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Chemistry Solutions

When 3.00 g of substance 'X" is dissolved in 100 g of CCl₄, it raises the boiling point by 0.60K. The molar mass of the substance 'X" is __________g mol⁻¹. (nearest integer)
[Given Kb for CCl₄ is 5.0 K kg mol⁻¹]

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alok kumar singh

Contributor-Level 10

ΔTb = 0.6 K
ΔTb = Kb * m = Kb * (wt. * 1000)/ (mol wt. * Wsolvent (gm)
0.6 = 5 * (3 * 1000)/ (mol wt. * 100)
∴ mol wt. = (15 * 10)/ (0.6) = 1500/6
= 250 g/mole

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Chemistry Class 11th

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Lithium halides are some what covalent is nature.
Reason R: Lithium possess high polarisation capability.
In the light of the above statements, choose the most appropriate answer from the options given below:

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Vishal Baghel

Contributor-Level 10

Due to small size Li have more polarizing power so most of the compound of Li are covalent.

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Chemistry Class 12th

Which one of the following species responds to an external magnetic field?

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Raj Pandey

Contributor-Level 9

(CH?)?N?HCl produces H? which reacts with NaHCO? and CO? gas evolved, because HCl is stronger acid than H?CO?

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Chemistry Chemistry Chemical Kinetics

For a chemical reaction A→B, it was found that concentration of B is increased by 0.2 mol L⁻¹ in 30 min. The average rate of the reaction is __________ *10⁻¹ mol L⁻¹ h⁻¹. (in nearest integer)

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alok kumar singh

Contributor-Level 10

A → B
t=0: a, 0
t=30min: (a-x), x
given x = 0.2 mole / lit
Average rate = +Δ [B]/Δt = 0.2 mole/lit / (30/60)h = 0.4 mole lit? ¹h? ¹
= 4 * 10? ¹ mole lit? ¹h? ¹

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Chemistry Chemistry Organic Chemistry

The correct order of stability of given carbocations is:

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Vishal Baghel

Contributor-Level 10

Order of stability is,

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Chemistry Class 11th

Assuming that Ba(OH)₂ is completely ionized in aqueous solution under the given conditions the concentration of H₃O⁺ ions in 0.005 M aqueous solution of Ba(OH)₂ at 298 K is __________ * 10⁻¹² mol L⁻¹. (nearest integer)

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alok kumar singh

Contributor-Level 10

Ba (OH)? ? Ba? ² + 2 (OH)?
Initial: 0.005M, 0, 0
Final: 0, 0.005, 0.010
[OH? ] = 0.01 M = 10? ² M
Kw = [H? ] [OH? ]
[H? ] or [H? O? ] = Kw/ [OH? ] = 10? ¹? /10? ² = 10? ¹² M
∴ [H? O? ] = 1 * 10? ¹² M

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Chemistry Class 12th