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

Calculate total moles after dissociation in 0.1 M KCl solution and 0.05 M aluminium sulphate solution. Hence, decide which of the two solutions will have higher freezing point depression.

Explain with vapour pressure-temperature curves that the freezing point of a solvent is lowered by dissolving a nonvolatile solute into it. Give reason for such lowering of freezing of solvent.

Correct order of acid strength for

1. acetic acid
2. fluoroacetic acid
3. 4-Nitrobenzoic acid 
4. 4-Methyl benzoic acid is ______.

In construction of Standard Hydrogen Electrode, platinum acts as ______.

For hydrogen gas electrode, `"E"_("H"_2)` is calculated through to Nernst equation, where `"E"_("H"_2)^0` is always _______.

Write the structure of the product formed when carboxylic acid is heated with a dehydrating agent like P₂O₅

Write the reducing agent which CANNOT reduce –COOH group.

Mention difficulties in settings Standard Hydrogen Electrode.

What is the action of following on proponal?

Hydroxyl amine

What is the action of following on proponal?

Hydrazine

Write the preparation reactions for acid amide from the following.

Carboxylic acid

Write the preparation reactions for acid amide from the following.

Acid chloride

Draw a neat and well labelled diagram of Standard Hydrogen Electrode. Also write its one application.

Write reactions for the following conversions.

Propanone to Propane

Write reactions for the following conversions.

4-Nitrobenzoic acid to Nitrobenzene

Write chemical reactions to convert –COOH group of acetic acid into the following.

CH₄

Write chemical reactions to convert –COOH group of acetic acid into the following.

C₂H₅OH

Write chemical reactions to convert –COOH group of acetic acid into the following.

CH₃COCl

Write reaction for preparation of acetophenone from benzoyl chloride.

Explain the acidic nature of carboxylic acids.