The oxidation state of chlorine in HClO4 is
-5
-1
+1
+7
Correct answer is D
No explanation has been provided for this answer.
What volume of 0.5 mol dm-3 H2SO4 will exactly neutralize 20cm3 of 0.1 mol dm-3 NaOH solution?
2.0 cm3
5.0 cm3
6.8 cm3
8.3 cm3
Correct answer is A
2NaOH + H2SO4 → Na2SO4 + 2H2O
CaVa/CbVb = ratio of acid/ratio of base
(0.5 * Va)/(0.1 * 20) = 1/2
∴ Va = 2.0cm
Which of the following compound is a normal salt?
NaHS
NaHSO4
NaHCO3
Na2CO3
Correct answer is D
No explanation has been provided for this answer.
Calcium tetraoxosulphate (VI) dissolves in water only sparingly to form a
solution
suspension
precipitate
colloid
Correct answer is C
No explanation has been provided for this answer.
0.13
0.25
1.25
2.00
Correct answer is C
Relative molecular mass of CuSO4 = 64 + 32 + 16 * 4 = 160
The number of moles of CUSO4 = reacting mass/molecular mass = 20/160 = 0.125
100g of water dissolved 0.125m of CuSO4
100g of water will dissolve (0.125 * 1000)/100 = 1.25mol dm3