Chemistry NCERT Exemplar Solutions Class 11th Chapter Nine

This is a matching answer type question as classified in NCERT Exemplar

(i)→ (e); (ii)→ (d); (iii)→ (b); (iv)→ (a); (v)→ (c)

This is a matching answer type question as classified in NCERT Exemplar

(i)→ (d); (ii)→ (b); (iii)→ (c); (iv)→ (a)

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(i) → (j); (ii) → (h); (iii) → (f) : (iv) → (a); (v) → (b); (vi) → (e)

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Option (i), (ii) and (iii)

Ionic hydrides are crystalline, non-volatile and non-conducting in solid state

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Option (i) and (iv)

All elements in group 13 are Lewis acids because they form electron-deficient compounds. Excess electrons are found as lone pairs in electron-rich hydrides.

These compounds are made up of elements from groups 15-17. (NH₃ has one lone pair, H₂O has two, and HF has three.) As a result, they act as Lewis bases.

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Option (ii) and (iii)

Electron precise hydrides have the required number of electrons to write their conventional Lewis structures. All elements of group 14 form such compounds (e.g., CH₄) which are tetrahedral in geometry.

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Option (i) and (ii)

Presence of calcium and magnesium salts in the form of hydrogen carbonate, chloride and sulphate in water makes water 'hard'.

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Option (iii) and (iv)

The presence of extensive hydrogen bonding between water molecules gives it remarkable features in the condensed phase (liquid and solid phases). In comparison to H₂S and H₂Se, this results in a high freezing point, high boiling point, high heat of vaporisation, and high heat of fusion.

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Option (i) and (ii)

When an electron is removed from a hydrogen atom, the nucleus decreases to 1.5 * 10^-3 pm in size. When compared to usual atomic and ionic sizes of 50 to 200 pm, this is exceedingly small. As a result, H+ does not exist independently and is always bound to other atoms or molecules.

This is a multiple choice answer as classified in NCERT Exemplar

Option (i) and (iii)

Heavy water is utilised as a moderator in nuclear reactors and exchange reactions, and it is more associated with water due to its higher mass.