List of top Chemistry Questions

Which among the following is the strongest acid?

Calculate the molar mass of an element having density $19.2 \text{ g cm}^{-3}$ if it forms fcc structure $\left[ \text{a}^3 \times \text{N}_{\text{A}} = 40 \text{ cm}^3 \text{ mol}^{-1} \right]$}

Which of the following equation exhibits integrated rate law equation for first order reaction?

Which from following statements is NOT true about physisorption?

Which from following groups exhibits +I effect?

Which from following is a semisynthetic polymer?

Calculate the Henry's law constant at $25^\circ\text{C}$ if solubility of gas in liquid is $2.1 \times 10^{-2} \text{ moldm}^{-3}$ at $0.18 \text{ bar}$.

Identify the product 'C' formed in the following series of reactions. Reaction: Bromoethane $\xrightarrow{\text{Mg / dry ether}}$ A $\xrightarrow{\text{H}_2\text{O / dry ether}}$ B $\xrightarrow{\text{Br}_2 / \text{UV}}$ C

What is the frequency of red light having wave length $750 \text{ nm}$ ?

What is the name of isopropyl alcohol according to carbinol system?

What is the number of chiral carbon atoms and number of formyl groups respectively present in ribose?

The entropy of vaporisation of benzene is $85 \text{ J K}^{-1} \text{ mol}^{-1}$. When 117 g of benzene vaporises at its boiling point, what is entropy change of surrounding if process is at equilibrium?

Which from the following equations represents the relation between solubility ( $\text{mol L}^{-1}$ ) and solubility product for the salt $\text{B}_2\text{A}$ ?

Which element from following does NOT exhibit magnetic moment in +1 state?

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

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}

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

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})

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

Potassium dichromate belongs to which crystal system?

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}

The carbohydrate used as storage molecules in animals 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)