Question
Explain diamagnetism.
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Write reactions for the following conversions.
Propanone to Propane
Propanone to Propane
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Define activation energy. Calculate activation energy for a reaction of which rate constant becomes four times when temperature changes from $30^\circ C$ to $50^\circ C. ($Given $R = 8.314 JK^{-1} \ mol^{-1}).$
→Write chemical equations indicating the action of following on bromobenzene.
fuming $H_2SO_4$
→fuming $H_2SO_4$
What are common methods of concentration of an ore?
Explain the variable oxidation states of metals of first transition series.
The decomposition of $N _2 O _{5( g )}$ at $320 K$ according to the following equation follows first order reaction:
$N _2 O _{5( g )} \longrightarrow 2 NO _{2( g )}+\frac{1}{2} O _{2( g )}$
The initial concentration of $N _2 O _{5( g )}$ is $1.24 \times 10^{-2} \ mol.L^{-1}$ and after $60$ minutes, $0.20 \times 10^{-2} mol ^{-1} L ^{-1}$.
Calculate the rate constant of the reaction at $320 K$.
→$N _2 O _{5( g )} \longrightarrow 2 NO _{2( g )}+\frac{1}{2} O _{2( g )}$
The initial concentration of $N _2 O _{5( g )}$ is $1.24 \times 10^{-2} \ mol.L^{-1}$ and after $60$ minutes, $0.20 \times 10^{-2} mol ^{-1} L ^{-1}$.
Calculate the rate constant of the reaction at $320 K$.
Why is there a large difference between the melting and boiling points of oxygen and sulphur?
The bond enthalpies of $H _{2( g )}, Br _{2( g )}$ and $HBr _{( g )}$ are $436 kJ mol ^{-1}, 193 kJ mol ^{-1}$ and $366 kJ mol ^{-1}$ respectively. Calculate the enthalpy change for the following reaction,
$H _{2(g)}+ Br _{2(g)} \rightarrow 2 HBr _{( g )} \text {. }$
→$H _{2(g)}+ Br _{2(g)} \rightarrow 2 HBr _{( g )} \text {. }$
Explain the following with the help of balanced chemical equation:
$(a)$ Bleaching action of $SO_2. (b)$ Dehydration of formic acid by concentrated $H_2SO_4. (c)$ Burning of benzene in presence of excess of dioxygen.
→$(a)$ Bleaching action of $SO_2. (b)$ Dehydration of formic acid by concentrated $H_2SO_4. (c)$ Burning of benzene in presence of excess of dioxygen.