Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions

Which of the following exists as covalent crystals in the solid state?

The major binding force of diamond, silicon and quartz is ____________.

In graphite electrons are ____________.

Which one of the following forms a molecular solid when solidified?

Which of the following is a network solid?

Iodine molecules are held in the crystals lattice by ______.

Which of the following is not the characteristic of ionic solids?

Graphite cannot be classified as ______.

Which of the following cannot be regarded as molecular solid?

(i) SiC (Silicon carbide)

(ii) AlN

(iii) Diamond

(iv) I₂

Which of the following is a quantitative description of the solution?

When a solute is present in trace quantities the following expression is used:

Molarity of liquid HCl will be if the density of the solution is 1.17 gm/cc.

1 M, 2.5 litre NaOH solution is mixed with another 0.5 M, 3 litre NaOH solution. Then find out the molarity of the resultant solution:

An X molal solution of a compound in benzene has mole fraction of solute equal to 0.2. The value of X is ____________.

The molarity of the solution containing 7.1 g of Na₂SO₄ in 100 ml of aqueous solution is ____________.

4.0 g of NaOH is dissolved in 100 ml solution. The normality of the solution is ____________.

The molarity of pure water is ____________.

An aqueous solution of glucose is 10% in strength. The volume in which 1 g mole of it is dissolved, will be:

10 g of NaCl is dissolved in 106 g of the solution. Its concentration is ____________.

On adding a solute to a solvent having vapour pressure 0.80 atm, vapour pressure reduces to 0.60 atm. Mole fraction of solute is: