List of top Chemistry Questions

The hybrids of which group elements of the periodic table form electron precise hybrids?

Which of the following does not form a buffer solution?

For the reaction at 25° C, X₂O₄ (l) → 2XO₂(g), U and S are 2.1 K.Cal and 20 Cal/K respectively. what is G for the reaction at the same temperature? (R = 2 CAL K^-1MOL^-1)

Which one of the following has the same number of atoms as are in 6g of H₂O

The rate of diffusion of a gas A is √5 times more than of gas B. If the molar mass of A is x gmol^-1, the molar mass of B ( in g mole^-1) is

Match the following : List -I (Atomic number) List II (Group number and period number)

	List -I (Atomic number)		List II (Group number and period number)
A)	56	I)	9,4
B)	50	II)	3,6
C)	27	III)	14,5
D)	58	IV)	2,6

The number of electrons with (n+1) values equal to 3,4 and 5 in an element with atomic number (z) 24 are respectively (n = principal quantum number and l = azimuthal quantum number)

The energy of second orbit of hydrogen atom is -5.45x10^-19 J. What is the energy of first orbit of Li²⁺ ion (in J)

In the reaction :

Formation of X, formation of Y and Z are known by

Which one of the following oxoacids of phosphorus can reduce AgNO₃ to metallic silver ?

The correct decreasing order of basicity of hydrides of Group - 15 elements is

Which of the following system in an octahedral complex has maximum unpaired electrons?

Which formula and name combination is INCORRECT ?

\(aMnO^{-}_4+bS_2O_{3}^-+H_2O\rightarrow xMnO_2+ySO_{4}^-+zOH^-\)
a and y respectively are

Which of the following is CORRECT with respect to melting point of a transition element?

In solid state, PCl₅ is a/an

For Freundlich adsorption isotherm, a graph of log (x/m) Vs. log (P) gives a straight line. The slope of line and its Y-axis intercept respectively are

Aqueous solution of raw sugar when passed over beds of animal charcoal, it becomes colourless. Pick the correct set of terminologies that can be used for the above example.

	Adsorbent	Adsorbate	Process
(1)	Solution of Sugar	Animal Charcoal	Soprtion
(2)	Animal Charcoal	Solution of Sugar	Absorption
(3)	Animal Charcoal	Colouring Substance	Adsorption
(4)	Colouring Substance	Animal Charcoal	Adsorption

Which of the following compound does not give dinitrogen on heating ?

For the formation of which compound in Ellingham diagram ΔG° becomes more and more negative with increase in temperature ?

When FeCl₃ is added to excess of hot water gives a sol ‘X’. When FeCl₃ is added to NaOH_(aq) solution, gives sol ‘Y’.
X and Y formed in the above processes respectively are

The reducing agent in the given equations :
\(4\ Ag_{(s)}+8\ CN_{(aq)}^-+2H_2O_{(aq)}+O_{2_{(g)}}\rightarrow4[Ag(CN)_2]_{(aq)}^-+4\ OH_{(aq)}^-\)
\(2[Ag(CN)_2]_{(aq)}^-+Zn_{(s)}\rightarrow[Zn(CN)_4]_{(aq)}^{2-}+2Ag_{(s)}\)

Consider the following 4 electrodes
A : Ag⁺ (0.0001 M)/Ag_(s) ; B : Ag⁺ (0.1 M) / Ag_(s)
C : Ag⁺ (0.01 M)/Ag_(s) ; D : Ag⁺ (0.001 M) / Ag_(s); \(E^{\degree}_{Ag^{+/Ag}}\)=+ 0.80 V
Then reduction potential in volts of the electrodes in the order

For a reaction, the value of rate constant at 300 K is 6.0 ×10⁵ s^-1. The value of Arrhenius factor A at infinitely high temperature is :

During the electrolysis of brine, by using inert electrodes,