List of top Chemistry Questions

The change in potential of the half-cell Cu\textsuperscript{2+|Cu, when aqueous Cu\textsuperscript{2+} solution is diluted 100 times at 298 K? \(\left( \frac{2.303 RT}{F} = 0.06 \right)\)}

An aqueous solution containing 3 g of a solute of molar mass 111.6 g mol\textsuperscript{--1 in a certain mass of water freezes at --0.125 $^\circ$C. The mass of water in grams present in the solution is ($K_f = 1.86$ K kg mol\textsuperscript{--1})}

A sample of sea water contains $5 \times 10^{-3}$ g of dissolved oxygen in 1 kilogram of the sample. The concentration of O\textsubscript{2} in that sea water sample in ppm is}

The values of limiting ionic conductance of H\textsuperscript{+ and HCOO\textsuperscript{--} ions are respectively 347 and 53 S cm\textsuperscript{2} mol\textsuperscript{--1} at 298 K. If the molar conductance of 0.025M methanoic acid at 298 K is 40 S cm\textsuperscript{2} mol\textsuperscript{--1}, the dissociation constant of methanoic acid at 298 K is}

The entropy of vaporization of a liquid is 58 JK\textsuperscript{--1mol\textsuperscript{--1}. If 100 g of its vapour condenses at its boiling point of 123$^\circ$C, the value of entropy change for the process is (Molar mass of the liquid = 58 g mol\textsuperscript{--1})}

In a closed cylinder of capacity 24.6 L the following reaction occurs at 27$^\circ$C
$A_2(s) \rightleftharpoons B_2(s) + 2C(g)$. At equilibrium 1 g of $B_2(s)$ (molar mass = 50 g mol\textsuperscript{--1}) is present. The equilibrium constant $K_p$ for the equilibrium in atm\textsuperscript{2 unit is ($R = 0.082$ L atm K\textsuperscript{--1} mol\textsuperscript{--1})}

The pH of a saturated solution of a metal hydroxide of formula X(OH)\textsubscript{2 is 12.0 at 298 K. What is the solubility product of the metal hydroxide at 298 K (in mol\textsuperscript{3} L\textsuperscript{--3})?}

Which one of the following statements is not true in respect of properties of interhalogen compounds?

Which one of the following is an incorrect statement?

The calculated magnetic moment of a divalent ion of an atom with atomic number 24 in aqueous solution is

The correct descending order of oxidizing power of the following is

The number of electrons that are involved in the reduction of permanganate to manganese(II) salt, manganate and manganese dioxide respectively are

The salt of an alkali metal gives violet colour in the flame test. Its aqueous solution gives a white precipitate with barium chloride in hydrochloric acid medium. The salt is

In which one of the following the central atom is sp\textsuperscript{3 hybridized?}

The reaction of H\textsubscript{2 is given below
H\textsubscript{2} + CO + R--CH=CH\textsubscript{2} \(\rightarrow\) R--CH\textsubscript{2}--CH\textsubscript{2}--CHO
is specifically called as}

Which of the following are isoelectronic species?
(i) NH\textsubscript{3 (ii) CH\textsubscript{3}\textsuperscript{+} (iii) NH\textsubscript{2}\textsuperscript{--} (iv) NH\textsubscript{4}\textsuperscript{+}
Choose the correct answer from the codes given below}

Arrange the following species in the correct order of their stability:
$C_2$, $Li_2$, $O_2^+$, $He_2^+$

Molecular formulae and shapes of some molecules are given below. Choose the incorrect match

At 273 K, the density of a certain gaseous oxide at 2 atmosphere is same as that of dioxygen at 5 atmosphere. The molecular mass of the oxide (in g mol\textsuperscript{--1}) is

If two moles of an ideal gas at 500 K occupies a volume of 41 litres, the pressure of the gas is (R = 0.082 L atm K\textsuperscript{--1} mol\textsuperscript{--1})

The lattice energy of NaCl is $788 \text{ kJ mol}^{-1}$. This means that 788 kJ of energy is required}

Potassium dichromate belongs to which crystal system?

The carbohydrate used as storage molecules in animals is

Novlac, the linear polymer used in paints is

A 250 W electric bulb of 80% efficiency emits a light of 6626 \AA wavelength. The number of photons emitted per second by the lamp is ($h = 6.626 \times 10^{-34}$ Js)