21.

Oxidation state of iron in haemoglobin is

• 0

• +2

• -2

• +3

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

Bleaching powder does not contain

• CaCl₂

• Ca(OH)₂

• Ca(OCl)₂

• Ca(ClO₃)₂

Which of the following ion does not exist?

• [CuI₄]^2-

• VO${}_4^{3-}$

• WO${}_4^{2-}$

• CrO${}_4^{2-}$

Which of the following is not a green house gas?

• Hydrogen

• Carbon dioxide

• Methane

• Nitrous oxide or N₂O

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

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

• 

• 

• Meso compounds

• both (b) and (c)

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

• 1 volume

• 10 volume

• 5 volume

• 7 volume

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.

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.