Chemical Bonding · JEE Main previous year questions

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2022 20 questions

Q652022 · 29 Jul 2022 · Shift 1
Number of lone pairs of electrons in the central atom of $SC l_{2}$ , $O_{3}$ , $Cl F_{3}$ and $S F_{6}$ , respectively, are :
1. A.0, 1, 2 and 2
2. B.2, 1, 2 and 0
3. C.1, 2, 2 and 0
4. D.2, 1, 0 and 2
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Answer: B
Q812022 · 29 Jul 2022 · Shift 2· Numerical answer
Consider, $P F_{5}$ , $Br F_{5}$ , $PC l_{3}$ , $S F_{6}$ , $[IC l_{4}]^{-}$ , $Cl F_{3}$ and $I F_{5}$ . Amongst the above molecule(s)/ion(s), the number of molecule(s)/ion(s) having $s p^{3} d^{2}$ hybridisation is ____.
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Answer: 4
Q822022 · 28 Jul 2022 · Shift 1· Numerical answer
The number of paramagnetic species among the following is _________. $B_{2}$ , $Li_{2}$ , $C_{2}$ , $C_{2}^{-}$ , $O_{2}^{2 -}$ , $O_{2}^{+}$ and $He_{2}^{+}$
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Answer: 4
Q632022 · 28 Jul 2022 · Shift 2
Which of the following pair is not isoelectronic species? (At. no. $Sm, 62; Er, 68; Yb, 70; Lu, 71; Eu, 63; Tb, 65; Tm, 69$ )
1. A. $S m^{2 +}$ and $E r^{3 +}$
2. B. $Y b^{2 +}$ and $L u^{3 +}$
3. C. $E u^{2 +}$ and $T b^{4 +}$
4. D. $T b^{2 +}$ and $T m^{4 +}$
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Answer: A, D
Q832022 · 27 Jul 2022 · Shift 1· Numerical answer
Amongst the following, the number of oxide(s) which are paramagnetic in nature is $N a_{2} O, K O_{2}, N O_{2}, N_{2} O, Cl O_{2}, NO, S O_{2}, C l_{2} O$
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Answer: 4
Q852022 · 27 Jul 2022 · Shift 1· Numerical answer
According to MO theory, number of species/ions from the following having identical bond order is _________. $CN^{-}, NO^{+}, O_{2}, O_{2}^{+}, O_{2}^{2 +}$
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Answer: 3
Q612022 · 25 Jul 2022 · Shift 2
Match List I with List II: | List I (molecule) | List II (hybridization ; shape) | | :--- | :--- | | (A) $Xe O_{3}$ | (I) $s p^{3} d$ ; linear | | (B) $Xe F_{2}$ | (II) $s p^{3}$ ; pyramidal | | (C) $XeO F_{4}$ | (III) $s p^{3} d^{3}$ ; distorted octahedral | | (D) $Xe F_{6}$ | (IV) $s p^{3} d^{2}$ ; square pyramidal | Choose the correct answer from the options given below:
1. A.A-II, B-I, C-IV, D-III
2. B.A-II, B-IV, C-III, D-I
3. C.A-IV, B-II, C-III, D-I
4. D.A-IV, B-II, C-I, D-III
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Answer: A
Q852022 · 25 Jul 2022 · Shift 2· Numerical answer
The sum of number of lone pairs of electrons present on the central atoms of $Xe O_{3}$ , $XeO F_{4}$ and $Xe F_{6}$ , is ____ .
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Answer: 3
Q822022 · 30 Jun 2022 · Shift 1· Numerical answer
Amongst the following, the number of molecule/(s) having net resultant dipole moment is ___________. $N F_{3}$ , $B F_{3}$ , $Be F_{2}$ , $CHC l_{3}$ , $H_{2} S$ , $Si F_{4}$ , $CC l_{4}$ , $P F_{5}$
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Answer: 3
Q632022 · 28 Jun 2022 · Shift 2
In the structure of $S F_{4}$ , the lone pair of electrons on S is in.
