial bonds stronger than three equatorial bonds.
4. D.The three equatorial bonds of $PCl_{5}$ lie in a plane.
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Answer: C
Q682022 · 27 Jun 2022 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: A
Q712022 · 27 Jun 2022 · Shift 2
1. A.A-IV, B-III, C-II, D-I
2. B.A-IV, B-III, C-I, D-II
3. C.A-II, B-III, C-I, D-IV
4. D.A-IV, B-II, C-III, D-I
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Answer: A
Q902022 · 27 Jun 2022 · Shift 2· Numerical answer
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Answer: 12
Q672022 · 26 Jun 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: D
Q692022 · 26 Jun 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: C