List of top Chemistry Questions

Novolac is formed by the polymerisation of monomer 'x' in the presence of OH– ions. What is 'x'?
How many of the following lanthanide elements exhibit +4 oxidation state?
Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy
In the extraction of iron from haematite, the impurity (x) of the ore is removed in the form of 'y'.
What are x and y respectively?
In Buckminster fullerene, the number of six-membered carbon rings is ‘x’ and five-membered carbon rings is ‘y’. What is the value of (x + y)?
The incorrect statement from the following is
The incorrect statement in the following is:

At 25\(^\circ\)C, the percentage of ionization of 'x' M acetic acid is 4.242. What is the value of x? \((K_a = 1.8 \times 10^{-5})\)

Identify the correct statements from the following:
I) Work is a path function.
II) Enthalpy is an extensive property.
III) Lattice enthalpy of ionic compounds can be obtained from Born–Haber cycle.

The most probable speed \(u_{mp}\) of 8 g of H\(_2\) is \(2 \times 10^2\) ms\(^{-1}\). The kinetic energy (in J) of the same amount of H\(_2\) gas is

At T(K), a gaseous mixture contains H\(_2\) and O\(_2\). The total pressure of the mixture is 2 bar. The partial pressure of H\(_2\) is 1.778 bar. What is the weight (w/w) percentage of H\(_2\) in the mixture?
Which of the following sets of quantum numbers is not possible for the electron?

Which of the following represents Gattermann reaction?

The incorrect statement about the product ‘Z’ in the given reaction sequence is

What is the major product Y in the following reaction sequence?

A halide with formula C6H13Br gave two isomeric alkenes A and B on dehydrobromination. On ozonolysis of mixture of A and B the following compounds were obtained: CH3COCH3, CH3CHO, CH3CH2CHO and (CH3)2CHCHO. The halide is:

The correct statement regarding the mechanism involved in the above reactions is

Match the following:

List-I (reaction)List-II (catalyst)
A) SO2(g) + Cl2(g) → SO2Cl2(l)I) Pt / Rh gauge
B) 2SO2(g) + O2(g) → 2SO3(g)IV) V2O5
C) 4HCl + O2 → 2Cl2 + 2H2OII) CuCl2
D) 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)III) Charcoal
Identify the correct statements from the following:
I) In adsorption process, both enthalpy and entropy decrease.
II) In general, physisorption is an irreversible process.
III) The catalyst used in the decomposition of potassium chlorate is manganese dioxide.
When 3 amp current was passed through an aqueous solution of salt of a metal M (atomic weight 106.4 u) for 1 hour, 2.977 g of Mn+ was deposited at cathode. The value of n is (1 F = 96500 C mol-1)
Which of the following metals is used for measuring high temperatures?

Match the following:

List - I (Metal) List - II (Flame colour) 
A)LiI)Crimson red
B)NaII)Yellow
C)CaIII)Brick red
D)BaIV)Apple green
Identify the incorrect statement regarding artificial sweeteners.
The SN$_2$ reactivity of the following compounds will be in the order:
I) C$_6$H$_5$CH(CH$_3$)Br
II) (C$_6$H$_5$)$_2$CHBr
III) (C$_6$H$_5$)$_2$C(CH$_3$)Br
IV) C$_6$H$_5$CH$_2$Br
What are X and Y in the following set of reactions?
(dry acetone)
Y’ in the following reaction sequence
Identify the end product 'Y' in the given reaction sequence:
end product 'Y' in the given reaction