List of top Chemistry Questions

Which of the following statement(s) is/are correct for the following compound?

Consider a first order reaction 𝐴 → 𝐵. The initial concentration of 𝐴 is $100 mol L^{-1}$ and the value of first order rate constant is 0.01 $min^{-1}$. The concentration of 𝐴 after 10 min of reaction is ____ $ mol L^{-1}$ (rounded off to one decimal place).

Which one among the following metals is the weakest reducing agent?

Sum of oxidation states of bromine in bromic acid and perbromic acid is ——-.

For the adsorption of hydrogen on platinum, the activation energy is 30 kJ mol^-1 and for the adsorption of hydrogen on nickel, the activation energy is 41.4 kJ mol^-1 . The logarithm of the ratio of the rates of chemisorption on equal areas of the metals at 300 K is ……… (Nearest integer) Given: ln 10 = 2. 3  R = 8.3 JK^-1 mol^-1

Consider the graph of Gibbs free energy G vs Extent of reaction. The number of statement/s from the following which are true with respect to points (a), (b) and (c) is…

A. Reaction is spontaneous at (a) and (b)  
B. Reaction is at equilibrium at point (b) and nonspontaneous at point (c)  
C. Reaction is spontaneous at (a) and nonspontaneous at (c)  
D. Reaction is non-spontaneous at (a) and (b)

The number of species from the following which have square pyramidal structure is___
\(PF_5, BrF^− _4 4 − , IF_5\) ; \(BrF_5, XeOF_4, ICl ^−_ 4\)

the major product A and B from the the following reaction are

The major product formed in the following reaction is

Match List I with List II

	List I  Element detected		List II  Reagent used/ Product formed
A	Nitrogen	I	Na2[Fe(CN)5 NO]
B	Sulphur	II	AgNO3
C	Phosphorous	III	Fe4[Fe(CN)6]3
D	Halogen	IV	(NH4)2 MoO4

Choose the correct answer from the options given below:
 

Compound P is neutral. Q gives effervescence with NaHCO₃ while R reacts with Hinsbergs reagent to give solid soluble in NaOH. Compound P is

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R 
Assertion: Magnetic moment of [Fe(H2O)6]3+ is 5.92 BM and that of [Fe(CN)6]3– is 1.73 BM 
Reason: Oxidation state of Fe in both the complexes is +3. 
In the light of the above statements, choose the correct answer from the options given below

The standard electrode potential of M^+/M in aqueous solution does not depend on

Match the terms in Column-I with their description in Column-II:

Column-I		Column-II
P	N2O5	(i)	N–N bond
Q	N2O	(ii)	N–O–N bond
R	N2O4	(iii)	N=N / N≡N bond
S	NO2	(iv)	N=O bond

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Radius of H⁺ is 1.5 × 10^–3 pm
Reason (R) : H⁺ cannot exist independently
In the light of the above statements, write the detailed answer:

The difference between electron gain enthalpies will be maximum between

Oxidation state of Cr in chromyl chloride is:

The homoleptic and octahedral complex of Co²⁺ and H₂O has___ set of orbitals. unpaired electron(s) in the t_2g set of orbitals.

The total change in the oxidation state of manganese involved in the reaction of KMnO₄ and potassium iodide in the acidic medium is______

20 mL of 0.5 M NaCl is required to coagulate 200 mL of As2S3 solution in 2 hours. The coagulating value of NaCl is____

For a reversible reaction A ⇌ B, the ΔH_{forward reaction} = 20 kJ mol^-1. The activation energy of the uncatalysed forward reaction is 300 kJ mol^-1. When the reaction is catalysed keeping the reactant concentration same, the rate of the catalysed forward reaction at 27°C is found to be same as that of the uncatalysed reaction at 327°C. The activation energy of the cataysed backward reactoion is ____ kJ mol^-1.

Lowering of vapour pressure of 30% of aqueous solution of glucose. (in mmHg) 
Given: PH₂O = 760 mm of Hg

30.4 kJ is required to melt one mole of sodium chloride. The entropy change during melting is 28.4 JK-1 mol-1 . atm The melting point of sodium chloride Calculate is ___ K(Nearest Integer).