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NEET Practice Questions (MCQs) with Answers & Solutions

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Number of nonbonding electron pair in $XeF_6, XeF_4 and XeF_2$ respectively

A. 2, 3, 1 B. 1, 3, 2 C. 3, 2, 1 D. 1, 2, 3

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Which of the following statement is incorrect for metallic bond ?

A. There is attraction between delocalised electrons and atomic karnel B. Directional property is shown by metal C. Delocalised electron can change their position easily in crystal D. Explanation of metallic bond can be given by 'electron sea model' S- Orbital

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Explanation

Metallic bonds are characterized by a 'sea of electrons' that are delocalized over a lattice of metal cations. The metallic bond is non-directional, meaning that the strength of the bond is the same in all directions, unlike covalent bonds which are directional. Therefore, the statement that 'Directional property is shown by metal' is incorrect.

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Number of H - bond form by unpaired electrons of liquid $NH_3 , H_2O and HF $ respectively are

3, 4, 2

4, 4, 2

3, 2, 1

1, 2, 1

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Explanation

Number of H - bond form by unpaired electrons of liquid NH3 , H2O and HF respectively are 1, 2, 1

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Which of the following pair is not in order for boiling point for 14, 15, 16 and 17 group ?

A. $H_2O \gt H_2S$ B. $ HF \gt HCl $ C. $CH_4 \gt SiH_4$ D. $NH_3 \gt PH_3$

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Explanation

The boiling points of compounds in groups 14, 15, 16, and 17 generally increase with increasing molecular weight and size. However, due to hydrogen bonding, there are exceptions. For example, $H_2O$ has a higher boiling point than $H_2S$, $HF$ has a higher boiling point than $HCl$, and $NH_3$ has a higher boiling point than $PH_3$. But $CH_4$ has a lower boiling point than $SiH_4$. So, the correct pair that is not in order is $CH_4 extgreater SiH_4$.

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Which of the following compound possesses ionic bond ?

A. $ CH_4$ B. $ SiCl_4$ C. $ BF_3 $ D. $ Mg Cl_2 $

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Explanation

Ionic bonds are formed between metals and non-metals due to the transfer of electrons. Among the given options, $MgCl_2$ (magnesium chloride) is an ionic compound because it is formed from magnesium (a metal) and chlorine (a non-metal). The other options are covalent compounds.

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Which of the following relation between BMO and ABMO electrons is correct for stability of diatomic malecule or ion ?

A. $ N_a \gt N_b$ B. $N_b \gt N_a$ C. $N_a + N_b = 0$ D. $N_a = N_b$

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At what distance van-derwaals attraction exist ?

A. $ 4.5 \times10 ^{-10} m $ B. 0.45nm C. $ 4.5 A ^\circ $ D. Given all

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What is bond energy of H-bond ?

A. $40 J mol^{-1} $ B. $ 40 KgJ mol^{-1} $ C. $ 40 cal. mol^{-1} $ D. $ 40 Kg cal mol^{-1} $

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Explanation

The bond energy of a hydrogen bond is typically around 40 kJ/mol. This value indicates the amount of energy required to break the hydrogen bond and is significantly stronger than van der Waals forces but weaker than covalent bonds. Hence, option o2 is correct.

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In which molecule inter molecular H-bond is possible ?

A. $CH_3COCH_3$ B. $ CH_4$ C. $SiH_4$ D. $NH_3$

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Explanation

Intermolecular hydrogen bonding is possible in molecules where hydrogen is directly bonded to highly electronegative atoms such as nitrogen, oxygen, or fluorine. In the given options, $NH_3$ (ammonia) has hydrogen atoms bonded to nitrogen, making intermolecular hydrogen bonding possible. Therefore, option o4 is correct.

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Which of the following characterstic does not possesses by metal ?

A. luminus B. ductility C. increase in conductance by increase in temperature D. malleability

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Explanation

Metals generally have high electrical conductivity, which typically decreases with an increase in temperature due to increased lattice vibrations. Thus, the characteristic of 'increase in conductance by increase in temperature' does not apply to metals.

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