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Chemistry MCQs for NEET — Practice Questions with Answers

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Consider the following reaction:

${MX}_{4} + X'_{2} \to {MX}_{4} X'_{2}$

If atomic number of M is 52 and X and X' are halogens and X' is more electronegative than X.

Then choose correct statement regarding given information:

Both X' atoms occupy axial positions which are formed by overlapping of p and d-orbitals only

All $M — X bond lengths are identical in both {MX}_{4} and {MX}_{4} X'_{2} compounds$

Central atom 'M' does not use anyone valence non-axial set of d-orbital in hybridization of final product

Hybridization of central atom 'M' remains same in both reactant and final product.

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Explanation

In MX4X'2, the hybridization of the central atom 'M' involves one set of axial d-orbitals and three sets of p-orbitals. Since no other d-orbitals are used, the correct statement is that the central atom 'M' does not use any non-axial set of d-orbitals in hybridization.

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Which atom can have more than eight valence electrons when it is forming covalent bond?

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Explanation

(d) Due to presence of vacant d-orbital excitation in Cl-atom and it can have more than eight valence electrons whem it is forming hypervalent compound like HCl $O_{4}$

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Which bond is expected to be the least polar?

O-F

P-F

Si-N

B-F

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Explanation

(a) Bond polarity is directly related to difference of electronegativity of bonded atoms .

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Select correct statement(s) :

Acidic strength of $HBr > HCl$ but reverse is true for their reducing property

Basic strength of ${PH}_{3} > {AsH}_{3}$ but reverse is true for their bond angle

Dipole moment of ${CH}_{3} Cl > {CH}_{3} F$ but reverse is true for their $H \hat{C} H$ bond angle

$K_{a_{1}}$ of fumaric acid is higher than maleic acid but reverse is true for their $K_{a_{2}}$

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Which set contains only covalently bonded molecules?

$B C l_{3}, S i C l_{4}, P C l_{3}$

$N H_{4} B r, N_{2} H_{4}, H B r$

$I_{2,} H_{2} S, N A I$

$A l_{2}, O_{3}, A S_{4}$

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Explanation

(a) The set of compound $B C l_{3}, S i C l_{4}, P C l_{3}$ are predominately covalent compounds . $N H_{4} B r$ and $N a I$ ionic compounds and $A l$ contains metalic lattice.

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In which of the following species, d-orbitals having xz and yz two nodal planes involved in hybridization of central atom?

${IO}_{2} F_{2}^{-}$

${ClF}_{4}^{-}$

${IF}_{7}$

None of these

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Explanation

(c) ${IO}_{2} F_{2}^{-} : Hyb . {sp}^{3} d, [\equiv {sp}_{x} p_{y} p_{z} d_{z^{2}}] {CIF}_{4}^{-} : Hyb . {sp}^{3} d^{2}, [\equiv {sp}_{x} p_{y} p_{z} d_{x^{2} - y^{2}} d_{z^{2}}] {IF}_{7} : Hyb . {sp}^{3} d^{3} . [{sp}_{x} p_{y} p_{z} d_{x^{2} - y^{2}} d_{xy} d_{z^{2}}] d_{xy} : orbitals has two nodal planes xz and yz$

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Select pair of compound in which both have differant hybridization but have same molecular geomatery:

$B F_{3,} B r F_{3}$

$I C I_{2}, B e C I_{2}$

$B C I_{3,} P C I_{3}$

$P C I_{3,} N C I_{3}$

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Explanation

(b) $B F_{3} s p^{2}$ Trigonal planar

$B r F_{3} s p^{3} d$ Bent 'T' shape

$I C I_{2} s p^{3} d$ Linear

$B e C I_{2} s p$ Linear

$B C I_{3} s p^{2}$ Trigonal planar

$P C I_{3} s p^{3}$ Pyramidal

$N C I_{3} s p^{3}$ Pyramidal

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Which molecule does not exist?

$O F_{2}$

$O F_{4}$

$S F_{2}$

$S F_{4}$

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Explanation

(b) Maximum covalency of oxygen atom is three, hence $O F_{4}$ does not exist

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A compound contains three elements A, B and C , if the oxidation of A = +2, B = +5 Aand C = -2, the possible formula of the compound is:

$A_{3} (B_{4} C)_{2}$

$A_{3} (B C_{4})_{2}$

$A_{2} (B C_{3})_{2}$

$A B C_{2}$

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Explanation

(b) $A^{2 +} + B {C_{4}}^{3 -} \Rightarrow A_{3} (B C_{4})_{2}$

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The spacies having no p $π$ -p $π$ bond but has bond order equal to that of $O_{2}$

$C I O \underset{3}{-}$

$P {O_{4}}^{3 -}$

$S {O_{4}}^{2 -}$

$X e O_{3}$

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