List of top Chemistry Questions on Hydrogen asked in JEE Main

For hydrogen-like species, which of the following graphs provides the most appropriate representation of $ E $ vs $ Z $ plot for a constant $ n $?
[E : Energy of the stationary state, Z : atomic number, n = principal quantum number]

Consider the following data:
- Heat of formation of $ CO_2(g) $ = -393.5 kJ mol$^{-1}$
- Heat of formation of $ H_2O(l) $ = -286.0 kJ mol$^{-1}$
- Heat of combustion of benzene = -3267.0 kJ mol$^{-1}$
The heat of formation of benzene is ……… kJ mol$^{-1}$ (Nearest integer).

Which of the following is/are correct with respect to the energy of atomic orbitals of a hydrogen atom?
(A) $ 1s<2s<2p<3d<4s $
(B) $ 1s<2s = 2p<3s = 3p $
(C) $ 1s<2s<2p<3s<3p $
(D) $ 1s<2s<4s<3d $
Choose the correct answer from the options given below:

An ideal gas undergoes a cyclic transformation starting from point A and coming back to the same point by tracing the path A→B→C→D→A as shown in the three cases below.

Choose the correct option regarding $\Delta U$:

The ratio of magnitude of potential energy and kinetic energy for $5^{th}$ excited state of hydrogen atom is

But-2-yne is reacted separately with one mole of Hydrogen as shown below:

A. A is more soluble than B
B. B The boiling point & melting point of $A$ are higher and lower than $B$ respectively
C. A is more polar than $B$ because dipole moment of $A$ is zero
D. $Br _2$ adds easily to $B$ than $A$
Identify the incorrect statements from the options given below:

$56.0 \,L$ of nitrogen gas is mixed with excess of hydrogen gas and it is found that $20\, L$ of ammonia gas is produced The volume of unused nitrogen gas is found to be _______ $L$

If wavelength of the first line of the Paschen series of hydrogen atom is _____ nm, then the wavelength of the second line of this series is nm (Nearest integer)

High purity $(>9995 \%)$ dihydrogen is obtained by

All structures given below are of vitamin $C$ Most stable of them is :

Correct order of strength of H-bond in the following -:
(A) Liquid water
(B) Ice
(C) Impure water

In which of the following reactions the hydrogen peroxide acts as a reducing agent?

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 starting material for convenient preparation of deuterated hydrogen peroxide $\left(D_2 O _2\right)$ in laboratory is :

Match the terms in Column-I with their description in Column-II and choose the correct option:

	Column 1(Type of hydride)		Column II
A.	Electron	1.	MgH₂
B.	Electron precise	2.	HF
C.	Electron rich	3.	CH₄
D.	Saline Hydride	4.	B₂H₆

Which of the following acts as a stabilizer in the decomposition of H₂O₂?

Least stable Hydride is?

Assertion (A) : Radius of H+ is 1.5 × 10^–3 pm.
Reason (R) : H+ cannot exist independently.

Given below are two statements:
Statement I: Methane and steam passed over a heated Ni catalyst produces hydrogen gas.
Statement II: Sodium nitrate reacts with NH$_4$Cl to give H$_2$O and NaCl.

Which of the given compounds can enhance the efficiency of hydrogen storage tank?

The shortest wavelength of hydrogen atom in Lyman series is λ. The longest wavelength in Balmer series of He⁺ is

The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives:

The metal salts formed during softening of hardwater using Clark's method are :

Which of the following is NOT an example of synthetic detergent?

The products obtained during treatment of hard water using Clark’s method are: