List of top Questions asked in NEET (UG)

Which of the following species is not stable ?

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 mixture that forma maximum boiling azeotrope is :

Which one is malachite from the following?

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

The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is

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 \( F=96500 \ C\ mol^{-1}]\)  

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 : 

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

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

The correct structure of tribromooctaoxide is:

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

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

The compound that is most difficult to protonate is:

\(pH\) of a saturated solution of \(Ca(OH)_2\) is \(9\). The solubility product \((K_{sp})\) of \( Ca(OH)_2\) is: 

Which of the following is an amphoteric hydroxide?

The manganate and permanganate ions are tetrahedral, due to:

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]

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

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

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:

Which will make basic buffer?

The number of \(\sigma \)and \(\pi\) bonds in pent-2-en-4-yne is: 

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

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