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2022 74 questions

Q612022 · 29 Jul 2022 · Shift 1
Which of the following pair of molecules contains an odd electron molecule and an expanded octet molecule?
1. A. $BC l_{3}$ and $S F_{6}$
2. B. $NO$ and $H_{2} S O_{4}$
3. C. $S F_{6}$ and $H_{2} S O_{4}$
4. D. $BC l_{3}$ and $NO$
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Answer: B
Q722022 · 29 Jul 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: C
Q752022 · 29 Jul 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: B
Q762022 · 29 Jul 2022 · Shift 1
$100 mL$ of $5% (w/v)$ solution of $NaCl$ in water was prepared in $250 mL$ beaker. Albumin from the egg was poured into $NaCl$ solution and stirred well. This resulted in a/an :
1. A.Lyophilic sol
2. B.Lyophobic sol
3. C.Emulsion
4. D.Precipitate
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Answer: A
Q792022 · 29 Jul 2022 · Shift 1
Which among the following pairs has only herbicides?
1. A.Aldrin and Dieldrin
2. B.Sodium chlorate and Aldrin
3. C.Sodium arsinate and Dieldrin
4. D.Sodium chlorate and sodium arsinite
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Answer: D
Q762022 · 29 Jul 2022 · Shift 2
In liquation process used for tin (Sn), the metal :
1. A.is reacted with acid.
2. B.is dissolved in water.
3. C.is brought to molten form which is made to flow on a slope.
4. D.is fused with NaOH
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Answer: C
Q612022 · 28 Jul 2022 · Shift 1
Identify the incorrect statement from the following.
1. A.A circular path around the nucleus in which an electron moves is proposed as Bohr's orbit.
2. B.An orbital is the one electron wave function ( $ψ$ ) in an atom.
3. C.The existence of Bohr's orbits is supported by hydrogen spectrum.
4. D.Atomic orbital is characterised by the quantum numbers $n$ and $l$ only.
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Answer: D
Q622022 · 28 Jul 2022 · Shift 1
Which of the following relation is not correct?
1. A. $Δ H = Δ U - P Δ V$
2. B. $Δ U = q + W$
3. C. $Δ S_{sys} + Δ S_{surr} \geq 0$
4. D. $Δ G = Δ H - T Δ S$
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Answer: A
Q642022 · 28 Jul 2022 · Shift 1
In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical? (A) Rb and Cs (B) Na and K (C) Ar and Kr (D) I and At Choose the correct answer from the options given below :
1. A.(A) and (B) only
2. B.(B) and (C) only
3. C.(A) and (C) only
4. D.(C) and (D) only
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Answer: C
Q652022 · 28 Jul 2022 · Shift 1
Match List - I with List - II, match the gas evolved during each reaction. | | List - I | | List - II | |---|---|---|---| | (A) | $(NH_{4})_{2} Cr_{2} O_{7} Δ$ | (I) | $H_{2}$ | | (B) | $KMnO_{4} + HCl \to$ | (II) | $N_{2}$ | | (C) | $Al + NaOH + H_{2} O \to$ | (III) | $O_{2}$ | | (D) | $NaNO_{3} Δ$ | (IV) | $Cl_{2}$ | Choose the correct answer from the options given below :
1. A.(A) - (II), (B) - (III), (C) - (I), (D) - (IV)
2. B.(A) - (III), (B) - (I), (C) - (IV), (D) - (II)
3. C.(A) - (II), (B) - (IV), (C) - (I), (D) - (III)
4. D.(A) - (III), (B) - (IV), (C) - (I), (D) - (II)
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Answer: C
Q662022 · 28 Jul 2022 · Shift 1
Which of the following has least tendency to liberate $H_{2}$ from mineral acids?
1. A. $Cu$
2. B. $Mn$
3. C. $Ni$
4. D. $Zn$
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Answer: A
Q692022 · 28 Jul 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
Show answer
Answer: C
Q722022 · 28 Jul 2022 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: D
Q762022 · 28 Jul 2022 · Shift 1
The metal salts formed during softening of hardwater using Clark's method are :
1. A. $Ca(OH)_{2}$ and $Mg(OH)_{2}$
2. B. $CaCO_{3}$ and $Mg(OH)_{2}$
3. C. $Ca(OH)_{2}$ and $MgCO_{3}$
4. D. $CaCO_{3}$ and $MgCO_{3}$
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Answer: B
Q772022 · 28 Jul 2022 · Shift 1
Which of the following statement is incorrect?
1. A.Low solubility of LiF in water is due to its small hydration enthalpy.
2. B. $KO_{2}$ is paramagnetic.
3. C.Solution of sodium in liquid ammonia is conducting in nature.
4. D.Sodium metal has higher density than potassium metal.
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Answer: A
Q692022 · 28 Jul 2022 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: D
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