List of practice Questions

The value of θ in the range 0 ≤ θ ≤ π/2 which satisfies the equation sin (θ + π/6) = cosθ is equal to

Let X be the set {1, π, {42, √2}, {1,3}}. Which of the following statement(s) is/are true? Ρ : π ∈X , Q :{1,3} ⊆ X , R : {1,7} ⊆ X 

The set of all integer values of x that satisfy the inequality 19 ≤ 3x ≤ 27 is

Among the following, the alkene that exhibits optical isomerism is

In the estimation of nitrogen present in an organic compound, Kjeldahl's method cannot be applied to

Which one of the following is an ore of aluminium?

The complex ion formed when the film developed in black and white photography is washed with hypo solution is

In which one of the following complexes, the conductivity corresponds to 1:2 electrolyte in aqueous solution?

The metal that has the highest melting point in the first series of transition elements is

In the first row transition metals, the element that exhibits only +3 oxidation state is

The magnetic moment of a trivalent ion of a metal with Z = 24 in aqueous solution is

Choose the wrong statement in the following with regard to orthoboric acid:

Choose the correct choice containing true statements regarding $PCI_5$.
(i) PCI, is prepared by the reaction of white phosphorus with excess of dry chlorine. 
(ii) The complete hydrolysis of PCI, gives phosphoric acid.  
(iii) PCI, has square pyramidal structure in gaseous phase. 
(iv) All the five bonds in PCI, molecule are equivalent.

'Syngas' produced from sewage is a gaseous mixture of

When zinc metal is reacted with aqueous sodium hydroxide, the products formed are

Which one of the following is true?

Choose the correct set of reactions which follow first order kinetics:
(i) Thermal decomposition of HI on gold surface.
(ii) Thermal decomposition of $N_2O_5(g)$ at constant volume.
(iii) Hydrogenation of ethene.
(iv) Decomposition of $NH_3$ on a hot Pt surface.
(v) Thermal decomposition of $SO_2Cl_2(g)$ at constant volume.

For the reaction 2P+Q ⇌ P_2Q, the rate of formation of $P_2Q is 0.24 $mol dm^{-3}s^{-1}$. Then the rates of disappearance of P and Q respectively are

The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non- volatile, non-electrolyte solid weighing 1.0 g when added to 39.0 g of benzene (molar mass 78 $g mol^{-1}$), vapour pressure of the solution is reduced to 0.845 bar. What is the molar mass of the solid substance?

A scientist wants to perform an experiment in aqueous solution in a hill station where the boiling point of water is 98.98°C. How much urea $(mol.wt \,60 g\, mol^{-1})$ is to be added by him to 2 kg of water to get the boiling point 100°C at the same place? ($K_b$ of water=0.51$K kg mol^{-1}$)

Which of the following is an example of disproportionation redox reaction? 

The SI unit of molar conductivity is

The following concentrations were obtained for the formation of $NH_3(g)$ from $N_2(g)$ and $H_2(g)$ at equilibrium and at 500K: $[N_2] 1×10^{-2} M, [H_2] -2×10^{-2} M$ and $[NH_3]=2×10^{-2} M$. The equilibrium constant, K., for the reaction
$N_2(g)+3H_2(g)2NH; (g)$ at 500K is

In which one of the following equilibria $Δn_g$ value is zero?

The enthalpy change for the evaporation of a liquid at its boiling point 127°C is +40.32 $kJmol^{-1}$. What is the value of internal energy change for the above process at 127°C? (R=8.3 $JK^{-1}mol^{-1}$)