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Chemistry MCQs for NEET — Practice Questions with Answers

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P is responsible for heredity & P is formed by Q and R. So give the name for P, Q and R.

A. P = chromozomes Q = protein R = nucleic acid B. P = chromozomes Q = petrocine R = nucleic acid C. P = nucleicacid Q= chromozomes R = chromozomes D. p = DNA Q = sugar R = adenine

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Which of the following is ionic ?

A. HCl B. $CHCl_3 $ C. $IF_5 $ D. KI

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Explanation

Electronegative difference in KI is more

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According to valence-bond theory which magnetic property oxygen possess ?

Paramagnetic

Ferrimagnetic

Diamagnetic

Anti Ferromagnetic

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Explanation

According to valence-bond theory, oxygen molecule (O2) is paramagnetic. This is due to the presence of two unpaired electrons in its molecular orbital configuration, which makes it attracted to a magnetic field.

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Who was proposed valence-bond theory ?

A. Mulliken B. Lenus Pauling C. Hittler and Londan D. Hund

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In $H - C \equiv C - CH = CH_2 molecule C^3 - C^2$ single bond carbons has which type of hybridization ?

A. $ sp^2 -sp^3 $ B. $ sp - sp^2 $ C. Ssp^3 - sp $ D. $ sp^3 - sp^3 $

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Explanation

Here C - C contain double and triple bond

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Which of the following pair of species is isoelectronic and same structure ?

A. $NO_3 ^- , SO_3$ B. $ SO_3 , CO_3^{2-} $ C. $ CO_3 ^{2-} , ClO_3^- $ D. $ NO_3 ^- , CO_3 ^ {2-} $

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Explanation

$NO_3 ^ - and CO_3^ {2-} contains 32 e- so they are iso electric ions Both possess sp^2$ hybridization

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Which of the following sentence is incorrect for covalent bond ?

A. Strength of covalent bond depends upon overlapping at atomic orbitals. B. Covalent bond is not directional. C. There is sharing of electrons between atoms bonded by covalent bond D. Covalent bond is formed between atoms having less difference in their electronegativity.

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Explanation

Covalent bonds are directional because the shared electrons are located between the nuclei of the bonded atoms, which gives a specific orientation to the bond. This directionality is crucial for the formation of specific molecular shapes.

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Which of the following compound possesses covalent bond ?

$MgCl_2 $

NaH

$BF_3 $

CsCl

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Explanation

$BF_3$ (Boron Trifluoride) possesses covalent bonds. In $BF_3$, boron and fluorine atoms share electrons to form covalent bonds. The other compounds listed ($MgCl_2$, NaH, CsCl) have predominantly ionic bonds, where electrons are transferred rather than shared.

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Which of the following molecule possesses polar and nonpolar covalent bond ?

A. $NH_4 Cl $ B. $CCl_4 $ C. $H_2 O_2 $ D. HCN

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Which of the following compound does not possesses coordinate covalent bond ?

$SO_2 $

$HNO_2 $

$HNO_3 $

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Explanation

In $ HNO_2 $ O - H is polar , N = O is non-polar

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