List of top Chemistry Questions

The biodegradable polymer is:

The correct structure of tribromooctaoxide is:

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:

The compound that is most difficult to protonate is:

An alkene \("A"\) on reaction with \(O_3\) and \(Zn - H_2{0}\) given propanone and ethanol in equimolar ratio. Addition of \(HCI\) to alkene \("A"\) gives. \("B"\)as the major product. The structure of product \("B"\) is : 

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

Under isothermal condition, a gas at 300 K expands from 0.1 L. to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is: [Given that 1 L bar=100J]

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

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

Which is the correct thermal stability order for\( H_2E\) (E=O, S, Se, Te and Po)? 

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:

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 :

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

Identify the incorrect statement related to PCI from the following:

The most suitable reagent for the following conversion, is:

Which of the following is an amphoteric hydroxide?

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

Which will make basic buffer?

Which of the following species is not stable ?

The manganate and permanganate ions are tetrahedral, due to:

The value of x in the following chemical reaction is
\(C_3H_8 + xO_2 \rightarrow YCO_2 + zH_2O\)

Compounds with spin-only magnetic moment equivalent to five unpaired electrons are