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2023 96 questions

Q682023 · 6 Apr 2023 · Shift 2
Group-13 elements react with $O_{2}$ in amorphous form to form oxides of type $M_{2} O_{3}$ ( $M = element$ ). Which among the following is the most basic oxide?
1. A. $A l_{2} O_{3}$
2. B. $T l_{2} O_{3}$
3. C. $B_{2} O_{3}$
4. D. $G a_{2} O_{3}$
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Answer: B
Q722023 · 6 Apr 2023 · Shift 2
1. A.
2. B.
3. C.
4. D.
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Answer: B
Q752023 · 6 Apr 2023 · Shift 2
The volume of $0.02 M$ aqueous $HBr$ required to neutralize $10.0 mL$ of $0.01 M$ aqueous $Ba (OH)_{2}$ is (Assume complete neutralization)
1. A. $7.5 mL$
2. B. $5.0 mL$
3. C. $10.0 mL$
4. D. $2.5 mL$
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Answer: C
Q782023 · 6 Apr 2023 · Shift 2
Structures of $BeC l_{2}$ in solid state, vapour phase and at very high temperature respectively are :
1. A.Polymeric, Dimeric, Monomeric
2. B.Dimeric, Polymeric, Monomeric
3. C.Polymeric, Monomeric, Dimeric
4. D.Monomeric, Dimeric, Polymeric
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Answer: A
Q792023 · 6 Apr 2023 · Shift 2
The group of chemicals used as pesticide is :
1. A.Dieldrin, Sodium arsinite, Tetrachloroethene
2. B.Aldrin, Sodium chlorate, Sodium arsinite
3. C.DDT, Aldrin
4. D.Sodium chlorate, DDT, PAN
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Answer: C
Q642023 · 1 Feb 2023 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: D
Q702023 · 1 Feb 2023 · Shift 1
1. A.
2. B.
3. C.
4. D.
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Answer: C
Q642023 · 31 Jan 2023 · Shift 1
$Nd^{2 +} =$
1. A. $4 f^{4} 6 s^{2}$
2. B. $4 f^{3}$
3. C. $4 f^{4}$
4. D. $4 f^{2} 6 s^{2}$
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Answer: C
Q682023 · 31 Jan 2023 · Shift 1
1. A.
2. B.
3. C.
4. D.
Show answer
Answer: A
Q752023 · 31 Jan 2023 · Shift 1
Match List I with List II | List I | List II | | :--- | :--- | | A. $XeF_{4}$ | I. See-saw | | B. $SF_{4}$ | II. Square-planar | | C. $NH_{4}^{+}$ | III. Bent T-shaped | | D. $BrF_{3}$ | IV. Tetrahedral | Choose the correct answer from the options given below :
1. A.A - II, B - I, C - III, D - IV
2. B.A - II, B - I, C - IV, D - III
3. C.A - IV, B - I, C - II, D - III
4. D.A - IV, B - III, C - II, D - I
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Answer: B
Q632023 · 31 Jan 2023 · Shift 2
1. A.
2. B.
3. C.
4. D.
Show answer
Answer: B
Q762023 · 31 Jan 2023 · Shift 2
Given below are two statements : Statement I : $H_{2} O_{2}$ is used in the synthesis of Cephalosporin Statement II : $H_{2} O_{2}$ is used for the restoration of aerobic conditions to sewage wastes. In the light of the above statements, choose the most appropriate answer from the options given below :
1. A.Statement I is incorrect but Statement II is correct
2. B.Statement I is correct but Statement II is incorrect
3. C.Both Statement I and Statement II are incorrect
4. D.Both Statement I and Statement II are correct
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Answer: D
Q782023 · 31 Jan 2023 · Shift 2
Which of the following compounds are not used as disinfectants ? A. Chloroxylenol B. Bithional C. Veronal D. Prontosil E. Terpineol Choose the correct answer from the options given below :
1. A.A, B
2. B.C, D
3. C.B, D, E
4. D.A, B, E
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Answer: B
Q802023 · 31 Jan 2023 · Shift 2
Which one of the following statements is incorrect?
