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Class 12th

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New answer posted

a month ago

Class 12th Biomolecules

How many of the following vitamins are stored in Human Body?

A, B, C, D, E, K?
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

A, D, E, K vitamins are fat soluble vitamins, are stored in liver and adipose tissue.

While vitamin B and vitamin C are water soluble and must be supplied regularly in diet (not stored) (except vitamin B12)  

New answer posted

a month ago

Class 12th Chemistry Chemical Kinetics

Half life of a first order reaction is 36 hr. Find out time (in hr) required for concentration of reactant to get reduced by 90%.
0 Follower 2 Views

A
alok kumar singh

Contributor-Level 10

t 9 0 = 2 . 3 0 3 k l o g ( 1 0 0 1 0 0 − 9 0 )

= 2 . 3 0 3 * 3 6 2 . 3 0 3 * l o g 2 * l o g 1 0 = 3 6 0 . 3 = 1 2 0

New answer posted

a month ago

Class 12th Chemistry

Consider the following reaction.

Select P

(Where Me is CH3)

 
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

is an example of azo coupling reaction and final product is methyl orange.

 

New answer posted

a month ago

Class 12th Chemistry

Statement-I : Aniline on reaction with concentrated H2SO4 at 475 K gives p-amino benzene sulphonic acid. This gives blood red colour with Lassaigne's test.

Statement-II : Aniline forms a salt with anhydrous AlCl3 in Friedel Craft's reaction.
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

p-amino benzene sulphonic acid contains both N and S, so it gives blood red colour with Lassaigne's test.

New answer posted

a month ago

Class 12th Chemistry

What will be the reactivity order of following compounds towards electrophilic substitution reaction?
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

Kindly go through the images

 

New answer posted

a month ago

Class 12th Chemistry

Consider the following reaction

A and B respectively are

 

 
0 Follower 1 View

A
alok kumar singh

Contributor-Level 10

Kindly go through the solution

 

New answer posted

a month ago

Class 12th Chemistry

Choose the correct answers.

(A) Mn2O7 is a oil at room temperature.

(B) V2O4 react with acid to give VO2+

(C) CrO is a basic oxide

(D) V2O5 does not react with acids.
0 Follower 3 Views

A
alok kumar singh

Contributor-Level 10

A, B and C are correct.

Mn2O7 is a green oil at room temperature.

V2O4 react with acids to give VO2+.

CrO is Basic and CrO3 is acidic.

V2O5 react with acids as well as alkali.

New answer posted

a month ago

Class 12th Chemistry

Identify the given reaction

 
0 Follower 2 Views

A
alok kumar singh

Contributor-Level 10

The given reaction is Gattemann Koch reaction.

New answer posted

a month ago

Class 12th Chemistry

What is the major product formed in the following reaction?

 
0 Follower 3 Views

A
alok kumar singh

Contributor-Level 10

Kindly go through the image

 

New answer posted

a month ago

Class 12th Chemistry

What is the product formed in the below given reaction?

 
0 Follower 2 Views

A
alok kumar singh

Contributor-Level 10

Kindly go through the image

 

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