List of top Chemistry Questions

Maximum deviation from ideal gas is expected from

Dipole-induced dipole interactions are present in which of the following pairs ?

A magnetic moment of 1.73 BM will be shown by one among the following

At 25°C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm^-1 cm² mol^-1 and at infinite dilution its molar conductance is 238 ohm^-1 cm² mol^-1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is

How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO₃? The concentrated acid is 70% HNO₃.

A reaction having equal energies of activation for forward and reverse reactions has

Based on equation E = -2.178 x 10^-18 J\((\frac{Z^2}{n^2})\) certain conclusions are written. Which of them is not correct ?

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20°C to 35°C ? (R = 8.314 J mol^-1 K^-1)

A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be

A button cell used in watches functions as following
Zn(s) + Ag₂O(s) + H₂O(l) ⇌ 2Ag(s) + Zn²⁺ (aq) + 20H^- (aq)
If half cell potentials are
Zn²⁺(aq) + 2e^- → Zn(s); E° = -0.76 V
Ag₂O(s) + H₂O(l) + 2e^- → 2Ag(s) + 20H^-(aq),
E° = 0.34 V
The cell potential will be

What is the maximum numbers of electrons that can be associated with the following set of quantum numbers ?
n = 3, l=1 and m = -1

The value of Planck's constant is 6.63 × 10^-34 Js. The speed of light is 3 x 10¹⁷ nm s^-1. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of 6 x 10¹⁵ s^-1?

Some reactions of amines are given. Which one is not correct ?

Crystal field stabilisation energy for high spin $d^4$ octahedral complex is

The anion of acetylacetone (acac) forms $Co (acac)_3$ chelate with $Co^{3+}$. The rings of the chelate are :

$6.02 \times 10^{20}$ molecules of urea are present in 100 mL of its solution. The concentration of solution is :-

A reaction having equal energies of activation for forward and reverse reactions has :-

Consider the half-cell reduction reaction :- $Mn^{2+}+2e^{-}\to Mn, E^{0}=-1.18 V$ $Mn^{2+}\to Mn^{3+}+e^{-}, E^{0}=-1.51 V$ The $E^\circ$ for the reaction $3 Mn^{2+}\to Mn^{0}+2Mn^{3+}$ and possibility of the forward reaction are respectively :

$C _{6} H _{5} COCl \xrightarrow{ NH _{3}} X \xrightarrow{ P _{2} O _{5}} Y \xrightarrow [H_2]{ Ni }Z$ The end product in the above sequence of reaction is

Which one of the following gives amine on heating with amide ?

Which of the following gases has the highest value of $rms$ velocity at $298\, K$?

The mass of $112 \, cm^3$ of $NH_3$ gas at $STP$ is

The ionisation energy of an electron in the ground state of helium atom is $24.6\, eV$. The energy required to remove both the electron is

Which of the following pairs are correctly matched? Reactants Products I. $Rx+AgOH (aq)$ RH II. $Rx+AgCN_{(alc)}$ RNC III. $Rx+KCN_{(alc)}$ RNC IV. $Rx+Na_{\text{(ether)}}$ R-R

Arrange the following in increasing order of stability:- $\left(a\right) \left(CH_{3}\right)_{2}C^{^{\oplus}}-CH_{2}-CH_{3} \quad\left(b\right) \left(CH_{3}\right)_{3}C^{^{\oplus}}$ $\left(c\right) \left(CH_{3}\right)_{2}C^{^{\oplus}}H \quad\quad\quad\quad\quad\quad\quad\left(d\right) CH_{3} C^{^{\oplus}}H_{2}$ $\left(e\right)C^{^{\oplus}}H_{3}$