A buffer solution contains \(0.1\) mole of sodium acetate dissolved in \(1000 \mathrm{~cm}^{3}\) of \(0.1 \mathrm{M}\) acetic acid. To the above buffer solution, \(0.1\) mole of sodium acetate is further added and dissolved. The \(\mathrm{pH}\) of the resulting buffer is

Which of the following is not true?

\(\alpha-\mathrm{D}-(+)\)-glucose and \(\beta\)-D-(+)-glucose are

Match List-I with List-II
\begin{array}{|l|l|l|l|}\hline & \text{List-I (Types of redox reactions)} & & \text{List-II (Examples)} \\\hline \text{a}. & \text{Combination reaction} & \text{(i)} & \mathrm{Cl}_{2(\mathrm{~g})}+2 \mathrm{Br}_{(\mathrm{aq})}^{-} \rightarrow 2 \mathrm{Cl}_{(\mathrm{aq})}^{-}+\mathrm{Br}_{2(\mathrm{l})} \\\hline \text{b.} & \text{Decomposition reaction} & \text{(ii)} & 2 \mathrm{H}_2 \mathrm{O}_{2(\mathrm{aq})} \rightarrow 2 \mathrm{H}_2 \mathrm{O}_{(1)}+\mathrm{O}_{2(\mathrm{~g})} \\\hline \text{c.} & \text{Displacement reaction} & \text{(iii)} & \mathrm{CH}_{4(\mathrm{~g})}+2 \mathrm{O}_{2(\mathrm{~g})} \xrightarrow{\Delta} \mathrm{CO}_{2(\mathrm{~g})}+2 \mathrm{H}_2 \mathrm{O}_{(1)} \\\hline \text{d.} & \text{Disproportionation reaction} & \text{(iv)} & \mathrm{H}_2 \mathrm{O}_{(1)} \xrightarrow{\Delta} 2 \mathrm{H}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \\\hline\end{array}

Choose the correct answer from the options given below.

Statement-I: Nitrogen in pyridine cannot be estimated by Kjeldahl's method.
Statement-II: Nitrogen in pyridine changes to ammonium sulphate when heated with conc. \(\text{H}_2\text{SO}_4\) in Kjeldahl's method.
Read the above given statements and choose the correct answer from the given options.

Angle strain in cyclopropane is

The number of atoms in \( 2.4 \mathrm{~g} \) of body centred cubic crystal with edge length \( 200 \mathrm{pm} \) is (density
\( =10 \mathrm{~g} \mathrm{~cm}^{-3}, \mathrm{NA}=6 \times 10^{23} \) atoms \( / \mathrm{mol} \) )

Connell's field experiment on the rocky sea coast of Scotland, where larger Barnacle Balanus dominates the intertidal area and removes the smaller Barnacle Chthamalus. This happened due to

Spectrum of sunlight is an example for

Eight drops of mercury of equal radii combine to form a big drop. The capacitance of a bigger drop as compared to each smaller drop is

The type of polysaccharide present in a cotton fibre

\(100 \mathrm{~g}\) of ice at \(0^{\circ} \mathrm{C}\) is mixed with \(100 \mathrm{~g}\) of water at \(100^{\circ} \mathrm{C}\). The final temperature of the mixture is
[Take, \(L_f=3.36 \times 10^5 \mathrm{~J} \mathrm{~kg}^{-1}\) and \(\left.S_w=4.2 \times 10^3 \mathrm{~J} \mathrm{~kg}^{-1} \mathrm{~K}^{-1}\right]\)

Frequency of revolution of an electron revolving in nth orbit of H-atom is proportional to