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

Define the half-life of a first-order reaction.

On which electrode the oxidation reaction takes place?

How ketones are prepared from nitriles?

Why alkyl halides though polar are immiscible with water?

What is Henry's law?

Which of the following correctly represents integrated rate law equation for a first order reaction in a gas phase?

Ozonolysis of 2, 3 dimethyl but-2-ene, followed by decomposition by Zn dust and water gives ______.

Calculate the work done during the expansion of 2 moles of an ideal gas from 10 dm³ to 20 dm³ at 298 K in a vacuum.

Explain anomalous behaviour of oxygen in group 16 with respect to:

1. Atomicity
2. Magnetic property
3. Oxidation state

A pair of coloured ions is ______.

Explain why the anode is of negative polarity in a galvanic cell.

Write a note on Kolbe's reaction

What is the action of nitrous acid on aniline?

Complete the following reaction:

\[\ce{Na2SO3 + Cl2 + H2O -> \underline{}\underline{}\underline{}\underline{} + \underline{}\underline{}\underline{}\underline{}}\]

What is the action of hydrogen cyanide on the following?

Benzaldehyde

Oxygen is highly soluble in blood. Give reason.

What are integrated rate laws?

Arrange O - H, C - H and N - H bonds in increasing order of their bond polarity.

How does entropy change in the following process? Explain.

Dissolving sugar in water

Explain the magnetic properties of d-block (or transition) elements.