1
IIT-JEE 1981
MCQ (Single Correct Answer)
+1
-0.25
1 mole of N2H4 loses 10 moles of electrons to form a new compound Y. assuming that all nitrogen appears in the new compound , what is the oxidation state of nitrogen in Y ? (there is no change in the oxidation state of hydrogen)
A
-1
B
-3
C
+3
D
+5
2
IIT-JEE 1981
Subjective
+3
-0
Balance the following Equations:

(i) Cu2O + H+ + $$NO_3^ - \to $$ Cu2+ + NO + H2O

(ii) K4[Fe(CN)6] + H2SO4 + H2O $$\to$$ K2SO4 + FeSO4 + (NH4)2SO4 + CO

(iii) C2H5OH + I2 + OH- $$\to$$ CHI3 + $$HCO_3^-$$ + I- + 4H2O
3
IIT-JEE 1981
Subjective
+3
-0
A 1.00 gm sample of H2O2 solution containing X percent H2O2 by weight requires X ml of a KMnO4 solution for complete oxidation under acidic conditions. Calculate the normality of the KMnO4 solution.
4
IIT-JEE 1981
MCQ (Single Correct Answer)
+1
-0.25
Rutherford's experiment on scattering of $$\alpha-particles$$ showed for the first time that the atom has
A
electrons
B
protons
C
nucleus
D
neutrons
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