Chemistry Test ...

Number of atoms present in 52 g of helium is:

(N_A is Avogadro’s constant Gram atomic mass of He is 4 g)

The vapour density of a mixture of gas A (Molecular mass = 40) and gas B (Molecular mass = 80) is 25.Then mole % of gas B in the mixture would be

Atomic mass of Cl is 35.5 g. Calculate the mass of 4.50 moles of chlorine gas, Cl₂.

Atomic mass of bromine is 80 g. The mass of four moles of molecular bromine (Br₂) is:

Modern periodic table is based on atomic no. experiments which proved importance of at no. was -

Atomic no. is the base of -

(i) Lother meyer curve

(ii) Newland octave rule

(iii) Modern periodic table

(iv) Doeberiener triad rule

(v) Long form of periodic table

Atomic wt. or Cl = 35.5 and of I = 127. According to doeberiner triad rule, At. wt. of Br will be -

The elements of groups, 1, 2, 13, 14, 15, 16 and 17 are collectively called -

Justification of putting H in VII A group is -

The discovery of which of the following group of elements gave a death blow to the Newlands Law -