Question
Explain the effect of temperature on spontaneity.

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Balance the following ionic equations. $\text{MnO}^{-}_4+\text{SO}^{2-}_3+\text{H}^+\xrightarrow{ \ \ \ \ \ \ \ \ \ }\text{Mn}^{2+}+\text{SO}^{2-}_4+\text{H}_2\text{O}$
S. No
Column I
Column II
1.
$[Mn(CO)_5]^-$
+6
2.
$[Mn_2(CO)_{10}]$
+2
3.
$K_4[Mn(CN)_6]$
0
4.
$K_2MnO_4$
-1
Calculate the mass percent of calcium, phosphorus and oxygen in calcium phosphate $\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2$.
The ionization constant of benzoic acid is $6.46 \times 10^{–5}$ and $K_{sp}$ for silver benzoate is $2.5 \times 10^{–13}$. How many times is silver benzoate more soluble in a buffer of $pH\ 3.19$ compared to its solubility in pure water?
Calcium carbonate reacts with aqueous HCl to give $\mathrm{CaCl}_2$ and $\mathrm{CO}_2$ according to the reaction, $\mathrm{CaCO}_{3(\mathrm{~s})}+2 \mathrm{HCl}_{(\mathrm{aq})} \rightarrow$ $\mathrm{CaCl}_{2(\mathrm{aq})}+\mathrm{CO}_{2(g)}+\mathrm{H}_2 \mathrm{O}_{(l)}$
What mass of $\mathrm{CaCO}_3$ is required to react completely with 25 mL of 0.75 M HCl ?
  1. Define enthalpy of neutralization. The enthalpy of neutralisation of strong acid and strong base is constant, why?
  2. What is the basis of Hess's Law?
  3. For a gaseous reaction $2A_2(g) + 5B_2(g) → 2A_2B_5(g) at 27^\circC$, the heat change at constant pressure is found to be -50.16kJ. Calculate the value of internal energy change $(\Delta\text{U}).$
Given: $R = 8.314JK^{-1}mol^{-1}$​​​​​​​
Match the terms mentioned in Column I with the terms in Column II.
 
Column I
 
Column II
(i)
Carbocation
(a)
Cyclohexane and 1- hexene.
(ii)
Nucleophile
(b)
Conjugation of electrons of C–H σ bond with empty p-orbital present at adjacent positively charged carbon.
(iii)
Hyperconjugation
(c)
$\text{sp}^2$ hybridised carbon with empty p-orbital.
(iv)
Isomers
(d)
Ethyne
(v)
sp hybridisation
(e)
Species that can receive a pair of electrons.
(vi)
Electrophile
(f)
Species that can supply a pair of electrons.
Derive the relationship between equilibriumconstant (K), reaction constant (Q) and Gibbs energy (G) and explain spontaneity of reaction with help of it.
Extensive properties depend on the quantity of matter but intensive properties do not. Explain whether the following properties are extensive or intensive. Mass, internal energy, pressure, heat capacity, molar heat capacity, density, mole fraction, specific heat, temperature and molarity.
Give a brief description of the principles of the following techniques taking an example in each case.
Crystallisation