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NEET Chemistry Solved Question Paper 2013

Multiple Choice Questions

21.

Oxidation state of iron in haemoglobin is

0
+2
-2
+3

22.

Which of the following statement is not true for hydrolysis of XeF₆?

XeOF₄ is formed.
XeO₂F₂ is formed.
It is a redox reaction.
XeO₃ is formed

23.

Bleaching powder does not contain

CaCl₂
Ca(OH)₂
Ca(OCl)₂
Ca(ClO₃)₂

24.

Which of the following ion does not exist?

[CuI₄]^2-
VO $_{4}^{3 -}$
WO $_{4}^{2 -}$
CrO $_{4}^{2 -}$

25.

Which of the following is not a green house gas?

Hydrogen
Carbon dioxide
Methane
Nitrous oxide or N₂O

26.
Arrange the following compounds in increasing order of reactivity towards nucleophilic addition reaction.
(I) C₆H₅COCH₃
(II) CH₃CO-C₂H₅
(III) C₆H₅CHO
(IV) Cl-CH₂-CHO

IV > III > II > I

IV > II > III > I

I > II > III > IV

III > IV > II > I

IV > III > II > I

Two electron releasing alkyl groups in ketones make the carbon less electron deficient as compared to aldehydes. Therefore, ketones are less reactive than aldehydes towards nucleophilic adciition reactions.

Aromatic aldehydes and ketones are less reactive than corresponding aliphatic aldehydes and ketones due to +R effect of benzene ring. Aromatic aldehydes are more reactive than alkyl aryl ketones which in turn are more reactive than diaryl ketones.

Since -Cl is more electronegative than carbon, it increases the reactivity. So, the correct order is

Cl-CH₂-CHO > C₆H₅CHO > CH₃COC₂H₅ > C₆H₅COCH₃

27.

When trans-2-butene is reacted with Br₂ then product formed is

Meso compounds
both (b) and (c)

28.

Strength of H₂O₂ is 15.18 g L^-1, then it is equal to

1 volume
10 volume
5 volume
7 volume

29.

Assertion : Cu is stronger reducing agent than H₂.

Reason : E° of Cu²⁺/Cu is negative.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

30.

Assertion : Phosphoric acid has no reducing properties.

Reason : Phosphoric acid does not contain P-H bonds.

If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.