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Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter One

Borazine, also known as inorganic benzene, can be prepared by the reaction of 3-equivalents of “X” with 6-equivalents of “Y”. 'X' and “Y”, respectively are:

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Vishal Baghel

Contributor-Level 10

$B_{2} H_{6} + N H_{3} \to_{}^{H i g h T e m p e r a t u r e} B_{3} N_{3} H_{6} (B o r a z i n e)$

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Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter One

Reaction of BeCl₂ with LiAlH₄ gives:

(A) AlCl₃

(B) BeH₂

(C) LiH

(D) LiCl

(E) BeAlH₄

Choose the correct answer from options given below:

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Vishal Baghel

Contributor-Level 10

$2 B e C l_{2} + L i A l H_{4} \to 2 B e H_{2} + L i C l + A l C l_{3}$

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Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

Given below are two statements : one is labeled as Assertion A and the other is labeled as Reason R.

Assertion A: Phenolphthalein is pH dependent indicator, remains colourless in acidic solution and gives pink colour in basic medium.

Reason R: Phenolphthalein is a weak acid. It doesn't dissociate in basic medium.

In the light of the above statements, choose the most appropriate answer from the options given below.

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alok kumar singh

Contributor-Level 10

Phenolphtalein is a pH dependant indicator. It is a weak acid which is colourless in acidic medium but gives pink colour in basic medium. The pink colour is due to its conjugate form. Phenolphthalein dissociates in basic medium. Therefore, assertion is true but reason is false.

$\underset{(C o l o u r l e s s)}{H P h (a q .)} ? H^{+} + \underset{(P i n k)}{P h^{-}}$

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Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter One

Which of the following can be used to prevent the decomposition of H₂SO₄?

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Vishal Baghel

Contributor-Level 10

Urea acts as negative catalyst for decomposition of H₂O₂.

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Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter One

Refining using liquation method is the most suitable for metals with:

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Vishal Baghel

Contributor-Level 10

Liquation process is used for purification of that metal, whose melting point is lesser then that of impurities.

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Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter One

Given two statements below:

Statement I : In Cl₂ molecules the covalent radius is double of the atomic radius of chlorine.

Statement II : Radius of anionic species is always greater than their parent atomic radius.

Choose the most appropriate answer from options given below:

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Vishal Baghel

Contributor-Level 10

Ionic radius of Cl^- = 167 pm

Covalne radius of Cl = 99 pm

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Chemistry Chemistry NCERT Exemplar Solutions Class 12th Chapter One

Match List I with List II:

List-I (Processes/Reactions)	List-II (Catalyst)
(A) 2SO₂(g) + O₂(g) -->2SO₃(g)	(I) Fe(s)
(B) 4NH₃(g) + 5O₂(g)--> 4NO(g) + 6H₂O(g)	(II) Pt(s) – Rh(s)
(C) N₂(g) + 3H₂(g) --> 2NH₃(g)	(III) V₂O₅
(D) Vegetable oil (I) + H₂ --> Vegetable ghee(s)	(IV) Ni(S)