Chloride of an element A gave a neutral solution in water. In the periodic table the element A belongs to
1. First group
2. Third group
3. Fifth group
4. Transitional metal
Difficulty Level:
The correct relationship between the pH of isomolar solutions of sodium oxide(pH1), sodium sulphide (pH2), sodium selenide (pH3) and sodium telluride (pH4) is -
1.
2.
3.
4.
Difficulty Level:
NO2 can be produced by heating -
1. NaNO3
2. AgNO3
3. NH4NO3
4. NH4NO2
Difficulty Level:
The formation of is difficult as compared to because
1. Lone pair of phosphorous is optically inert.
2. Lone pair of phosphorous resides in almost pure p - orbital.
3. Lone pair of phosphorous resides at sp3 orbital.
4. Lone pair of phosphorous resides in almost pure s - orbital.
Difficulty Level:
Concentrated nitric acid reacts with iodine to give:
1. HOI
2. HI
3. HIO3
4. HIO4
Difficulty Level:
Partial Hydrolysis of one mole of peroxodi-sulphuric acid produces
1. Two moles of sulphuric acid
2. Two moles of peroxomono-sulphuric acid
3. One mole of sulphuric acid, one mole of peroxomono-sulphuric acid
4. One mole of sulphuric acid, one mole of peroxomono-sulphuric acid and one mole of hydrogen peroxide
Difficulty Level:
Which of the following is the correct statement?
1. F2 has higher dissociation energy than Cl2
2. F has higher electron affinity than Cl
3. HF is stronger acid than HCl
4. Boiling point increases down the group in halogens
Difficulty Level:
Incorrectly matched characteristic is:
1. S8: covalent lattice
2. P4: tetrahedron
3. S52-: zigzag
4. SiO2: Covalent lattice
Difficulty Level:
N2 cannot be produced by heating -
1. (NH4)2Cr2O7
2. NH4Cl+NaNO2
3. NH4Cl+CaO
4. Ba(N3)2
Difficulty Level:
An oxyacid among the following that contains both P-H and P-P bond simultaneously is -
1. H4P2O5
2. H4P2O7
3. H4P2O6
4. None of the above
Difficulty Level: