Q. No.Which pair of atom form strongest ionic bond?
(1) Al and As
(2) Al and N
(3) Al and Se
(4) AL and O
The correct order of increasing s-character (in percentage) in the hybrid orbitals of the following molecules/ions is:
| (i) | \(\mathrm{CO}^{2-}_3\) |
| (ii) | \(\mathrm{XeF}_4\) |
| (iii) | \(\mathrm{I}^-_3\) |
| (iv) | \(\mathrm{NCl}_3\) |
| (v) | \(\mathrm{BeCl}_2\) |
| 1. | (ii)<(iii)<(iv)<(i)<(v) | 2. | (ii)<(iv)<(iii)<(v)<(i) |
| 3. | (iii)<(ii)<(i)<(v)<(iv) | 4. | (ii)<(iv)<(iii)<(i)<(v) |
How many possible resonance forms exist for the nitrate ion, \(\text{NO}_3^-\)?
| 1. | One | 2. | Two |
| 3. | Three | 4. | Four |
Which of the following fact is directly explained by the statement 'oxygen is a smaller atom than sulpher'?
(1) boils at a much higher tempreture than
(2) undergoes intermolecure hydrogen bonding
(3) is liquid and is gas at room tempreture
(4) SH bond is longer than OH bond
Which of the following statement is correct in the context of the allene molecules, ?
1. The central carbon is Sp hybridized
2. The terminal carbon atoms are hybridized
3. The planes containing the groups are mutually perpendicular to permit the formations of two separate - bonds
4. All are correct
Select the incorrect statement about :
(i) In, d-orbitals are contracted by electronegative fluorine atoms, but d-orbitals contaraction is not possible by H-atom in
(ii) The N-N bond energy in is lesser than N-N bond energy in
(iii) The N-N bond length in is more than that in
(iv) The N-N bond length in is less than that in
Choose the correct code:
(a) (i),(ii) and (iii) (b) (i) and (iii)
(c) (ii) and (iv) (d) (ii) and (iii)
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