Which of these compounds does not produce a colour in a flame test, and produces an alkaline gas when warmed with sodium hydroxide solution?
Ca(OH)2
Mg(OH)2
NH4Cl
BeCl2
Did this page help you?
Which of these compounds does not produce a colour in a flame test, and produces an alkaline gas when warmed with sodium hydroxide solution?
Ca(OH)2
Mg(OH)2
NH4Cl
BeCl2
Did this page help you?
What is the ionic equation for the reaction between aqueous solutions of barium nitrate and sodium sulfate?
Na+ (aq) + N (aq) → NaNO3 (s)
2Ba+ (aq) + S (aq) → Ba2SO4 (s)
Na2+ (aq) + 2N (aq) → Na(NO3)2 (s)
Ba2+ (aq) + S (aq) → BaSO4 (s)
Did this page help you?
Data for some Group 1 and Group 2 cations are shown in the table.
Cation | Ionic radius / nm | Ionic charge |
W | 0.100 | +2 |
X | 0.138 | +1 |
Y | 0.113 | +2 |
Z | 0.149 | +1 |
Which cation would be expected to form the nitrate with the greatest thermal stability?
W
X
Y
Z
Did this page help you?
Magnesium nitrate decomposes on heating.
2Mg(NO3)2 → 2MgO + 4NO2 + O2
What is the total volume of gas formed at room temperature and pressure (r.t.p.) when 0.005 mol of magnesium nitrate decomposes completely?
[Molar volume of a gas at r.t.p. = 24 000 cm3 mol−1]
600 cm3
300 cm3
240 cm3
120 cm3
Did this page help you?