In the electrolysis of CuSo4(g) using platinum electrode the reaction at the anode is
4H+ 4e - 2H2
4OH= 4e- + 2H2O + O2
2OH - 2e- = 2OH
2OH- + 2OH = 2H2O + O2
Correct answer is B
40H − 4e → 2H2O + O2is the reaction of sun at the anode in the electrolysis of CuSO4 (g) using platinum particles. Option A,C,D are not formed as a result of the equation
20
25
60
75
Correct answer is B
Let the relative abundance of the energy with mass 37 be
Total relative abundance of the isotope of mass 359100-k)
Total mass of isotope of mass 37-37x, while that of 35-359(100x)
-37x + 3500 − 35 − 35.5
-37x + 3500 − 35n − 35.5
Mean mass of chlorine atom − (2n + 3500)/ ÷ 100
= 35.5
2x + 3500 − 3550yx = 50/2
Chlorine gas turns damp starch-iodide paper
pink
colourless
red
dark blue
Correct answer is D
Chlorine turns a damp starch iodide paper into dark blue or blue black.
N2O4(g)→ 2NO2(g)
In the endothermic reaction above, more products formed will be favored by
A constant values
an increase in pressure
a decrease pressure
a decrease volume
Correct answer is C
A decrease in pressure will result in the breaking or splitting of a larger molecule into a simpler ones. Options A, B, D are not in conformance to the reaction
what is the pH of 0.00lmoldm3 solution of sodium hydroxide
14
13
12
11
Correct answer is D
[H+][OH−] = 10 − 4
[H+] =10 − 14 ÷ [OH+]
=10 −14 ÷ (1 × 10 − 3) = 10 − 11
pH = − log10[H+ ]
= − log10[10 − 11] = − 1 × −11
log10[10 − 11] = 1
= − 1 × 11 × 1
= − 11