List of top Chemistry Questions

The angular momentum of electron in H atom in \(n_x\) state is \(1.051\times10^{-34}\,\mathrm{J\,s}\). The de Broglie wavelength of electron in this \(n_x\) state is \[ (h=6.6\times10^{-34}\,\mathrm{J\,s};\ \pi=3.14) \]

Beryllium is diagonally related to the element \(X\) and lithium is diagonally related to the element \(Y\). The nature of oxides of \(X\) and \(Y\) are respectively

Identify \(Base_2\) for the following equation according to Brønsted-Lowry theory:
\( HCl(aq) + H_2O(l) \rightleftharpoons H_3O^+(aq) + Cl^-(aq) \)

For a zero-order reaction, where \(k = 1.0\ mol\ L^{-1}\ min^{-1}\). If the initial concentration of A is \(2\ M\), then the time taken for completion of \(75\%\) of the reaction will be

The nurse makes that the diet consumed by PEM child is rich in

The molar conductivity ($\Lambda_m^0$) at infinite dilution for HCl, NaCl and CH$_3$COONa at 25\(^{\circ}\)C are 426, 126 and 91 S cm\(^2\) respectively. The \(\Lambda_m^0\) for acetic acid at the same temperature will be

For which of the following is the adsorption theory applicable?

An aqueous solution of CuSO$_4$ solution is electrolysed for 193 s with a current of 2.5 amp. Given that the atomic mass of Cu is 63.5 and F = 96500 coulombs, the amount of copper deposited at the anode is

A colloidal solution is subjected to an electric field. The colloidal particles move toward the anode. In the coagulation of this solution using NaCl, BaCl$_2$ and AlCl$_3$ separately, which one is the correct order of coagulation power?

A 0.02(M) NaOH solution and a 0.01(M) HCl solution are mixed in the volume ratio of 2:3. The pH of the mixed solution will be

During alloy formation if one of the metal is Hg (Mercury), then the alloy is called as:

What type of bond is formed by the sharing of electrons between two atoms to achieve a completely filled outermost shell?

At what temperature is gypsum heated to form Plaster of Paris?

Protecting steel and iron from rusting by coating them with a thin layer of zinc is called:

Why do ionic compounds have high melting points?

Metal items are tarnished when kept open in air for some time. Silver utensils become blackish, copper utensils become greenish due to corrosion. The gases responsible for this corrosion respectively are:

Which of the following ore is concentrated by Froth floatation process?

Four metals A, B, C and D were taken in five different solutions of silver nitrate, zinc sulphate, copper sulphate and iron sulphate and the observations have been listed below:

Reactivity order of metals A, B, C and D is:

Aqua regia is a mixture of concentrated HCl and concentrated \(HNO_3\) in the ratio of ____________ respectively.

Some metal oxides react with acid as well as base to produce salt and water, these are known as amphoteric oxides. The examples of amphoteric oxides are:

Phosphorus is stored in :

Gold is used in making ornaments because it is :

When chlorine gas is passed in lime water, it forms chemical compound 'M' (main constituent of bleaching powder) and 'N' (used for bleaching in textile industry). Identify the correct option.

How many water molecules does hydrated calcium sulphate contain?