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

22.22 gram of urea was dissolved in 300 grams of water. Calculate the number of moles of urea and molality of the urea solution. (Given: a Molar mass of urea = 60 gram mol^-1)

What is the action of carbon on the following metal oxides:

Fe₂O₃ in the blast furnace

What is the action of carbon on the following metal oxides :

ZnO in the vertical retort furnace

The number of primary and secondary hydroxyl groups in ribose are -

(a) 1, 3

(b) 2, 3

(c) 3, 1

(d) 3, 2

What is the action of p-toluenesulphonychloride on ethylamine and diethylamine?

What are amino acids?

Write the correct reaction for formation of the peptide bond between amino acids

Complete and rewrite the balanced chemical equations

Complete and rewrite the balanced chemical equations

Explain the cause of Lanthanoids contraction.

How are ethylamine and ethyl methyl amine distinguished by using nitrous acid?

What are isotonic solutions? Explain with one example.

What are antacids? 

Derive van’t Hoff general solution equation.

Distinguish between crystalline solids and amorsphous solids.

Classify the following molecular solids into different types: 

1. HCl
2. CO₂
3. Solid ice
4. SO₂

Define Anisotropy.

Write any ‘four points’ of difference between fluorine and other halogens.

What are elastomers? 

Distinguish between thermoplastic polymers and thermosetting polymers.