Calculate the percentage of water of crystallization in CuSO4.5H2O
(H = 1, O = 16, S = 32, Cu = 64)
A compound of X and Y has the empirical formula XY2. Its vapour density is equal to its empirical formula weight. Determine its molecular formula.
Given:
Empirical formula = XY2
Vapour density = Empirical formula weight
Molecular formula =?
Molecular weight = n(Empricial formula weight)
= 2 x Vapour density
n(Empirical formula weight) = 2 x Vapour weight
Since, Vapour density = Empirical formula weight
n =2
Molecular formula = 2 (Empirical formula)
= 2(XY2)
Molecular formula = X2Y4
Match the atomic number 2, 4, 8, 15 and 19 with each of the following:
(i) A solid non-metal belonging to the third period.
(ii) A metal of valency 1.
(iii) A gaseous element with valency 2.
(iv) An element belonging to Group 2.
(v) A rare gas.
Arrange the following as per the instruction given in the brackets:
He, Ar, Ne (Increasing order of the number of electron shells)
Arrange the following as per the instruction given in the brackets:
Na, Li, K (Increasing Ionisation Energy)
Arrange the following as per the instruction given in the brackets:
F, Cl, Br (Increasing electronegativity)
Arrange the following as per the instruction given in the brackets:
Na, K, Li (Increasing atomic size)