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NEET Chemistry Solved Question Paper 2018

Multiple Choice Questions

11.

Which of the following is correct with respect to – I effect of the substituents? (R = alkyl)

-NH₂ <- OR < - F
-NR₂ <- OR <-F
-NR₂ >-OR>-F
-NH₂>-OR>-F

12.

In which case is a number of molecules of water maximum?

18 mL of water
0.18 g of water
10^-3 mol of water
0.00224 L of water vapours at 1 atm and 273K

13.

Among CaH₂, BeH₂, BaH₂, the order of ionic character is

BeH₂< CaH₂<BaH₂
CaH₂<BeH₂<BaH₂
BaH₂<BeH₂<CaH₂
BeH₂ < BaH₂ < CaH₂

14.
For the redox reaction
$M n O_{4}^{-} + C_{2} O_{4}^{- 2} + H^{+} \overset{}{\to} M n^{2 +} + C O_{2} + H_{2} O$
The correct coefficients of the reactants for the balanced equation are

$M n O_{4}^{-}$ $C_{2} O_{4}^{2 -}$ H⁺

16 5 2

MnO₄^- C₂O₄^2- H⁺

2 5 16

MnO₄^- C₂O₄^2- H⁺

5 16 2

MnO₄^- C₂O₄^2- H⁺

2 16 5

MnO₄^-	C₂O₄^2-	H⁺
2	5	16

$\overset{+ 7}{M n} O_{4}^{-} \overset{}{\to} \overset{+ 2}{M} n^{2 +}; 5 e^{-} g a i n . . . (i) {\overset{+ 3}{C}}_{2} O_{4}^{2 -} \overset{}{\to} \overset{+ 4}{C} O_{2}; 2 e^{-} l o s s . . . (i i) M u l t i p l y i n g (i) a n d 2 a n d (i i) b y 5 t o b a l a n c e e^{-} 2 M n O_{4}^{-} + 5 C_{2} O_{4}^{2 -} \overset{}{\to} 2 M n^{2 +} + 10 C O_{2} O n b a l a n c i n g c h a r g e; 2 M n O_{4}^{-} + 5 C_{2} O_{4}^{2 -} + 16 H^{+} \overset{}{\to} 2 M n^{2 +} + 10 C O_{2} + 8 H_{2} O$

15.

Which one of the following elements is unable to form $M F_{6}^{- 3}$ ion?

16.

Considering the Ellingham diagram, which of the following metals can be used to reduce alumina?

17.

Which of the following statements is not true for halogens?

All form monobasic oxyacids
All are oxidizing agents
Chlorine has the highest electron-gain enthalpy
All but fluorine show positive oxidation states

18.

In the structure of ClF₃, the number of lone pair of electrons on central atom ‘Cl’ is

One
Two
Three
Four

19.

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 gram) of the remaining product at STP will be