The oxidation state of sulphur on H2SO4 acid is
-4
+6
4
-8
Correct answer is B
In SO4. The state of oxygen oxidation number is -2. Options A,C,D do not belong to the oxidation state in SO4
S block elements of the periodic table one made up of
groups 1, 2, 3
groups 1, and 2
group 3
group 3 to 7
Correct answer is B
S block elements only are made up of group 1 and 2 options A,C,D takes place of the other blocks in the periodic table p,d,f etc.
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.