HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

Identify A and B in the following reaction:

`CH_3-Br+Mg"dry ether"/""A+CO_2"dry ether"/(H^+/(H_2O))B+Mg(Br)OH`

How ligands are classified? Explain with suitable examples.

Explain the following term

Flux

The group 15 element having inner electronic configuration as of argon is-

(a) Phosphorous (z = 15)

(b) Antimony (z =51)

(c) Arsenic (z = 33)

(d) Nitrogen (z = 7)

Explain any two chemical methods of food preservation.

In Van Arkel method of refining metal, impure zirconium is converted to unstable volatile
compound by heating it with _______.

(A) oxygen

(B) chlorine

(C) bromine

(D) iodine

Define isotonic solutions.

Write electronic configuration and two uses of neon. (Z = 10)

Write the electronic configuration of the following element:

Krypton (Z = 36)

Write cathode and anode reaction in a fuel cell.

The oxidation state of nitrogen in dinitrogen trioxide is ____

(a) + 1

(b) + 2

(c) + 3

(d) + 4

Baeyer’s reagent is -'

(a) acidified potassium dichromate

(b) alkaline potassium dichromate

(c) alkaline potassium permanganate

(d) acidified potassium permanganate

Why ethanol has the higher boiling point than ethane?

Write a chemical equation for the action of neutral ferric chloride on phenol.

Draw the structures of adenine.

What are isotonic solutions? Explain with one example.

A compound used as pistachio flavour in ice cream is ___________

A compound used as pistachio flavour in ice cream is ___________

Oxidation states of scandium are ___________.

In Van Arkel method for refining zirconium or titanium, the halogen used is __________.