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CBSE chemistry

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Question
CBSEENCH12010385
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What is the reason fo the stability of colloidal sols ?

Solution

In colloidal sols, the colloidal particles carry a particular charge and the dispersion medium carries an equal but opposite charge. Due to the presence of these similar and equal charges, the particles of the colloid sol  repel one another and cannot combine together to form larger particles which keep them dispersed in the medium and the colloidal remains stable.

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Question
CBSEENCH12010386
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Given an example each of molecular solid and an ionic solid.

Solution

(i)  Molecular Solid   - I2

(ii)  Ionic Solid  - NaCl

Question
CBSEENCH12010387
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Pb(NO3)2 on heating gives a brown gas which undergoes dimerization on cooling ? Identify the gas.

Solution

2 Pb left parenthesis NO subscript 3 right parenthesis subscript 2 space left parenthesis straight s right parenthesis space rightwards arrow with increment on top space 2 PbO space left parenthesis straight s right parenthesis space plus 4 NO subscript 2 left parenthesis straight g right parenthesis space
Nitrogen dioxide gas evolved.

Question
CBSEENCH12010390
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When coordination compound CoCl3.6NH3 is mixed with AgNO3, 3molesof AgCl is precipitated per mole of the compound. write
i) Structural formula of the complex
ii) IUPAC name of the complex

Solution

(i)  [Co (NH3)6] Cl3

(ii) Hexaamminecobalt(III) chloride

Question
CBSEENCH12010391
Wired Faculty App

(i) Gas (A) is more soluble in water than Gas (B) at the same temperature which one of two gases will the higher value of KH (Henry's constant) and why ?

(ii)In non-ideal solution, what type of deviation shows the formation of maximum boiling azeotropes?

Solution

(i)According to Henry's law , at the constant temperature, the solubility of the gas in a liquid is directly proportional to the partial pressure of the gas on the surface of the liquid or solution. Gas B  has a Higher value of KH and thus lower is the solubility of the gas.
p = KHx
(ii) Negative deviation from Raoult’s law

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