List of top Chemistry Questions

A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is :

A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is:

The method used to remove temporary hardness of water is : (1) (2) (3) (4)

Which of the following diatomic molecular species has only bonds according to Molecular Orbital Theory?

The correct order of the basic strength of methyl substituted amines in aqueous solution is:

Which of the following reactions are disproportionation reaction?
a)\(2Cu^{+}\rightarrow Cu^{2+}+Cu^{0}\)
\(b)3MnO_4^{2-}+4H^{+} \rightarrow2MnO_4^{-}+MnO_2+2H_2O\)
\(c)2KMnO_4\frac{\Delta}{\rightarrow}K_2MnO_4+MnO_2+O_2\)
\(d)2MnO_4^{-}+3Mn^{2+}+2H_2O \rightarrow 5MnO_2+4H^\oplus\)
Select the correct option from the following:

If the rate constant for a first order reaction is k the time (t) required for the completion of 99% of the reaction is given by:

Among the following, the reaction that proceeds through an electrophilic substitution, is:

Conjugate base for Brönsted acids \(H_2O\) and \( HF\) are

For the cell reaction
\(2Fe^{3+}+2I^{-}_{(aq)}\rightarrow2Fe^{2+}+I_2{(aq)}\)
\(E^{\ominus}_{cell}=0.24\ V \ at \ 298 k.\)The standard Gibbs energy \((\Delta_rG^{\ominus})\) of the cell reaction is:
[Given that Faraday constant \( F=96500 \ C\ mol^{-1}]\)  

The non-essential amino acid among the following is:

Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor. M is:

Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?

What is the correct electronic configuration of the central atom in \(K_4[Fe(CN)_6]\) based on crystal field theory?

For the second period elements the correct increasing order of first ionisation enthalpy is :

Match the Xenon compounds in Column-I with its structure in Column II and assign the correct code:

Column I		Column II
A	\(XeF_4\)	I	pyramidall
B	\(XeFe_6 \)	II	square planar
C	\(XeOF_4  \)	III	distorted octahedral
D	\(XeO_3\)	IV	square pyramidal

Code:

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is:

Identify the incorrect statement related to PCI from the following:

The structure of intermediate A in the following reaction, is;

Among the following, the one that is not a green house gas is

In which case change in entropy is negative? (1)(2) (3 (4)

The most suitable reagent for the following conversion, is:

Which of the following is an amphoteric hydroxide?

Which mixture of the solutions will lead to the formation of negatively charged colloidal [Agl]I- Sol.? (

Which will make basic buffer?