Advertisements
Advertisements
प्रश्न
Fill in the following blank with suitable word:
Calcium is a ................. reactive metal than sodium.
Advertisements
उत्तर
Calcium is a less reactive metal than sodium.
APPEARS IN
संबंधित प्रश्न
Why is sodium kept immersed in kerosene oil?
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.
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:
A solution of _________________ in water is green in colour.
(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3
State whether the following statement is true or false:
Non-metals react with dilute acids to produce a gas which burns with a 'pop' sound.
Write equation for the reaction of sodium with oxygen.
Complete and balance the following equation:
Cu (NO3)2 (aq) + Zn(s) →
Why is white phosphorus kept immersed under water?
Give one example, with equation, of the displacement of hydrogen by a metal from an acid.
What is the action of water on aluminium ? Write equation of the chemical reaction involved.
What happens when calcium reacts with water? Write the chemical equation of the reaction of calcium with eater.
What is meant by the reactivity series of metals? Arrange the following metals in an increasing order of their reactivities towards water:
Zinc, Iron, Magnesium, Sodium
An element X reacts with hydrogen, when heated, to form a covalent hydride H2X. If H2X has a smell of rotten eggs, the element X is likely to be:
(a) carbon
(b) sulphur
(c) chlorine
(d) phosphorus
An element X forms two oxides XO and XO2. The oxide XO has no action on litmus solution but oxide XO2 turns litmus solution red.
(a) What is the nature of oxide XO?
(b) What is the nature of oxide XO2?
(c) Would you call element X a metal or a non-metal? Give reason for your choice.
(d) Can you give an example of element like X?
Write a chemical equation to illustrate the use of aluminium for joining cracked railway lines.
Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?
Find the odd one out:
Why is acidified water considered to be a good conductor of electricity?
