Question
Which is more polar: CO2 or N2O? Give reason.
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Compare the relative stability of the following species and indicate their magnetic properties;
$O _2, O _2^{+}, O _2^{-} \quad$ (superoxide), $\quad O _2^{2-} \quad$ (peroxide)
→$O _2, O _2^{+}, O _2^{-} \quad$ (superoxide), $\quad O _2^{2-} \quad$ (peroxide)
Calculate the pH of the solution :
0.3 g of $Ca ( OH )_2$ dissolved in water to give 500 mL of solution.
→0.3 g of $Ca ( OH )_2$ dissolved in water to give 500 mL of solution.
What will be the effect of catalyst on equilibrium? Explain.
Write an expression for Ka, for ionisation of HCN in aqueous solution. Give equation also.
The first $(\Delta_{1}\text{H}_{1})$ and the second $(\Delta_{1}\text{H}_{1})$ionization enthalpies (in kJ mol–1) and the $(\Delta_{1}\text{H}_{1})$ electron gain enthalpy (in kJ mol–1) of a few elements are given below:
Which of the above elements is likely to be:
The metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?
→| Elements | $\Delta\text{H}_{1}$ | $\Delta{\text{H}}_{2}$ | $\Delta_{\text{eg}}\text{H}$ |
| I | 520 | 7300 | -60 |
| II | 419 | 3051 | -48 |
| III | 1681 | 3374 | -328 |
| IV | 1008 | 1846 | -295 |
| V | 2372 | 5251 | +48 |
| VI | 738 | 1451 | -40 |
The metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?
BF3 does not have proton but still acts as an acid and reacts with NH3. Why is it so? What type of bond is formed between the two?
Calculate the radius of Bohr’s fifth orbit for hydrogen atom.
What is the effect of reducing volume on the following system?
$2\text{C}(\text{s})+\text{O}_2\rightleftharpoons2\text{CO}(\text{g})$
→$2\text{C}(\text{s})+\text{O}_2\rightleftharpoons2\text{CO}(\text{g})$
31Ga has slightly higher ionisation enthalpy than 13Al although it occupies lower position in the group?
Suggest a route to prepare ethyl hydrogensulphate $(\text{CH}_3 – \text{CH}_2 – \text{OSO}_2 – \text{OH})$ starting from ethanol $(\text{C}_2\text{H}_5\text{OH})$.
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