Advertisements
Advertisements
प्रश्न
Magnesium and oxygen combine in the ratio of 3 : 2 by mass to form magnesium oxide. What mass of oxygen gas would be required to react completely with 24 g of magnesium ?
Advertisements
उत्तर
Magnesium reacts with oxygen in the ratio of 3:2 to form magnesium oxide.
The above relation states that magnesium and oxygen combine in a fixed ratio of 3:2 by mass.
Therefore, 3g of magnesium react with 2g of oxygen to form magnesium oxide.
1g of magnesium requires = 2/3g of oxygen = 0.66g of oxygen
24g of magnesium require = 24 × 0.66g of oxygen = 16g
16g of oxygen would be required to react completely with 24g of magnesium.
APPEARS IN
संबंधित प्रश्न
The valency of calcium is 2. Write the valencies of other radical in the following :
- CaO
- Ca(OH)2
- CaC03
- CaCl2
Write the names of `"ZnCl"_2 ` compounds :
State whether the following statements are true or false:
A sodium ion has positive charge because it has more protons than a neutral atom.
State whether the following statements are true or false :
A chloride ion has negative charge because it has more electrons than a neutral atom.
An element X has a valency of 2. Write the simplest formula for bromide of the element.
The valencies (or charges) of some of the ions are given below :
| Ion | Valency (Charge) | Ion | Valency (Charge) |
| Sodium ion | 1+ | Bromide ion | 1– |
| Ammonium ion | 1+ | Hydroxide ion | 1– |
| Calcium ion | 2+ | Sulphate ion | 2– |
| Lead ion | 2+ | Phosphate ion | 3– |
Using this information, write down the formulae of the following compounds :
(i) Sodium phosphate
(ii) Ammonium sulphate
(iii) Calcium hydroxide
(iv) Lead bromide
Give example.
Basic radicals
Give example.
Bivalent acidic radicals
Complete the following table.
|
Acid Radicals `→` |
Chloride |
Nitrate |
Sulphate |
Carbonate |
Hydroxide |
Phosphate |
|
Basic Radicals `↓` |
||||||
|
Magnesium |
MgCl2 |
Mg(NO3)2 |
MgSO4 |
MgCO3 |
Mg(OH)2 |
Mg3(PO4)2 |
|
Sodium |
|
|
|
|
|
|
|
Zinc |
|
|
|
|
|
|
|
Silver |
|
|
|
|
|
|
|
Ammonium |
|
|
|
|
|
|
|
Calcium |
|
|
|
|
|
|
|
Iron (II) |
|
|
|
|
|
|
|
Potassium |
|
|
|
|
|
|
Match the radicals in List I with their correct names from List II.
| List I | List II | |
| 1. `"NO"_3^(1-)` | A: Bisulphite | F: Sulphate |
| 2. `"HSO"_4^(1-)` | B: Phosphate | G: Nitrate |
| 3. `"SO"_4^(2-)` | C: Carbonate | H: Phosphite |
| 4. `"PO"_4^(3-)` | D: Nitrite | I: Sulpite |
| 5. `"HCO"_3^(1-)` | E: Bicarbonate | J: Bisulphate |
