List of top Chemistry Questions

The volume of water to be added to N/2 HCl to prepare $500 cm^3$ of N/10 solution is

The process by which protein synthesis takes place is based on genetic information is called

For a reaction if $K_p > K_c$ the forward reaction is favoured by (T > 15 K)

On the basis of the information available from the reaction: \(\frac 43 Al+O_2→\frac 23 Al_2O_2\), ∆G = -827 KJ mol^-1 of O₂, the minimum e.m.f. required to carry out electrolysis of Al₂O₃ is (F = 96500 C mol^–1)

In Haber process $30\,L$ of dihydrogen and $30\,L$ of dinitrogen were taken for reaction which yielded only $50\%$ of the expected product. What will be the composition of gaseous mixture under the aforesaid condition in the end?

Rate of physical adsorption increases with

Two gas cylinders having same capacity have been filled with 44 g of $4H_2$ and 44 g of $CO_2$ of respectively. If the pressure in $CO_2$ cylinder is 1 atmosphere at a particular temperature pressurein the hydrogen cylinder at the same temperatureis

A signature written with carbon pencil weighs 1 mg. What is the number of carbon atoms present in the signature ?

The molarity of pure water is:

The intensive property among the following is

Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite -

Heat liberated' when 100 mL of 1 N NaOH isneutralised by 300 mL of 1 N HCl

In a lime kiln, to get higher yield of $CO_2$, the measure that can be taken is

During depression of freezing point in a solution the following are in equilibrium

Mixture X= 0.02 mole of $[Co(NH_3)_5SO_4]Br $ and 0.02 mole of $[Co(NH_3)_5Br]SO_4 $ was prepared in 2 L of solution. 1 L of mixture X + excess $AgNO_3 \rightarrow Y $ 1 L of mixture X + excess $BaCI_2 \rightarrow Z $ Number of moles of Y and Z are

A pressure cooker reduces cooking time for food because :

The shape of a molecule of NH$_3$, in which the central atom contains a lone pair of electrons, is

The rate constant of a reaction at temperature 200 K is 10 times less than the rate constant at 400 K. What is the activation energy $ E_a$ of the reaction? (R = Gas constant)

The pyknometric density of sodium chloride crystal is 2.165×10³ kg m^–3 while its X-ray density is 2.178×10³ kg m^–3. The fraction of unoccupied sites in sodium chloride crystal is:

Which one of the following octahedral complexes will not show geometric isomerism? (A and B are monodentate ligands)

The number of unpaired electrons in the complex ion \([CoF_6]^{3–}\) is: (Atomic No.of Co = 27) 

Which one of the following characteristics of the transition metals is associated with their catalytic activity:

For the reaction: \(C_3H_8(g)+5O_2(g)→3CO_2(g)+4H_2O(l)\) at constant temperature, ∆H–∆E is:

Which of the following statements is not correct for sigma and pi-bonds formed between two carbon atoms: