List of top Chemistry Questions asked in NEET (UG)

Aniline is reacted with bromine water and the resulting product is treated with an aqueous solution of sodium nitrite in presence of dilute hydrochloric acid. The compound so formed is converted into a tetrafluoroborate which is subsequently heated. The final product is
The second order Bragg diffraction of X-rays with $\lambda = 1.0 \mathring{A}$ from a set of parallel planes in a metal occurs at an angle $60^\circ$. The distance between the scattering planes in the crystals is
In the reaction, $4NH_3 (g) + 5O_2 \rightarrow 4NO(g) + 6H_2O (I)$ When 1 mole of ammonia and 1 mole of $O_2$ are made to react to completion, then
The Activation energy of a chemical reaction can be determined by
A 5% solution of cane sugar (MW = 342) isisotonic with 1% solution of substance X. The molecular weight of X is
Which one is not paramagnetic among the following? [at. no. of $Be = 4, N e = 10$ , $A s= 33,Cl= 17$]
Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200 g. The number of iron atoms (at. weight of Fe is 56) present in one molecule of haemoglobin are
The number of antibonding electron pairs in $O_2^{2-}$ molecular ion on the basis of molecular orbital theory is (at. no. of $O$ is $18$)
Which one of the following elements constitutes a major impurity in pig iron?
The total number of possible isomers for the complex compound $[Cu^{II}(NH_3)_4] [Pt^{II}Cl_4] $ are
Glucose reacts with X number of molecules of phenyl hydrazine to yield osazone. The value of $ X $ is
The enormous diversity of protein molecules is due mainly to the diversity of
Which of the following compounds is not chiral ?
A one litre flask is full of brown bromine vapours. The intensity of brown colour of vapours will not decrease appreciably on adding to the flask some
In $ PO_{4}^{3-} $ ion, the formal charge on each oxygen atom and $P-O$ bond order respectively are :
The cylindrical shape of an alkyne is due to
Haemoglobin is
The ion which is isoelectronic with CO is
The electronic configuration of gadolinium (at. no. = 64) is
The most common indicator organism that represents polluted water is
The CO2 content by volume, in the atmospheric air is about
The molecule which does not exhibit dipole moment is
The intermetallic compound $LiAg$ crystallises in cubic lattice in which both lithium and silver have coordination number of eight. The crystal class is
The most stable configuration of n-butane will be
Which of the following techniques is most suitable for purification of cyclohexanone from a mixture containing benzoic acid, isoamyl alcohol, cyclohexane and cyclohexanone?