List of top Questions asked in NEET (UG)- 2018

Considering Ellingham diagram, which of the following metals can be used to reduce alumina ?
The correct order of atomic radii in group 13 elements is
In the structure of ClF3 , the number of lone pairs of electrons on central atom ‘Cl’ is
The correct order of N-compounds in its decreasing order of oxidation states is
Which of the following statements is not true for halogens ?
Which one of the following elements is unable to form MF63-ion ?
Regarding cross-linked or network polymers, which of the following statements is incorrect ?
Nitration of aniline in strong acidic medium also gives m-nitroaniline because
Which of the following oxides is most acidic in nature ?
The difference between amylose and amylopectin is
A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4 . The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be
In the reaction
the electrophile involved is
the electrophile involved is
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their
Compound A, C8H10O, is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell.
A and Y are respectively
Which of the following molecules represents the order of hybridisation sp2 , sp2 , sp, sp from left to right atoms ?
Which of the following carbocations is expected to be most stable ?
Which of the following is correct with respect to – I effect of the substituents ? (R = alkyl)
The type of isomerism shown by the complex [CoCl2(en)2] is
Which one of the following ions exhibits d-d transition and paramagnetism as well ?
Iron carbonyl, Fe(CO)5 is
Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :
Column IColumn II
a.Co3+i.\(\sqrt8\) B.M.
b.Cr3+ii.\(\sqrt{35}\) B.M.
c.Fe3+iii.\(\sqrt3\) B.M.
d.Ni2+iv.\(\sqrt{24}\) B.M.
  v.\(\sqrt{15}\) B.M.
The geometry and magnetic behaviour of the complex [Ni(CO)4] are
The correct difference between first- and second-order reactions is that
Among CaH2 , BeH2 , BaH2 , the order of ionic character is
In which case is the number of molecules of water maximum ?