2H2O (l) + 2F2(g) → 4HF(aq) + O2(g).
In the reaction above, the substance that is being reduced is
O2(g)
H2O(l)
F2(g)
HF(aq)
Correct answer is C
F(2) + 2e \(\rightarrow\) 2F- x 2
2F2 + 4e \(\rightarrow\) 4F-
An insoluble salt can be prepared by
the reaction of trioxocarbonate (V) with an acid
double decomposition
the action of dilute acid on an insoluble base
the reaction of metals with an acid
Correct answer is B
No explanation has been provided for this answer.
Which of the following substances is not a salt?
Aluminium oxide
Sodium hydrogentrioxosulphate (V)
Sodium trioxocarbonate (V
Zinc chloride
Correct answer is A
No explanation has been provided for this answer.
close to that of pure water
less than 6.4
greater than 6.4
unaltered
Correct answer is B
No explanation has been provided for this answer.
0.4
8.0
2.0
0.5
Correct answer is A
C1V1 = C2V2
C2 = \(\frac{C_1V_1}{V_2}\)
= \(\frac{2.0 \times 2.5}{12.5}\)
= 0.4mol/dm-3