Amylopectin is composed of

Among the following species
\(N _{2}, N _{2}^{+}, N _{2}^{-}, N _{2}{ }^{2-}, O _{2}, O _{2}{ }^{+}, O _{2}^{-}, O _{2}{ }^{2-}\) the number of species showing diamagnetism is.

The mass of silver (Molar mass of \(\mathrm{Ag}: 108\  \mathrm{gmol}^{-1}\) ) displaced by a quantity of electricity which displaces \(5600 \mathrm{~mL}\) of \(\mathrm{O}_2\) at \(S.T.P.\) will be_____________\( g.\)

Sulphurous acid \(\left( H _{2} SO _{3}\right)\) has \(Ka _{1}=1.7 \times 10^{-2}\) and \(Ka _{2}=6.4 \times 10^{-8} .\) The \(pH\) of \(0.588 \,M\, H _{2} SO _{3}\) is ..... . (Round off to the Nearest Integer)

In which pairs, the first ion is more stable than the second?

Consider the following reactions.
\(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7 \xrightarrow[-\mathrm{H}_2 \mathrm{O}]{\mathrm{KOH}}[\mathrm{A}] \xrightarrow[-\mathrm{H}_2 \mathrm{O}]{\mathrm{H}_2 \mathrm{SO}_4}[\mathrm{~B}]+\mathrm{K}_2 \mathrm{SO}_4\)
The products \([A]\) and \([B]\), respectively are :

Consider the following plots of rate constant versus \(\frac{1}{\mathrm{T}}\) for four different reactions. Which of the following orders is correct for the activation energies of these reactions?

In an \(A.C.\) circuit, the instantaneous \(e.m.f\) and current are given by. \(e=100\) \(sin\) \(20t\) \(i=20sin\) \(\left( {30t - \frac{\pi }{4}} \right)\) In one cycle of \(A.C.\), the average power consumed by the circuit and the wattless current are, respectively

Consider the data on x taking the values \(0,2,4,8, \ldots, 2^{n}\) with frequencies \({ }^{n} C_{0},{ }^{n} C_{1},{ }^{n} C_{2}, \ldots\) \({ }^{ n } C _{ n }\) respectively. If the mean of this data is \(\frac{728}{2^{ n }},\) then \(n\) is equal to

A capacitor P with capacitance \( 10\times10^{-6} F \) is fully charged with a potential difference of 6.0 V and disconnected from the battery. The charged capacitor P is connected across another capacitor Q with capacitance \( 20\times10^{-6} F \). The charge on capacitor Q when equilibrium is established will be \( \alpha\times10^{-5} C \).(assume capacitor \(Q\) does not have any charge initially),The value of \( \alpha \) is __________ .

\(\operatorname{Lim}_{n \rightarrow \infty}\left\{\left(2^{\frac{1}{2}}-2^{\frac{1}{3}}\right)\left(2^{\frac{1}{2}}-2^{\frac{1}{5}}\right) \ldots \ldots\left(2^{\frac{1}{2}}-2^{\frac{1}{2 n+1}}\right)\right\}\) is equal to

Evaluate the following statements related to group \(14\) elements for their correctness. \((A)\)Covalent radius decreases down the group from \(\mathrm{C}\) to \(\mathrm{Pb}\) in a regular manner. \((B)\) Electronegativity decreases from \(\mathrm{C}\) to \(\mathrm{Pb}\) down the group gradually. \((C)\) Maximum covalence of \(\mathrm{C}\) is \(4\) whereas other elements can expand their covalence due to presence of \(d\) orbitals. \((D)\) Heavier elements do not form \(\mathrm{p} \pi-p \pi\) bonds. \((E)\) Carbon can exhibit negative oxidation states. Choose the correct answer from the options given below:

\(200\, \mathrm{~mL}\) of \(0.2\, \mathrm{M} \mathrm{HCl}\) is mixed with \(300\, \mathrm{~mL}\) of \(0.1\, \mathrm{M} \mathrm{NaOH}\). The molar heat of neutralization of this reaction is \(-57.1 \,\mathrm{~kJ}\). The increase in temperature in \({ }^{\circ} \mathrm{C}\) of the system on mixing is \(\mathrm{x} \times 10^{-2}\). The value of \(\mathrm{x}\) is ....... . (Nearest integer) [Given : Specific heat of water \(=4.18\, \mathrm{~J} \,\mathrm{~g}^{-1}\, \mathrm{~K}^{-1}\) Density of water \(=1.00\, \mathrm{~g}\, \mathrm{~cm}^{-3}\) ] (Assume no volume change on mixing)