1
IIT-JEE 1999
MCQ (Single Correct Answer)
+2
-0.5
The oxidation number of sulphur in S8,S2F2,H2S respectively, are
A
0, +1 and -2
B
+2, +1 and -2
C
0, +1 and +2
D
-2, +1 and -2
2
IIT-JEE 1992
MCQ (Single Correct Answer)
+1
-0.25
For the redox reaction:
$$MnO_4^ - + {C_2}O_4^{ - 2} + {H^ + }$$ $$ \to M{n^{2 + }} + C{O_2} + {H_2}O$$
The correct coefficients of the reactants for the balanced reaction are
A
$$MnO_4^ - \,\, \to \,\,2,\,\,{C_2}O_4^{2 - }\, \to \,\,5,\,{H^ + } \to \,\,16$$
B
$$MnO_4^ - \,\, \to \,\,16,\,\,{C_2}O_4^{2 - }\, \to \,\,5,\,{H^ + } \to \,\,2$$
C
$$MnO_4^ - \,\, \to \,\,5,\,\,{C_2}O_4^{2 - }\, \to \,\,16,\,{H^ + } \to \,\,2$$
D
$$MnO_4^ - \,\, \to \,\,2,\,\,{C_2}O_4^{2 - }\, \to \,\,16,\,{H^ + } \to \,\,5$$
3
IIT-JEE 1991
MCQ (Single Correct Answer)
+1
-0.25
The oxidation state of the most electronegative element in the products of the reaction. BaO2 with dil. H2SO4 are
A
0 and -1
B
-1 and -2
C
-2 and 0
D
-2 and -1
4
IIT-JEE 1991
MCQ (Single Correct Answer)
+2
-0.5
Read the following statement and explanation and answer as per the options given below:

STATEMENT (S): In the titration of Na2CO3 with HCl using methyl orange indicator, the volume required at the equivalence point is twice that of the acid required using phenolphthalein indicator.

EXPLANATION (E): Two moles of HCl are required for the complete neutralization of one mole of Na2CO3
A
Both S and E are true, and E is the correct explanation of S.
B
Both S and E are true, and E is not the correct explanation of S.
C
S is true but E is false
D
S is false but E is true
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