An element, X, forms a volatile hydride XH3 with a v...
An element, X, forms a volatile hydride XH3 with a vapour density of 17.0. The relative atomic mass of X is?
(H = 1)
34.0
31.0
20.0
14.0
Correct answer is B
Molecular Mass = Vapour density x 2 = 17.0 x 2 = 34.0
∴ Relative Atomic Mass of X in XH3 = 34 - 3
= 31.0 ∴ x = 31.0
The aqueous solution which has pH > 7 is ...
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) From the equation above, calculate the mass of sodium hyd...
In which of the following pairs are both substances deliquescent? ...
Sodium metal is always kept under oil because it ...
Which compound is a component of baking powder? ...
How many structural isomers can be written for the alkyl bromide, C4H9Br?...
On exposure to hydrogen sulphide, moist lead (II) ethanoate paper turns ...
Metals can be extracted from their ores by a process involving ...