HSC Science Class 11 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

Starting from CH₃MgI, How will you prepare the following?

Acetic acid

Starting from CH₃MgI, How will you prepare the following?

Acetone

Starting from CH₃MgI, How will you prepare the following?

Methyl cyanide

Complete the following reaction.

\[\ce{CCl4 + H2O ->[\Delta]}\]

An organic compound (A) with molecular formula C₂H₅Cl reacts with KOH gives compounds (B) and with alcoholic KOH gives compound (C). Identify (A), (B), (C).

The gaseous envelope around the earth is known as atmosphere. The region lying between an altitudes of 11 – 50 km is _______.

Ozone depletion will cause ______.

Assertion (A): Oxygen plays a key role in the troposphere.

Reason (R): Troposphere is not responsible for all biological activities.

Which is considered to be the earth’s protective umbrella? Why?

On the basis of chemical reactions involved, explain how do CFC’s cause depletion of ozone layer in stratosphere?

Carbon forms two oxides, namely carbon monoxide and carbon dioxide. The equivalent mass of which element remains constant?

Hot concentrated sulphuric acid is a moderately strong oxidising agent. Which of the following reactions does not show oxidising behaviour?

The equivalent mass of potassium permanganate in alkaline medium is \[\ce{MnO^-_4 + 2H2O + 3e^- -> MnO2 + 4OH^-}\]

The equivalent mass of ferrous oxalate is

Define equivalent mass.

The energy of light of wavelength 45 nm is

The energies E₁ and E₂ of the two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths ie λ₁ and λ₂ will be

Based on equation E = `-2.178 xx 10^(-18) "J" ("z"^2/"n"^2)`, certain conclusions are written. Which of them is not correct?

Which of the following pairs of d-orbitals will have electron density along the axes?

Two electrons occupying the same orbital are distinguished by __________.