The relative lowering of vapour pressure of a dilute aqueous solution containing non-volatile solute is 0.0125. The molality of the solution is about
0.70
0.50
0.90
0.80
The activation energy of exothermic reaction A → B is 80 kJ mo1-1. The heat of reaction is 200 kJ mol-1. The activation evergy for the reaction B → A (in kJ mol-1) will be
280
200
120
40
The radius of the first Bohr orbit of hydrogen atom is 0.529 Å. The radius of the third orbit of H+ will be
8.46 Å
0.705 Å
1.59 Å
4.29 Å
Which diagram best represents the appearance of the line spectrum of atomic hydrogen in the visible region?
C.
Line spectrum of atomic hydrogen in the visible region.
Match List-I with List-II and choose the correct matching codes from the choices given.
List - I | List - II |
A. PCl5 | 1. Linear |
B. IF7 | 2. Pyramidal |
C. H3O+ | 3. Trigonal bipyramidal |
D. ClO2 | 4. Tetrahedral |
E. NH |
5. Pentagonal bipyramidal 6. Angular |
A - 3; B - 5; C - 2; D - 1; E - 4
A - 3; B - 5; C - 4; D - 1; E - 2
A - 3; B - 5; C - 6; D - 1; E - 2
A - 3; B - 5; C - 2; D - 6; E - 4
Which one of the following volume (V)- temperature (T) plots represents the behaviour of one mole of an ideal gas at one atmospheric pressure?
In which one of the following pairs the radius of the second species is greater than that of the first?
Na, Mg
O2-, N3-
Li+, Be2+
Ba2+, Sr2+
Match List-I with List-II Choose the correct matching codes from the choices given.
List - I (Hydride) | List - II (Type of hydride) |
A. BeH2 | 1. Complex |
B. AsH3 | 2. Lewis acid |
C. B2H6 | 3. Interstitial |
D. LaH3 | 4. Covalent |
E. LiAlH4 |
5. Intermediate 6. Ionic |
A - 6; B - 2; C - 4; D - 5; E - 1
A - 5; B - 4; C - 2; D - 3; E - 1
A - 6; B - 4; C - 2; D - 3; E - 5
A - 6; B - 4; C - 2; D - 3; E - 1