Science (English Medium) इयत्ता ११ - CBSE Question Bank Solutions

List the quantum numbers (m_l and l) of electrons for 3d orbital.

 Which of the following orbitals are possible?

1p, 2s, 2p and 3f

Indicate the number of unpaired electrons in a P.

Indicate the number of unpaired electrons in Si.

Indicate the number of unpaired electrons in Cr.

Indicate the number of unpaired electrons in Fe.

Indicate the number of unpaired electrons in Kr.

Write the important conditions required for the linear combination of atomic orbitals to form molecular orbitals.

Discuss the chemistry of Lassaigne’s test.

Why is a solution of potassium hydroxide used to absorb carbon dioxide evolved during the estimation of carbon present in an organic compound?

The concentration of hydrogen ion in a sample of soft drink is 3.8 × 10^–3 M. what is its pH?

The pH of a sample of vinegar is 3.76. Calculate the concentration of hydrogen ion in it.

It has been found that the pH of a 0.01M solution of an organic acid is 4.15. Calculate the concentration of the anion, the ionization constant of the acid and its pK_a.

Assuming complete dissociation, calculate the pH of the following solution:

0.003 M HCl

Assuming complete dissociation, calculate the pH of the following solution:

0.005 M NaOH 

Assuming complete dissociation, calculate the pH of the following solution:

0.002 M HBr

Assuming complete dissociation, calculate the pH of the following solution:

0.002 M KOH

Calculate the pH of the following solution: 

2 g of TlOH dissolved in water to give 2 litre of solution.

Calculate the pH of the following solutions:

0.3 g of Ca(OH)₂ dissolved in water to give 500 mL of solution.

Calculate the pH of the following solution:  

0.3 g of NaOH dissolved in water to give 200 mL of solution.