At 380oC, the half-life period for the first order decomposition of H2O2 is 360 min. Calculate the time required for 75% decomposition at 450oC.
Answer
(B)
20.34 min
1
Number of paired electrons in O2 molecules is
Answer
(D)
14
2
An excess of liquid mercury is added to an acidified solution of 1.0 $$\times$$ 10-3 M Fe3+. It is found that 5% of Fe3+ remains at equilibrium at 25oC. Calculate $$E_{Hg_2^{2 + }|\,Hg}^o$$, assuming that only reaction that occurs is
2Hg + 2Fe3+ $$\to$$ $$Hg_2^{2+}$$ + 2Fe2+
(Given $$E_{F{e^{3 + }}|\,F{e^{2 + }}}^o$$ = 0.77 V)
Answer
(B)
0.798 V
2
Which one is most ionic
Answer
(C)
MnO
3
A 5.0 cm3 solution of H2O2 liberates 0.508 g of iodine from an acidified KI solution. Calculate the strength of H2O2 solution in terms of volume strength at STP.
Answer
(B)
4.48 volumes
3
Which has most stable +2 oxidation state?
Answer
(B)
Pb
4
Iodine molecule dissociates into atoms after absorbing light of 4500 Å. If one quantum of radiation is absorbed by each molecule, calculate the kinetic energy of iodine atoms. (Bond energy of I2 = 240 kJ mol-1)
