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Write formula for the following compound:

Chromium(III) oxide.

Write the expression for the equilibrium constant, Kc for each of the following reactions:
$\text{I}_2\text{(S)}+5\text{F}_2\rightleftharpoons2\text{IF}_5$
Indicate whether the following statement is true or false. Justify your answer in not more than three lines. The dipole moment of CH3F is greater than that of CH3CL.
Explain, giving reasons, which of the following sets of quantum numbers are not possible.
$\text{n}=1, \text{l}=1,\text{m}_{\text{l}}=0,\text{m}_{\text{s}}=+\frac{1}{2}$
For two acids HA and HB the value of $K _{ a }$ is $10^{-4}$ and $10^{-6}$ respectively then which conjugate base of these acids will be strong?
What would be the colour of light emitted from an excited hydrogen atom when an electron jumps from n = 3 to n = 2?
Which of the following reactions will get affected by increasing the pressure? Also, mention whether change will cause the reaction to go into forward or backward direction.
$\text{2H}_2\text{ (g) + CO}\text{ (g)}\rightleftharpoons\text{CH}_3\text{OH (g)}$
Which of the followings are Lewis acids? H2O, BF3, H+, and $\text{NH}_4^+$
Predict which of the following reaction will have appreciable concentration of reactants and products :
(a) $Cl _2(g) \rightleftharpoons 2 Cl ( g ) K _{ c }=5 \times 10^{-39}$
(b) $Cl _2(g)+2 NO ( g ) \rightleftharpoons 2 NOCl ( g ) K _{ c }=3.7 \times 10^8$
(c) $Cl _2(g)+2 NO _2(g) \rightleftharpoons 2 NO _2 Cl ( g ) K _c=1.8$
At 473K, equilibrium constant Kc for decomposition of phosphorus pentachloride, PCl5 is 8.3 ×10-3. If decomposition is depicted as,
$\text{PCl}_5\text{ (g)}\rightleftharpoons\text{PCl}_3\text{ (g) + Cl}_2\text{ (g)}\ \Delta_\text{r}\text{H}^\ominus=124.0\text{ kJ mol}^{-1}$
what is the value of Kc for the reverse reaction at the same temperature?