Class 12th

Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (ii), (iii)

MI > MBr > MCl > MF is an iconic character of metal halide

F₂ > Cl₂ > Br₂ > I₂ is a bond dissociation enthalpy

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7 months ago

If $A = {a, b, c, d}$ and the function $f = {(a, b), (b, d), (c, a), (d, c)}$ , write $f^{- 1}$

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Contributor-Level 10

This is a Short Answer Type Question as classified in NCERT Exemplar

Sol:

$\begin{array}{l} G i v e n t h a t, A = {a, b, c, d} \end{array}$

$\begin{array}{l} a n d f = {(a, b), (b, d), (c, a), (d, c)} \end{array}$

$\begin{array}{l} f^{- 1} = {(b, a), (d, b), (a, c), (c, d)} \end{array}$

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7 months ago

Let $f : R \to R$ be the function defined by $f (x) = 2 x - 3, \forall x \in R$ Write $f^{- 1}$ .

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Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

Contributor-Level 10

This is a Short Answer Type Question as classified in NCERT Exemplar

Sol:

$\begin{array}{l} \begin{array}{l} f (x) = 2 x - 3 \end{array} \end{array}$

$\begin{array}{l} \begin{array}{l} L e t f (x) = y = 2 x - 3 \end{array} \\ \Rightarrow y + 3 = 2 x \Rightarrow x = \frac{y ? + 3}{2} \\ ∴ f^{- 1} (y) = \frac{y + 3}{2} 0 r f^{- 1} (x) = \frac{x + 3}{2} \end{array}$

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7 months ago

If chlorine gas is passed through hot NaOH solution, two changes are observed in the oxidation number of chlorine during the reaction. These are ________ and _________.

(i) 0 to +5

(ii) 0 to +3

(iii) 0 to –1

(iv) 0 to +1

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Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (i) and (iii)

6NaOH+3Cl₂ → 5NaCl+NaClO₃+3H₂O

Chlorine gas oxidation number ranges from 0 to –1 to 0 to +5.

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Let $f, g : R \to R$ be defined by $f (x) = 2 x + 1$ and $g (x) = x^{2} - 2$ , $\forall x \in R$ .

Respectively then, Find $g \circ f$ .

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Contributor-Level 10

This is a Short Answer Type Question as classified in NCERT Exemplar

Sol:

$\begin{array}{l} f (x) = 2 x + 1 a n d g (x) = x^{2} - 2 \\ ∴ g o f = g [f (x)] \\ = {[2 x + 1]}^{2} - 2 \\ = 4 x^{2} + 4 x + 1 - 2 \\ = 4 x^{2} + 4 x - 1 \\ H e n c e, g o f = 4 x^{2} + 4 x - 1 . \end{array}$

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7 months ago

Kindly consider the following

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Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

Contributor-Level 10

This is a Short Answer Type Question as classified in NCERT Exemplar

Sol:

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7 months ago

Which of the following is an isoelectronic pair?

(i) ICl₂ , ClO₂

(ii) BrO₂^- , BrF₂

(iii) ClO₂ , BrF

(iv) CN^- , O₃

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Class 12th Maths NCERT Exemplar Solutions Class 12th Chapter One

Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (ii)

BrO₂^- (35+2*8+1=52) and BrF₂⁺ (35+2*9−1=52)

52 electrons are present in both

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7 months ago

Let $A = {a, b, c}$ and the relation $R$ be defined on $A$ as follows:

$R = {(a, a), (b, c), (a, b)}$ .

Then, write minimum number of ordered pairs to be added in $R$ to make $R$ reflexive and transitive.

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Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

Contributor-Level 10

This is a Short Answer Type Question as classified in NCERT Exemplar

Sol: R = { (a, a), (b, c), (a, b)}.

To make R as reflexive we must add (b, b) and (c, c) to R. Also, to make R as transitive we must add

(a, c) to R.

So, minimum number of ordered pair is to be added are (b, b), (c, c), (a, c).

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7 months ago

Reduction potentials of some ions are given below. Arrange them in decreasing order of oxidising power.

(i) ClO₄^- > IO₄^- > BrO₄^-

(ii) IO₄^- > BrO₄^- > ClO₄^-

(iii) BrO₄^- > IO₄^- > ClO₄^-

(iv) BrO₄^- > ClO₄^- > IO₄^-

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Class 12th Chemistry NCERT Exemplar Solutions Class 12th Chapter Seven

Contributor-Level 10

This is a multiple choice answer as classified in NCERT Exemplar

Correct option is (iii)

The ability of a substance to be decreased is known as its reduction potential. As the substance's reduction potential rises, so does its power to reduce. It signifies the chemical's oxidising power (the ability of the material to cause other substances to lose electrons, which is known as oxidising power) grows.

As a result, the oxidising power is listed in decreasing order BrO₄^- > IO₄^- > ClO₄^-

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7 months ago

In solid state PCl₅is a _________.

(i) Covalent solid

(ii) Octahedral structure

(iii) Ionic solid with [PCl₆]⁺ octahedral and [PCl₄]⁻ tetrahedral

(iv) Ionic solid with [PCl₄]⁺ tetrahedral and [PCl₆]⁻ octahedral

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