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The S-block Elements

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11 months ago

The S-block Elements Class 11th

Among the following statements, identify the correct set of statements:
(A) Size of Li is smaller than Mg
(B) Both Li and Mg form covalent compounds readily
(C) Both Li and Mg react with nitrogen and form nitride
(D) Oxides of Li and Mg do not combine with excess oxygen to give superoxides

Identify the correct option from below:
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New answer posted

11 months ago

The S-block Elements Class 11th

Among the nitrates of alkaline earth metals, the thermal stability of Mg(NO3)2 and Sr(NO3)2 respectively are:
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V
Vishal Baghel

Contributor-Level 10

Thermal stability of compound is directly proportional to large anion of s-block elements:

T.S ∝ 1/ (PP of cation)

And p.p. ∝ charge ∝ 1/size, So, [T.S. ∝ size ∝ 1/ (charge)]

So, Sr [NO? ]? is highly stable

But Mg (NO? )? ⇒ poor

New answer posted

11 months ago

The S-block Elements Class 11th

Which of the following combination will produce H2 gas ?
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V
Vishal Baghel

Contributor-Level 10

i. Zn + 2NaOH → Na? ZnO? + H?
ii. 4Au + 8NaCN + O? + 2H? O → 4Na [Au (CN)? ]+ 4NaOH
iii. Cu + 4HNO? → Cu (NO? )? + 2NO? + 2H? O
(conc.)

New answer posted

11 months ago

The S-block Elements Class 11th

Number of amphoteric compounds among the following is___________.

(a) BeO     (B) BaO                          (c) Be(OH)2                       (d) Sr(OH)2
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A
alok kumar singh

Contributor-Level 10

Beo & Be (OH)2 are amphoteric in nature, because they react with both acid and base

New answer posted

11 months ago

The S-block Elements Class 11th

Choose the correct answer from the options given below:
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A
alok kumar singh

Contributor-Level 10

(a) Li → used in bearings for motor engine.
(b) Na → used as coolant in fast breader nuclear reactor.
(c) K → used as absorbent of CO?
(d) Cs → used in photoelectric call.

New answer posted

11 months ago

The S-block Elements Class 11th

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: Metallic sodium dissolves in liquid ammonia giving a deep blue solution, which is paramagnetic.
Reason R: The deep blue solution is due to the formation of amide.

In the light of the above statements, choose the correct answer from the options given below:
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V
Vishal Baghel

Contributor-Level 10

The para-magnetism of solution of alkali metals in liquid ammonia and its deep blue color is due to ammoniated electrons. Which absorb energy in visible region of light.

New answer posted

11 months ago

The S-block Elements Class 11th

Which one of the following statements is correct?
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V
Vishal Baghel

Contributor-Level 10

Ca plays important role in Neuromuscular function and interneuronal transmission. The daily requirement of Mg and Ca in the human body is estimated to be 200 – 300mg. All enzymes that utilise ATP in phosphate transfer require Mg as the cofactor. The bone in human body is NOT an inert and unchanging substance.

New answer posted

11 months ago

The S-block Elements Class 11th

Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is :
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V
Vishal Baghel

Contributor-Level 10

BeCl? is covalent and soluble in a organic solvent

New answer posted

11 months ago

The S-block Elements Class 11th

Tritium, a radioactive isotope of hydrogen, emits which of the following particles?
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V
Vishal Baghel

Contributor-Level 10

Tritium is radioactive and emits low energy β? particles (? e? )

New answer posted

11 months ago

The S-block Elements Class 11th

Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are :
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V
Vishal Baghel

Contributor-Level 10

No. of atoms in Hexagonal primitive unit cell = 6
No. of Tetrahedral voids = 2 * No. of atoms per unit cell
= 2 * 6 = 12
No. of Octahedral voids = No. of atoms per unit cell = 6

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