1. A.equatorial position and there are two lone pair - bond pair repulsions at $9 0^{\circ}$ .
2. B.equatorial position and there are three lone pair - bond pair repulsions at $9 0^{\circ}$ .
3. C.axial position and there are three lone pair - bond pair repulsion at $9 0^{\circ}$ .
4. D.axial position and there are two lone pair - bond pair repulsion at $9 0^{\circ}$ .
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Answer: A
Q622022 · 27 Jun 2022 · Shift 1
Based upon VSEPR theory, match the shape (geometry) of the molecules in List-I with the molecules in List-II and select the most appropriate option. $(A) (B) (C) (D) List - I (Shape) T-shaped Trigonal planar Square planar See-saw (I) (II) (III) (IV) List - II (Molecules) Xe F_{4} S F_{4} Cl F_{3} B F_{3}$
1. A.(A) - (I), (B) - (II), (C) - (III), (D) - (IV)
2. B.(A) - (III), (B) - (IV), (C) - (I), (D) - (II)
3. C.(A) - (III), (B) - (IV), (C) - (II), (D) - (I)
4. D.(A) - (IV), (B) - (III), (C) - (I), (D) - (II)
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Answer: B
Q642022 · 27 Jun 2022 · Shift 1
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The ionic radii of $O^{2 -}$ and $M g^{2 +}$ are same. Reason (R) : Both $O^{2 -}$ and $M g^{2 +}$ are isoelectronic species. In the light of the above statements, choose the correct answer from the options given below.
1. A.Both (A) and (R) are true and (R) is the correct explanation of (A).
2. B.Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. C.(A) is true but (R) is false.
4. D.(A) is false but (R) is true.
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Answer: D
Q862022 · 27 Jun 2022 · Shift 1· Numerical answer
The number of statements correct from the following for Copper (at. no. 29) is/are ____________. (A) Cu(II) complexes are always paramagnetic. (B) Cu(I) complexes are generally colourless (C) Cu(I) is easily oxidized (D) In Fehling solution, the active reagent has Cu(I)
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Answer: 3
Q622022 · 27 Jun 2022 · Shift 2
The correct order of increasing intermolecular hydrogen bond strength is :
1. A. $HCN < H_{2} O < NH_{3}$
2. B. $HCN < CH_{4} < NH_{3}$
3. C. $CH_{4} < HCN < NH_{3}$
4. D. $CH_{4} < NH_{3} < HCN$
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Answer: C
Q632022 · 26 Jun 2022 · Shift 1
Consider the ions/molecule $O_{2}^{+}$ , $O_{2}$ , $O_{2}^{-}$ , $O_{2}^{2 -}$ For increasing bond order the correct option is :
1. A. $O_{2}^{2 -} < O_{2}^{-} < O_{2} < O_{2}^{+}$
2. B. $O_{2}^{-} < O_{2}^{2 -} < O_{2} < O_{2}^{+}$
3. C. $O_{2}^{-} < O_{2}^{2 -} < O_{2}^{+} < O_{2}$
4. D. $O_{2}^{-} < O_{2}^{+} < O_{2}^{2 -} < O_{2}$
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Answer: A
Q642022 · 26 Jun 2022 · Shift 1
The $(\frac{\partial E}{\partial T})_{p}$ of different types of half cells are as follows: | A | B | C | D | |---|---|---|---| | $1 \times 1 0^{- 4}$ | $2 \times 1 0^{- 4}$ | $0.1 \times 1 0^{- 4}$ | $0.2 \times 1 0^{- 4}$ | (Where E is the electromotive force) Which of the above half cells would be preferred to be used as reference electrode?
1. A.A
2. B.B
3. C.C
4. D.D
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Answer: C
Q822022 · 26 Jun 2022 · Shift 2· Numerical answer
Amongst $S F_{4}$ , $Xe F_{4}$ , $C F_{4}$ and $H_{2} O$ , the number of species with two lone pairs of electrons is ____.
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Answer: 2
Q622022 · 25 Jun 2022 · Shift 1
The pair, in which ions are isoelectronic with $Al^{3 +}$ is :
1. A. $Br^{-}$ and $Be^{2 +}$
2. B. $Cl^{-}$ and $Li^{+}$
3. C. $S^{2 -}$ and $K^{+}$
4. D. $O^{2 -}$ and $Mg^{2 +}$
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Answer: D
Q822022 · 25 Jun 2022 · Shift 2· Numerical answer
Amongst $Be F_{2}$ , $B F_{3}$ , $H_{2} O$ , $N H_{3}$ , $CC l_{4}$ and $HCl$ , the number of molecules with non-zero net dipole moment is ____.
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Answer: 3
Q632022 · 24 Jun 2022 · Shift 2
The correct order of bond orders of $C_{2}^{2 -}$ , $N_{2}^{2 -}$ and $O_{2}^{2 -}$ is, respectively
1. A. $C_{2}^{2 -} < N_{2}^{2 -} < O_{2}^{2 -}$
2. B. $O_{2}^{2 -} < N_{2}^{2 -} < C_{2}^{2 -}$
3. C. $C_{2}^{2 -} < O_{2}^{2 -} < N_{2}^{2 -}$
4. D. $N_{2}^{2 -} < C_{2}^{2 -} < O_{2}^{2 -}$
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Answer: B