Question
How are 1-nitropropane, 2-nitropropane and 2-methyl-2-nitropropane are distinguished from each other using nitrous acid?
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Consider the reaction:
$3 I _{( aq )}^{-}+ S _2 O _8{ }^{2-}{ }_{( aq )} \longrightarrow I _3^{-}{ }_{( aq )}+2 SO _4{ }^{2-}{ }_{( aq )}$ at particular time $t , \frac{ d \left[ SO _4{ }^{2-}\right]}{ dt }=2.2 \times 10^{-2} M / s$. What are the values of the following at the same time?
(a) $-\frac{ d \left[ I ^{-}\right]}{ dt }$
(b) $\frac{- d \left[ S _2 O _8{ }^{2-}\right]}{ dt }$
(c) $\frac{- d \left[ I _3{ }^{-}\right]}{ d t}$
→$3 I _{( aq )}^{-}+ S _2 O _8{ }^{2-}{ }_{( aq )} \longrightarrow I _3^{-}{ }_{( aq )}+2 SO _4{ }^{2-}{ }_{( aq )}$ at particular time $t , \frac{ d \left[ SO _4{ }^{2-}\right]}{ dt }=2.2 \times 10^{-2} M / s$. What are the values of the following at the same time?
(a) $-\frac{ d \left[ I ^{-}\right]}{ dt }$
(b) $\frac{- d \left[ S _2 O _8{ }^{2-}\right]}{ dt }$
(c) $\frac{- d \left[ I _3{ }^{-}\right]}{ d t}$
State whether $\Delta S$ is positive, negative or zero for the following reactions.
i. $2 H _{2(g)}+ O _{2(g)} \rightarrow 2 H _2 O _{( l )}$
ii. $CaCO _{3(s)} \rightarrow CaO _{( s )}+ CO _{2(g)}$
→i. $2 H _{2(g)}+ O _{2(g)} \rightarrow 2 H _2 O _{( l )}$
ii. $CaCO _{3(s)} \rightarrow CaO _{( s )}+ CO _{2(g)}$
Amorphous solids do not have sharp melting points. Explain.
Complete the given table :
→| The oxidation state of the central atom | Number of lone pairs of electrons | Examples |
| $+7$ | ............................. | $IF _7$ |
| ............................. | 1 | $IF _5$ |
| ............................. | 2 | $I _2 Cl _6$ |
| $+7$ | ............................. | $IBr$ |
Give hybridisation and geometry of the following molecules :
(1) $C1F _3$
(2) $IF _5$
(3) $IF _7$.
→(1) $C1F _3$
(2) $IF _5$
(3) $IF _7$.
Define the following terms:
(i) Isotonic solution (ii) Hypertonic solution (iii) Hypotonic solution.
(i) Isotonic solution (ii) Hypertonic solution (iii) Hypotonic solution.
How is peptide linkage $($dipeptide linkage$)$ formed in proteins? How is tripeptide formed?
→How is standard enthalpy of formation useful to calculate standard enthalpy of reaction ?
Give the important uses of phenol.###Write two uses of phenol.
Boiling point of a solvent is $80.2^{\circ} C$. When $0.419 g$ of the solute of molar mass $252.4 g mol ^{-1}$ is dissolved in $75 g$ of the above solvent, the boiling point of the solution is found to be $80.256^{\circ} C$. Find the molal elevation constant.
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