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5 months ago

Class 12th Chemistry

100ml of 0.0018% (w/v) solution of Cl- ion was the minimum concentration of Cl- required to precipitate a negative sol in one h. THE coagulating value of Cl- ion is_________.

(Nearest integer)
0 Follower 2 Views

V
Vishal Baghel

Contributor-Level 10

Wt of Cl- in 100 ml = 1.8 * 10-3 gm

Mol. of Cl- in 100 ml = 1 . 8 * 1 0 − 3 3 5 . 5 = 0 . 0 5 0 7 * 1 0 − 3 m o l e  

∴ [ C l − ] = 0 . 0 5 0 7 * 1 0 − 3 * 1 0 0 0 1 0 0 = 5 . 0 7 * 1 0 − 4 M   

i.e. 0.507 milli mole in one lit required in one hr.

Coagulation value = (millimole/lit) required in one hr = 0.507

= 1 (the nearest integer)

New answer posted

5 months ago

Class 12th Chemistry

The wavelength of electrons accelerated from rest through a potential difference of 40 kV is x * 10-12m. The value of x is________. (Nearest Integer)

Given : Mass of electron = 9.1 * 10-31kg

Charge on an electron = 1.6 * 10-19C

Planck's constant = 6.63 * 10-34Js
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V
Vishal Baghel

Contributor-Level 10

Here, λ = h 2 * m * e V = 6 . 6 3 * 1 0 − 3 4 2 * 1 . 6 * 1 0 − 1 9 * 4 0 0 0 0 * 9 . 1 * 1 0 − 3 1 m  

∴ λ = 0 . 6 1 4 * 1 0 − 1 1 m  

λ = 6 . 1 4 * 1 0 − 1 2 m [the nearest integer = 6]

New answer posted

5 months ago

Class 12th Chemistry

When 0.15g of an organic compound was analyzed using carius method for estimation of bromine, 0.2397g of AgBr was obtained. The percentage of bromine in the organic compound is_________. (Nearest Integer) (Atomic mass: Ag = 108, Br = 80)
0 Follower 3 Views

V
Vishal Baghel

Contributor-Level 10

0.15 gm (organic compounds) → A g N O 3 A g B r ( s )

↓                                                                    

0.2397 gm

Weight of Br in AgBr = ( 8 0 1 8 8 * 0 . 2 3 9 7 ) = 0 . 1 0 2 g m

% Br in compound = 0 . 1 0 2 * 1 0 0 0 . 1 5 = 6 8 %

New question posted

5 months ago

Class 12th Chemistry

When 0.15g of an organic compound was analyzed using carius method for estimation of bromine, 0.2397g of AgBr was obtained. The percentage of bromine in the organic compound is_________. (Nearest Integer) (Atomic mass: Ag = 108, Br = 80)
0 Follower 1 View

New answer posted

5 months ago

Class 12th Chemistry Organic Chemistry

Benzene on nitration givens nitrobenzene in presence of HNO3 and H2SO4 mixture, where:
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Vishal Baghel

Contributor-Level 10

Due to the larger acid dissociation constant (Ka) sulphuric acid acts as an acid and HNO3 acts as a base.

New answer posted

5 months ago

Class 12th Chemistry

The major product (P) in the following reaction is:
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V
Vishal Baghel

Contributor-Level 10

Kindly consider the following figure

New answer posted

5 months ago

Class 12th Chemistry

Metallic sodium does no react normally with:
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V
Vishal Baghel

Contributor-Level 10

Due to the absence of acidic hydrogen in But – 2-yne, metallic sodium does not react with this.

New answer posted

5 months ago

Class 12th Chemistry

Orlon fibres are made up of:
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A
alok kumar singh

Contributor-Level 10

Orlon fibres are the polymer of acrylonitrile

 

New answer posted

5 months ago

Class 12th Chemistry

In the given reaction 3-Bromo-2, 2-dimethyl butane  → C 2 H 5 O H ' A ' ( M a j o r     P r o d u c t ) Product A is:
0 Follower 3 Views

A
alok kumar singh

Contributor-Level 10

Kindly go through the solution

 

New answer posted

5 months ago

Class 12th Organic Chemistry - Some Basic Principles and Tech

Which one of the following pairs of isomers is an example of metamerism?
0 Follower 18 Views

V
Vishal Baghel

Contributor-Level 10

In metamers, distribution of alkyl groups are changed with respect to polyvalent functional groups.

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