Which of the following forces stabilize the secondary structure of proteins?
A. Hydrogen bonds
B. Covalent bonds
C. Disulphide linkages
D. Vander Waals forces

Arrange the following complexes in increasing order of the number of unpaired electrons present in the central metal ion:
I. \( [Fe(CN)_6]^{3-} \)
II. \( [Co(C_2O_4)_3]^{3-} \)
III. \( [Mn(CN)_6]^{3-} \)

Which one of the following ions is diamagnetic in nature?

The number of mixed oxides from the following is: \[ {Al}_2{O}_3, {Pb}_3{O}_4, {Mn}_2{O}_7, {Fe}_3{O}_4, {V}_2{O}_5, {Sb}_2{O}_3 \]

The dispersed phase and dispersion medium in smoke, respectively, are:

A conductivity cell is filled with a solution of KCl of concentration 0.2 mol dm\(^{-3}\) and its conductivity is 0.28 S m\(^{-1}\). The resistance of this solution is 82.2 Ω. The same cell filled with a solution of 0.0025 mol dm\(^{-3}\) K₂SO₄ showed a resistance of 325 Ω. The molar conductivity of K₂SO₄ solution (in S m² mol\(^{-1}\)) is:

Ethylene glycol (C\(_2\)H\(_6\)O\(_2\)) is used as an antifreeze in cars. In a certain place, it is desired that water freezes at 258K. How much weight of ethylene glycol is needed to prevent separation of ice from 500 g of water? \[ (K_f { of water} = 1.86 { K kg mol}^{-1}) \]

A crystalline solid of the type AB\(_2\) has a ccp arrangement for its element B. So, A occupies:

Which of the following alkenes is most stable?

0.2 g of an organic compound containing C, H, and O on complete combustion gave 0.46 g of \(CO_2\) and 0.25 g of \(H_2O\). What is the percentage of oxygen in that compound?

Which of the following, when present in higher concentrations in air, retards the rate of photosynthesis?

In the reaction of sodium borohydride with \(X\) gives diborane as one product. Identify \(X\) and type of reaction.

Identify the correct order of polarizing power of given cations:

Identify the correct statements from the following:
(i) In gas phase, the dihedral angle in H₂O₂ is 90.2°
(ii) 50% H₂SO₄ is used in the preparation of H₂O₂ by electrolysis method
(iii) H₂O₂ is used in the synthesis of cephalosporin

A few isotherms of CO2 are shown below. Identify the correct statements (Tc is the critical temperature of CO2; T1<T2<T3<Tc):
I. At point X, CO₂ exists as liquid
II. At point Y, CO₂ exists as gas
III. At point Z, CO₂ exists as liquid

At 300 K, the value of \(u_{{rms}}^2\) of an ideal gas is \(x \, {m}^2/{s}^2\). What is the \(u_{{av}}^2\) (in \({m}^2/{s}^2\)) of this gas at the same temperature?