List of top Chemistry Questions

The decomposition of NH3 on platinum surface is zero order reaction. If k = 2.5 x 10-4 mol L-1 s-1 the rate of production of H2 is

The molecularity of the following elementary reaction is NH4NO2 —> N2 + 2H20

Rate constant "k" for a certain reaction is k = $2.3 \times 10^{-5}$ $L$ $mol^{-1}$ $s^{-1}$. Order of the reaction is:

Consider the 1M aqueous solution of the following compounds and arrange than in the increasing order of elevation in the boiling points.
A. $C_6H_{12}O_6$
B. $NaCl $
C. $MgCl_2 $
D. $AlCl_3$
E. $Al_2(SO_4)_3 $
Choose the correct answer from the options given below:

Which simple chemical test is used to distinguish between ethanal & propanal?

Atoms of element B form hcp lattice and those of the element A occupy 2/3 rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?

Arrange the following compounds in increasing order of their acid strength:
A. $Propan- 1- ol$
B. $3- nitrophenol$
C. $3, 5- dinitrophenol$
D. $Phenol$
E. $4 - Methylphenol$
Choose the correct answer from the options given below:

Which of the following is not the characteristic of physisorption?

The metal refined by Van Arkel method is

The products formed at cathode and anode by electrolysis of aqueous NaCl solution respectively are

Magnetic moment of a divalent ion in aqueous solution of an element with atomic number 25 is:

Among the following statements. choose the correct statements.
A. Boiling point of alcohols increases with increase in the number of carbon atoms.
B. In alcohols, boiling points increases with increase of branching in carbon chain.
C. Boiling points of alcohols are lesser in comparison to haloalkanes of comparable molecular mass.
D. Boiling points of alcohols are higher in comparison to hydrocarbons of comparable molecular mass.
E. The high boiling points of alcohols are mainly due to the presence of intramolecular hydrogen bonding.
Choose the correct answer from the options given below:

The formula of a noble gas species which is isostructural with BrO-3 is:

$250$ $g$ solution of $D-glucose$ in water contains 10.8% of carbon by weight. The molality of the solution is nearest to (Given: Atomic Weights are, $H, 1 u; C, 12 u; O, 16 u$)

The limiting molar conductivities of $NaI$, $NaNO_3$ and $AgNO_3$ are $12.7$, $12.0$ and $13.3$ mS m² mol^–1, respectively (all at 25°C). The limiting molar conductivity of $AgI$ at this temperature is ____ mS m² mol^–1.

A rigid nitrogen tank stored inside a laboratory has a pressure of 30 atm at 06:00 am when the temperature is 27°C. At 03:00 pm, when the temperature is 45°C, the pressure in the tank will be _______ atm. [nearest integer]

Given below are two statements :
Statement-I : For KI, molar conductivity increases steeply with dilution.
Statement-II : For carbonic acid, molar conductivity increases slowly with dilution.
In the light of the above statements, choose the correct answer from the options given below :

If the solubility product of PbS is 8 × 10^–28, then the solubility of PbS in pure water at 298 K is x × 10^–16mol L^–1. The value of x is ________. (Nearest integer)
[given : $\sqrt2=1.41$]

Class XII students were asked to prepare one litre of buffer solution of pH $8.26$ by their Chemistry teacher. The amount of ammonium chloride to be dissolved by the student in $0.2$ M ammonia solution to make one litre of the buffer is (Given : $pK_b$ $(NH_3)$ = $4.74$, Molar mass of $NH_3$ = $17$ g $mol^{–1}$, Molar mass of $NH_4Cl$ = $53.5$ $g$ $mol^{–1}$)

Consider the following set of quantum numbers.
$n \,|\, m_|$
A. 3 3 –3
B. 3 2 –2
C. 2 1 +1
D. 2 2 +2
The number of correct sets of quantum numbers is _____.

The correct stability order of the following diazonium salt is

correct stability order of the diazonium salt

Given below are two statements.
Statement I: The presence of weaker π-bonds make alkenes less stable than alkanes.
Statement II: The strength of the double bond is greater than that of carbon-carbon single bond.
In the light of the above statements, choose the correct answer from the options given below.

Match List-I with List-II.

List-I (Metal)	List-II (Emitted light wavelength (nm))
(A) Li	(I) 670.8
(B) Na	(II) 589.2
(C) Rb	(III) 780.0
(D) Cs	(IV) 455.5

Choose the most appropriate answer from the options given below:

2 L of 0.2 M $H_2SO_4$ is reacted with 2 L of 0.1 M NaOH solution, the molarity of the resulting product $Na_2SO_4$ in the solution is _______ millimolar. (Nearest integer)

Total number of isomers (including stereoisomers) obtained on monochlorination of methylcyclohexane is____.