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NEET Practice Questions (MCQs) with Answers & Solutions

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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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Which pair of atom form strongest ionic bond?

Al and As

Al and N

Al and Se

AL and O

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Explanation

(d) Among given non-metals , O-atom has high electron affinity and strong ionic bond is formed between Al and O-atom

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The correct order of increasing s-character (in percentage) in the hybrid orbitals of the following molecules/ions is:

(i) ${CO}_{3}^{2 -}$ (ii) ${XeF}_{4}$ (iii) $I_{3}$ (iv) ${NCI}_{3}$ (v) ${BeCl}_{2}$

(ii)<(iii)<(iv)<(i)<(v)

(ii)<(iv)<(iii)<(v)<(i)

(iii)<(ii)<(i)<(v)<(iv)

(ii)<(iv)<(iii)<(i)<(v)

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Explanation

(a) ${CO}_{3}^{-} {XeF}_{4} I_{3}^{-} {NCL}_{3} {BeCL}_{2} {sp}^{2} {sp}^{3} d^{2} {sp}^{3} d {sp}^{3} sp$

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How many resonance forms can be written for the nitrate ion, ( $N {O_{3}}^{-}$ )?

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Explanation

The nitrate ion (NOâ‚ƒâ») has three resonance structures due to the delocalization of the negative charge over the three oxygen atoms. The three resonance forms help stabilize the ion by distributing the negative charge evenly.

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Which of the following fact is directly explained by the statement 'oxygen is a simillar atom than sulpher'?

$H_{2} O$ boils at a much higher tempreture than $H_{2} S$

$H_{2} S$ undergoes intermolecure hydrogen bonding

$H_{2} O$ is liquid and $H_{2} S$ is gas at room tempreture

S $—$ H bond is longer than O $—$ H bond

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Explanation

(d) As size of sulphur is higher than that of oxygen atom, hence bond length of S $—$ H bond is higher than of O $—$ H bond.

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Yes. You can attempt every NEET question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.