1. A.Cast iron is obtained by melting pig iron with scrap iron and coke using hot air blast.
2. B.The malleable iron is prepared from cast iron by oxidising impurities in a reverberatory furnace.
3. C.van Arkel method is used to purify tungsten.
4. D.Boron and Indium can be purified by zone refining method.
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Answer: C
Q822023 · 31 Jan 2023 · Shift 2· Numerical answer
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Answer: 3
Q652023 · 30 Jan 2023 · Shift 1
1. A. $H_{D} > H_{C} > H_{B} > H_{A}$
2. B. $H_{C} > H_{A} > H_{D} > H_{B}$
3. C. $H_{C} > H_{D} > H_{B} > H_{A}$
4. D. $H_{C} > H_{D} > H_{A} > H_{B}$
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Answer: D
Q742023 · 30 Jan 2023 · Shift 1
Caprolactam when heated at high temperature in presence of water, gives
1. A.Dacron
2. B.Nylon 6
3. C.Teflon
4. D.Nylon 6,6
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Answer: B
Q882023 · 30 Jan 2023 · Shift 1· Numerical answer
A solution containing $2 g$ of a non-volatile solute in $20 g$ of water boils at $373.52 K$ . The molecular mass of the solute is ___________ $g mol^{- 1}$ . (Nearest integer) Given, water boils at $373 K$ , $K_{b}$ for water $= 0.52 K kg mol^{- 1}$
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Answer: 100
Q622023 · 29 Jan 2023 · Shift 1
The magnetic behaviour of $L i_{2} O, N a_{2} O_{2}$ and $K O_{2}$ , respectively, are :
1. A.paramagnetic, paramagnetic and diamagnetic
2. B.paramagnetic, diamagnetic and paramagnetic
3. C.diamagnetic, paramagnetic and diamagnetic
4. D.diamagnetic, diamagnetic and paramagnetic
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Answer: D
Q672023 · 29 Jan 2023 · Shift 1
The shortest wavelength of hydrogen atom in Lyman series is $λ$ . The longest wavelength in Balmer series of $H e^{+}$ is
1. A. $\frac{36 λ}{5}$
2. B. $\frac{5}{9 λ}$
3. C. $\frac{9 λ}{5}$
4. D. $\frac{5 λ}{9}$
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Answer: C
Q732023 · 29 Jan 2023 · Shift 1
The correct order of hydration enthalpies is (A) $K^{+}$ (B) $R b^{+}$ (C) $M g^{2 +}$ (D) $C s^{+}$ (E) $C a^{2 +}$ Choose the correct answer from the options given below :
1. A.E > C > A > B > D
2. B.C > A > E > B > D
3. C.C > E > A > D > B
4. D.C > E > A > B > D
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Answer: D
Q762023 · 29 Jan 2023 · Shift 1
Which of the given compounds can enhance the efficiency of hydrogen storage tank?
1. A. $Si H_{4}$
2. B. $Li/ P_{4}$
3. C. $NaN i_{5}$
4. D.Di-isobutylaluminium hydride
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Answer: C
Q842023 · 29 Jan 2023 · Shift 1· Numerical answer
The number of molecules or ions from the following, which do not have odd number of electrons are ____. (A) $N O_{2}$ (B) $IC l_{4}^{-}$ (C) $Br F_{3}$ (D) $Cl O_{2}$ (E) $N O_{2}^{+}$ (F) NO
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Answer: 3
Q632023 · 29 Jan 2023 · Shift 2
Which of the following relations are correct? (A) $Δ U = q + p Δ V$ (B) $Δ G = Δ H - T Δ S$ (C) $Δ S = \frac{q _{rev}}{T}$ (D) $Δ H = Δ U - Δ n RT$ Choose the most appropriate answer from the options given below :
1. A.A and B only
2. B.B and C only
3. C.C and D only
4. D.B and D only
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Answer: B
Q902023 · 29 Jan 2023 · Shift 2· Numerical answer
On heating, $LiN O_{3}$ gives how many compounds among the following ____ $L i_{2} O, N_{2}, O_{2}, LiN O_{2}, N O_{2}$
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Answer: 3