Advertisements
Advertisements
प्रश्न
Complete and balance the following equation:
\[\ce{Na + O2 ->}\]
Advertisements
उत्तर
\[\ce{4Na_{(s)} + O2_{(g)} -> 2Na2O_{(s)}}\]
APPEARS IN
संबंधित प्रश्न
A solution of CuSO4 in water is .................... in colour.
(a) Pink
(b) Blue
(c) Colourless
(d) Green
Write equations for the reactions of calcium and potassium with water.
Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows.
| Metal | Iron (II) sulphate | Cooper (II) sulphate | Zinc sulphate | Silver nitrate |
| A | No reaction | Displacement | ||
| B | Displacement | No reaction | ||
| C | No reaction | No reaction | No reaction | Displacement |
| D | No reaction | No reaction | No reaction | No reaction |
Use the Table above to answer the following questions about metals A, B, C and D.
- Which is the most reactive metal?
- What would you observe if B is added to a solution of copper (II) sulphate?
- Arrange the metals A, B, C and D in the order of decreasing reactivity.
What would you observe when zinc is added to a solution of iron (II) sulphate? Write the chemical reaction that takes place.
Explain the following reaction with the help of a balanced chemical equation:
Magnesium reacts with hot water.
What name is given to those metal oxides which show basic as well as acidic behaviour?
Name the metal which has been placed at the bottom of the reactivity series.
Name the metal which has been placed at the top of the reactivity series.
Write an equation for the reaction of:
Magnesium with oxygen
Complete and balance the following equation:
\[\ce{Na2O + H2O ->}\]
Magnesium liberates ______ gas on reacting with hot boiling water.
What type of oxides are formed when metals combine with oxygen? Explain with the help of an example.
How do metals react with hydrogen? Explain with an example.
Hydrogen is not a metal but still it has been assigned a place in the reactivity series of metals. Why?
Metal A burns in air, on heating, to form an oxide A2O3 whereas another metal B burns in air only on strong heating to form an oxide BO. The two oxides A2O3 and BO can react with hydrochloric acid as well as sodium hydroxide solution to form the corresponding salts and water.
- What is the nature of oxide A2O3?
- What is the nature of oxide BO?
- Name one metal like A.
- Name one metal like B.
Write the name and formula of a molecule made up of three atoms of oxygen.
Where does the metal aluminium, used in the thermit process, occurs in the reactivity series of metals?
Write the chemical equation for the following reaction:
Cinnabar is heated in the presence of air.
An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following.
Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?
