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The S-block Elements

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3 months ago

The S-block Elements Class 11th

In the industrial production of which of the following, molecular hydrogen is obtained as a by product?

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alok kumar singh

Contributor-Level 10

NaOH is obtained by electrolysis of NaCl. Solution of NaCl using Hg cathode

$\begin{array}{l} C a t h o d e : N a^{+} + e \to_{}^{H g} N a - A m a l g a m \\ A n o d e : 2 C l^{-} \to C l_{2} + 2 e \\ 2 N a - A m a l g a m + 2 H_{2} O \to 2 N a O H + 2 H g + H_{2} \end{array}$

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The S-block Elements Class 11th

Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be

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alok kumar singh

Contributor-Level 10

Metal Ag Ga Cs Hg

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The S-block Elements Class 11th

Which of the following statements are correct?

(A) Both LiCl and MgCl₂ are soluble in ethanol

(B) The oxides Li₂O and MgO combine with excess of oxygen to give superoxide.

(C) LiF is less soluble in water than other alkali metal fluorides.

(D) Li₂O is more soluble in water than other alkali metal oxides.

Choose the most appropriate answer from the options given below :

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Vishal Baghel

Contributor-Level 10

Due to higher extent of polarization by Li⁺ and Mg²⁺, LiCl and Mgcl₂ have covalent character. Therefore they are soluble in ethanol.

Due to very high value of lattice energy, LiF is having very less solubility in water.

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The S-block Elements Class 11th

In the metallurgical extraction of copper, following reaction is used:

FeO + SiO₂ ® FeSiO₃

FeO and FeSiO₃

FeO and FeSiO₃ respectively are.

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alok kumar singh

Contributor-Level 10

In extraction of copper from copper pyrite (CuFeS₂).

FeS converted to FeO as;

$\underset{G a n g u e}{2 F e S} + 3 O_{2} \overset{Δ}{\to} \underset{G a n g u e}{2 F e O} + 2 S O_{2}$

Then FeO is removed as slag by given reaction

FeO + SiO₂ ® $\underset{S l a g}{F e S i O_{3}}$

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4 months ago

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

Which of the following sets are correct regarding polymer?

(A) Copolymer: Buna-S

(B) Condensation polymer: Nylon-6,6

(C) Fibres: Nylon-6,6

(D) Thermosetting polymer: Terylene

(E) Homopolymer: Buna-N

Choose the correct answer form given options below

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Payal Gupta

Contributor-Level 10

Buna-S is the copolymer of butadiene and styrene, Nylon-6, 6 is the condensation polymer of adipic acid and diamine and having fibrous nature.

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

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

Match List – I with List – II

List – I List – II

(Metal)

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alok kumar singh

Contributor-Level 10

Metals Li Na K Rb Cs

Colour Crimson red Yellow Violet Red violet Blue

Wavelength 670.8 589.2 766.5 &nbs

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

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

Assertion A: LiF is sparingly soluble in wate.

Reason R: The ionic radius of Li⁺ ion is smallest among its group members, hence has least hydration enthalpy.

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

Due to high lattice energy, LiF is sparingly soluble in water. Li+ has high hydration energy among its group members due to the smallest size.

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

The metal that has very low melting point and its periodic position is closer to a metalloid is

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alok kumar singh

Contributor-Level 10

Element Melting Point

Al 933 K

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