The S-block Elements
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2 months agoNew answer posted
2 months agoContributor-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
2 months agoContributor-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
2 months agoContributor-Level 10
Beo & Be (OH)2 are amphoteric in nature, because they react with both acid and base
New answer posted
2 months ago
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
2 months agoContributor-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
2 months agoContributor-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
2 months agoNew answer posted
2 months agoContributor-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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