List of top Chemistry Questions

A1 and A2 are two ores of metal M. A1 on calcination gives black precipitate, CO2 and water, and A2 forms a green-coloured complex with acidified K2Cr2O7. 
A1 and A2 respectively are
The vapour pressure of water at 20 °C is 17.5 torr. What will be the no. of moles of water present in one litre of air at 20 °C and 40% relative humidity. (R =0.082 L atm/mol-k)
A solute ‘S’ undergoes a reversible trimerization when dissolved in a certain solvent. The boiling point elevation of its 0.1 molal solution was found to be identical to the boiling point elevation in case of a 0.08 molal solution of a solute which neither undergoes association nor dissociation. To what percent had the solute ‘S’ undergone trimerization?
The compound
when kept in pentane converts to a constitutional isomer. Identify that isomer.
20 g helium is compressed isothermally and reversibly at 27 °C from a pressure of 2 atmosphere to 20 atmosphere. The change in the value of heat energy change during the process is (R = 2 cal kelvin-1 mol-1)
A mixture of gaseous nitrogen and gaseous hydrogen attains equilibrium with gaseous Ammonia according to the reaction 12N2(g)+32H2(g)⇌NH3(ε)It is found that at equilibrium when temperature is 673 K, atmospheric pressure is 100, moles of gaseous nitrogen and gaseous hydrogen are in ratio 1:3 and mole percent of gaseous ammonia is 24. The equilibrium constant Kp for the reaction at the above condition is-
The wavelength of a radiation having frequency 1000Hz is:
Emission transitions in the Paschen series end at orbit n = 3 and start from orbit n and can be represented as $v=3.29\times10^{15} Hz \left(\frac{1}{3^{2}}-\frac{1}{n^{2}}\right)$ Calculate the value of n if the transition is observed as 1285 nm.
The acidic hydrolysis of ether (X) shown below is fastest when:
On addition of the 1ml. solution of \(10\%\) NaCl to 10ml gold sol in the presence of 0.00399gm of starch calculate the gold no.

PhCOOH and PhCH3 can be separated by

In which of the following does the central atom exhibit an oxidation state of +2 ? 

In the hydration of an alkene carbocation is formed from :

The compound formed when 2- butenes is treated with hot alkaline \(KMnO_{4}\) is:

If conductivity of water used to make saturated of AgCl is found to be \(3.1\times10^{-5}Ω^{-1}cm^{-1}\) and conductance of the solution of AgCl = \(4.5\times10^{-5}Ω^{-1}cm^{-1}\) 

If \(λ^θ\) AgNO3  = \(200 Ω^{-1}cm^{2}mole^{-1}\)

\(λ^θ\)NaNO3 = \(310 Ω^{-1}cm^{2}mole^{-1}\) 

calculate Ksp of AgCl

(a) At infinite dilution, the ionic conductance of Ba2+ and Cl is 121 and 76 ohm-1 cm respectively. What will be the equivalent conductance of BaCl2 (in ohm-1 cm2) at infinite dilution?  
(b) What effect does concentration have on the molar conductivity of a strong electrolyte?

A sample of H2SO4 is labeled as 86% by weight by weight. What is the molarity of acid?

Whet volume of acid to be used to make 1 litre of 0.2M H2SO4?

The magnetic moment of a transition metal compound has been calculated to be 3.87 bms.The metal ion is 

  1. Define molar conductivity of a substance and describe how for weak and strong electrolytes, molar conductivity changes with concentration of solute. How is such change explained?
  2. A voltaic cell is set up at 25°C with the following half cells:
    Ag+ (0.001 M) | Ag and Cu2+ (0.10 M) | Cu

What would be the voltage of this cell? (Eo cell = 0.46 V)

The number of water molecules present in a drop of water (volume 0.0018 mL) density = 18 $mL^{-1}$ at room temperature is

which of the following cation would have greatest stability?

The structure of $ {XeF_6} $ is

If a reaction follows the Arrhenius equation, the plot lnk vs 1/(RT) gives a straight line with a gradient (–y) unit. The energy required to activate the reactant is

Which of the following will not give a white ppt. when $AgNO_{3}$ is added to its solution?
Electrophilic substitution reactions in haloarenes occur slowly and require more drastic conditions as compared to those in benzene. Halogens are ortho and para-directors.