CBSE
Multiple Choice QuestionsOxidation state of Fe in Fe3O4 is :
3/2
5/4
4/5
8/3
Assertion: Stannous chloride gives a grey precipitate with mercuric chloride, but stannic chloride does not do so.
Reason: Stannous chloride is a powerful oxidising an agent which oxidises mercuric chloride to metallic mercury.
If both assertion and reason are true and the reason is a correct explanation of the assertion.
If both the assertion and reason are true but the reason is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both the assertion and reason are false.
The ratio of Fe2O3 and Al, in thermite is :
1 : 3
1 : 2
3 : 1
none of these
Which of the following reaction is a redox reaction ?
P2O5 + 2H2O H4P2O7
2AgNO3 + BaCl2 2AgCl + Ba(NO3)2
BaCl2 + H2SO4 BaSO4 + 2HCl
Cu + 2AgNO3 Cu(NO3)2 + 2Ag
Assertion : PbI4 is a stable compound.
Reason : Iodide stabilizes higher oxidation state.
If both assertion and reason are true and the reason is the correct explanation of the assertion
If both assertion and reason are true and the reason is not the correct explanation of the assertion
If assertion is true but reason is false
If both assertion and reason are false.
How many electrons are involved in oxidation of KMnO4 in basic medium ?
1
2
5
3
What is 'A' in the following reaction ?
2Fe3+(aq) + Sn2+(aq) 2Fe2+(aq) + A
Sn3+(aq)
Sn4+(aq)
Sn2+(aq)
Sn
Assertion : Solution of Na2CrO4 in water is coloured.
Reason : Oxidation state of Cr in Na2CrO4 is +6.
If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true and the reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion : Ozone is a powerful oxidising agent in comparison to O2.
Reason : Ozone is diamagnetic but O2 is paramagnetic.
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.
What is the oxidation number of chlorine in ClO3- ?
+ 5
+ 3
+ 4
+ 2
