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NEET NEET Questions — Free MCQ Practice

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Assertion : In tetrahedral hybridisation i.e., in ${sp}^{3}$ hybridisation all p-orbitals are involved and no

p-orbital is left for coming with $π$ -bonds.

Reason : Central atom can not form double bonds in the molecules or species having ${sp}^{3}$ hybridisation.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

The assertion is true because in sp3 hybridization, all four orbitals are involved in sigma (Ïƒ) bonding, and no p-orbital is left for pi (Ï€) bond formation. However, the reason is false because the central atom can form double bonds in molecules or species with sp2 hybridization, where one p-orbital is available for Ï€-bond formation.

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Assertion : $N_{2} {F_{3}}^{+}$ is planar at each nitrogen atom.

Reason : $N_{3} H,$ the bond angle $H ‐ N ‐ N$ is $120 °$ and both the $N ‐ H$ bond lengths are not equal.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Assertion : Carbon has unique ability to form $pπ - pπ$ multiple bonds with itself and with other

atoms of small size and high electronegativity.

Reason : Heavier elements of group $14^{th}$ do not form $pπ - pπ$ multiple bonds with itself because

their atomic orbitals are too large and diffuse to have effective overlapping.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(B) Both Assertion and Reason are true statements but are different and reason is

not true explanation of assertion. High electronegativity of atoms attached to carbon atom

indirectly results into the contraction of the size of p-orbitals. As carbon atomic size is smaller

and thus it has effective overlapping.

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Assertion : ${NO}^{+}$ and ${CN}^{-}$ both have same bond order and magnetism

Reason : ${NO}^{+}$ and ${CN}^{-}$ are isoelectornic species.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(A) Number of electrons ${NO}^{+} = 7 + 8 - 1 = 14$

Number of electrons ${CN}^{-} = 6 + 7 + 1 = 14$

Bond order $= \frac{10 - 4}{2} = 3$

Both are diamagnetic.

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Assertion : Crystals of hydrated calcium sulphate $(gypsum : {CaSO}_{4}, 2 H_{2} O)$ are soft and easily cleaved.

Reason : Crystals of anhydrous calcium sulphate $(anhydrite : {CaSO}_{4})$ are very hard and very difficult

to cleave.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(B) Within the ${Ca}^{2 +} / {SO}_{4}^{2 -}$ layers the ions are held together by strong electrovalent bonds. But

these separated ${Ca}^{2 +} / {SO}_{4}^{2 -}$ layers linked by relative weak H-bond. The weaker H-bonds and

stretched along the layer of water molecules.

Anhydride has a completely ionic structure involving only ${Ca}^{2 +} and {SO}_{4}^{2 -}$ ions.

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When two atoms combine to form a molecule

A.

Energy is released

B.

Energy is absorbed

C.

Energy is neither released not absorbed

D.

Energy may either released or absorbed

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Explanation

To attain stability energy is released.

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Compound having highest Melting Point :

A.

BeCl₂

B.

MgCl₂

C.

CaCl₂

D.

SrCl₂

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Explanation

As the size of cation increases polarising power decreases hence ionic character increases.

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The diamagnetic species among the following is-

A.

NO

B.

CO

C.

O₂

D.

B₂

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Explanation

CO is diamagnetic as there are no odd electrons in the molecule.

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Which of the statements are not true for AlCl₃-

A.

AlCl₃ fumes in moist air forms HCl with moisture

B.

Anhydrous AlCl₃ exists as Al₂Cl₆

C.

Anhydrous AlCl₃ is ionic

D.

Anhydrous AlCl₃ is trigonal planar molecule at higher temperature

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Explanation

Anhydrous AlCl₃ is covalent and is soluble in non polar solvents.

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Valency expresses-

A.

Total electrons in an atom

B.

Atomicity of an element

C.

Oxidation number of an element

D.

Combining capacity of an element

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Explanation

It is the basic definition.

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