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

Explain the acidic nature of carboxylic acids.

Write reactions for the action of the following reagents on p-chlorobenzaldehyde.

Ethane-1,2-diol in presence of dry HCl.

Complete the following sequence of reactions and write structures for A, B, C.

\[\ce{Dry ice ->[i. Dry ether][ii. Hydrolysis] A ->[PCl5] B ->[H2(gas)][Pd - BaSO4] C}\]

Aniline on reaction with bromine water produces ________________

The gas evolved when sulfuric acid reacts with copper metal _______.

Hot and concentrated alkali NaOH reacts with chlorine to form _______.

When SO₂ is passed through an aqueous solution of I₂, the solution becomes _______.

What is the action of chlorine on cold and dilute sodium hydroxide.

What is the action of chlorine on hot and concentrated sodium hydroxide?

Write the chemical reaction of action of Cl₂ on excess NH₃.

What happens when chlorine reacts with?

Al

What happens when chlorine reacts with?

Na

What happens when chlorine reacts with?

S₈

What happens when chlorine reacts with?

P₄

Define the Enthalpy of sublimation.

Define the Enthalpy of vaporization.

Why work done in vacuum is zero?

Define the Enthalpy of atomization.

Which nanoparticles act as highly effective bacterial disinfectant, removing E.Coli from water?

Name the plant which is an example of self-cleaning.