1
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
2
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
3
IIT-JEE 1981
Subjective
+3
-0
The energy of the electron in the second and the third Bohr's orbits of the hydrogen atom is -5.42 $$\times$$ 10-12 erg and -2.41 $$\times$$ 10-12 erg respectively. Calculate the wavelength of the emitted radiation when the electron drops from the third to second orbit.
4
IIT-JEE 1981
MCQ (Single Correct Answer)
+1
-0.25
The correct order of second ionisation potential of carbon, nitrogen, oxygen and fluorine is
A
C > N > O > F
B
O > N > F > C
C
O > F > N > C
D
F > O > N > C
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