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2022 74 questions

Q782022 · 28 Jul 2022 · Shift 2
Concentrated $HN O_{3}$ reacts with Iodine to give :
1. A. $HI$ , $N O_{2}$ and $H_{2} O$
2. B. $HI O_{2}$ , $N_{2} O$ and $H_{2} O$
3. C. $HI O_{3}$ , $N O_{2}$ and $H_{2} O$
4. D. $HI O_{4}$ , $N O_{2}$ and $H_{2} O$
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Answer: C
Q822022 · 28 Jul 2022 · Shift 2· Numerical answer
If the wavelength for an electron emitted from H-atom is $3.3 \times 1 0^{- 10} m$ , then energy absorbed by the electron in its ground state compared to minimum energy required for its escape from the atom, is ____ times. (Nearest integer) [ Given : $h = 6.626 \times 1 0^{- 34} J s$ ] Mass of electron $= 9.1 \times 1 0^{- 31} kg$
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Answer: 2
Q622022 · 27 Jul 2022 · Shift 1
Given below are two statements. Statement I: $O_{2}$ , $Cu^{2 +}$ , and $Fe^{3 +}$ are weakly attracted by magnetic field and are magnetized in the same direction as magnetic field. Statement II: $NaCl$ and $H_{2} O$ are weakly magnetized in opposite direction to magnetic field. In the light of the above statements, choose the most appropriate answer from the options given below.
1. A.Both Statement I and Statement II are correct.
2. B.Both Statement I and Statement II are incorrect.
3. C.Statement I is correct but Statement II is incorrect.
4. D.Statement I is incorrect but Statement II is correct.
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Answer: A
Q652022 · 27 Jul 2022 · Shift 1
The incorrect statement is
1. A.The first ionization enthalpy of K is less than that of Na and Li.
2. B.Xe does not have the lowest first ionization enthalpy in its group.
3. C.The first ionization enthalpy of element with atomic number 37 is lower than that of the element with atomic number 38.
4. D.The first ionization enthalpy of Ga is higher than that of the d-block element with atomic number 30.
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Answer: D
Q672022 · 27 Jul 2022 · Shift 1
The total number of $Mn = O$ bonds in $Mn_{2} O_{7}$ is _________.
1. A.4
2. B.5
3. C.6
4. D.3
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Answer: C
Q692022 · 27 Jul 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: A
Q702022 · 27 Jul 2022 · Shift 1
A sugar 'X' dehydrates very slowly under acidic condition to give furfural which on further reaction with resorcinol gives the coloured product after sometime. Sugar 'X' is
1. A.Aldopentose
2. B.Aldotetrose
3. C.Oxalic acid
4. D.Ketotetrose
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Answer: A
Q762022 · 27 Jul 2022 · Shift 1
Given below are two statements. Statement I: The chlorides of $Be$ and $Al$ have $Cl$ -bridged structure. Both are soluble in organic solvents and act as Lewis bases. Statement II: Hydroxides of $Be$ and $Al$ dissolve in excess alkali to give beryllate and aluminate ions. In the light of the above statements, choose the correct answer from the options given below.
1. A.Both Statement I and Statement II are true.
2. B.Both Statement I and Statement II are false.
3. C.Statement I is true but Statement II is false.
4. D.Statement I is false but Statement II is true.
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Answer: D
Q662022 · 26 Jul 2022 · Shift 1
$C ∙ l + C H_{4} \to A + B$ $A$ and $B$ in the above atmospheric reaction step are :
1. A. $C_{2} H_{6}$ and $C l_{2}$
2. B. $C ∙ HC l_{2}$ and $H_{2}$
3. C. $C ∙ H_{3}$ and $HCl$
4. D. $C_{2} H_{6}$ and $HCl$
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Answer: C
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