Question
Why is anode negatively charged in an electrochemical cell?
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Answer
At anode, loss of electrons takes place, i.e. oxidation takes place, electron density is more, hence anode is negatively charged.
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Refer to the periodic table given in your book and now answer the following questions:
Select three metals that can show disproportionation reaction.
Select three metals that can show disproportionation reaction.
Arrange in increasing order of:
- Atomic size I, F, Cl, Br.
- Oxidising power I, F, Cl, Br.
Write the product of the following reactions:
→
- $\text{CH}_3-\text{CH}_2-\text{CH}_2-\text{CH}_3\xrightarrow[{\Delta}]{\text{AlCl}_3}$
Out of principal, angular, magnetic and spin quantum number, which quantum number determines the following:
- Shape of orbital.
- Number of orbitals in an orbit.
- Size of orbital.
- Spin orientation of the electron.
A sparingly soluble salt having general formula $\text{A}^{\text{p+}}_{\text{x}}\text{B}^{\text{q-}}_{\text{y}}$ and molar solubility S is in equilibrium with its saturated solution. Derive a relationship between the solubility and solubility product for such salt.
→- Which of the following have identical bond order?
- Which of the following attain the linear structure?
The first $(\Delta_{1}\text{H}_{1})$ and the second $(\Delta_{1}\text{H}_{1})$ionization enthalpies (in $\mathrm{kJ} \mathrm{~mol}^{-1}$ ) and the $(\Delta_{1}\text{H}_{1})$ electron gain enthalpy (in $\mathrm{kJ} \mathrm{~mol}^{-1}$ ) 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)?
Physical properties of ice, water and steam are very different. What is the chemical composition of water in all the three states.
Identify the most stable species in the following set of ions giving reasons:
$_\ominus\ \ \ \ \ \ \ \ _\ominus\ \ \ \ \ \ \ \ \ \ \ \ _\ominus\ \ \ \ \ \ \ \ \ \ \ \ _\ominus\\\text{CH}_3,\ \text{CH}_2\text{Cl},\ \text{CHCl}_2,\ \text{CCl}_3$
→$_\ominus\ \ \ \ \ \ \ \ _\ominus\ \ \ \ \ \ \ \ \ \ \ \ _\ominus\ \ \ \ \ \ \ \ \ \ \ \ _\ominus\\\text{CH}_3,\ \text{CH}_2\text{Cl},\ \text{CHCl}_2,\ \text{CCl}_3$
Derive the necessary equation to calculate pH of weak acid.