Which one of the following compounds has sp2 hybridization?
Відповідь
(B)
SO2
2
For a d-electron the orbital angular momentum is
Відповідь
(A)
$$\sqrt 6 \left( {h/2\pi } \right)$$
3
The critical temperature of water is higher than that of O2 because the H2O molecule has
Відповідь
(D)
dipole moment
4
Which contains both polar and non-polar bonds?
Відповідь
(C)
H2O2
5
A compound of vanadium has a magnetic moment of 1.73 BM. Work out the electronic configuration of the vanadium ion in the compound.
Відповідь
(D)
1s2 2s2 2p6 3s2 3p6 3d1
6
Give reasons of the following:
The crystalline salts of alkaline earth metals contain more water of crystallisation than the corresponding alkali metal salts.
Відповідь
A
C
D
7
To a 25ml H2O2 solution, excess of acidified solution of potassium iodide was added. The iodine liberated required 20 ml of 0.3 N sodium thiosulphate solution. Calculate the volume strength of H2O2 solution.
Відповідь
(B)
1.344
8
Give reactions for the oxidation of hydrogen peroxide with potassium permanganate in acidic medium.
Відповідь
A
B
C
9
Element A burns in nitrogen to give an ionic compound B. Compound B reacts with water to give C and D. A solution of C becomes 'milky' on bubbling carbon dioxide. Identify A, B, C and D.
Відповідь
(C)
A = Ba, B = Ba3N2, C = Ba(OH)2, D = NH3
10
Arrange the following sulphates of Alkaline earth metals in order of decreasing thermal stability : BeSO4, MgSO4, CaSO4, SrSO4
Відповідь
(D)
SrSO4 > CaSO4 > MgSO4 > BeSO4
11
How many grams of silver could be plated out on a serving tray by electrolysis of a solution containing silver in +1 oxidation state for a period of 8.0 hours at a current of 8.46 amperes? What is the area of the tray if the thickness of the silver plating is 0.00254 cm? Density of silver is 10.5 g/cm3
