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Chemistry NCERT Exemplar Solutions Class 12th Chapter Two

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2 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Two General Principles & Processes of Isolating Elemen

The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?

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Vishal Baghel

Contributor-Level 10

$C e^{3 +} \to [X e] 4 f^{1} 5 d^{0}$

$C e^{4 +} \to [X e] 4 f^{0} 5 d^{0}$ (Noble gas configuration)

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2 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Two Surface Chemistry

Which one of the following is an example of disproportionation reaction?

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Vishal Baghel

Contributor-Level 10

Disproportionation reaction is

$\overset{+ 6}{M g} O_{4}^{- -} + 4 H^{+} \to 2 \overset{+ 7}{M n} O_{4}^{-} + \overset{+ 4}{M n} O_{2} + 2 H_{2} O$

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2 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Two The S-block Elements

The oxide which contains an odd electron at the nitrogen atom is

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Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

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2 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Two Redox Reactions

s-block element which cannot be qualitatively confirmed by the flame test is

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Vishal Baghel

Contributor-Level 10

Be does not perform in flame colouration due to highly ionization energy.

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2 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Two Equilibrium

Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to

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Vishal Baghel

Contributor-Level 10

During removal of temporary hardness of water.

$\begin{array}{l} M g {(H C O_{3})}_{2} \overset{B o i l}{\to} M g {(O H)}_{2} + 2 C O_{2} ↑ \\ C a {(H C O_{3})}_{2} \overset{B o i l}{\to} C a C O_{3} + H_{2} O + C O_{2} \end{array}$

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2 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Two Chemical Bonding and Molecular Structure

The role depressants in 'Froth Floatation method' is to

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Vishal Baghel

Contributor-Level 10

In sulphide ore, depressants selectively prevent impurity from coming to the fourth.

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2 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Two Classification of Elements and Periodicity in Prop

Which of the following elements is considered as a metalloid?

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Vishal Baghel

Contributor-Level 10

Except Te, all are metals.

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2 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Two Structure of Atom

Match List I with List II

List I Enzyme	List II Conversion of
A. Invertase	I. Starch into maltose
B. Zymase	II. Maltose into glucose
C. Diastase	III. Glucose into ethanol
D. Maltase	IV. Cane sugar into glucose

Choose the most appropriate answer from the options given below:

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Vishal Baghel

Contributor-Level 10

Invertase Cane sugar to glucose and fructose

Zymase Glucose to ethanol

Diastase Starch to Maltose

Maltase Maltose to glucose

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2 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Two Some Basic Concepts of Chemistry

The number of radial land angular nodes in 4d orbital are, respectively

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Vishal Baghel

Contributor-Level 10

In 4d orbital, n = 4 and $l = 2$

Radial nodes = $n - l - 1$

Radial nodes = 4 – 2 – 1 = 1

And angular nodes, $l = 2$

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2 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Two Structure of Atom

Which of the following statements are correct?

(A) The electronic configuration of Cr is [Ar] 3d⁵4s¹.

(B) The magnetic quantum number may a negative value.

(C) In the ground state of an atom, the orbitals are filled in order of their increasing energies.

(D) The total number of nodes are given by (n-2)

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alok kumar singh

Contributor-Level 10

(A) Cr = [Ar]3d⁵4s¹

(B) m = $- l t o + l$

(C) According to Aufbau principle, orbital are filled in order of their increasing energies.

(D) Total nodes = n – 1

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