Advertisements
Advertisements
प्रश्न
The metals which can produce amphoteric oxides are:
(a) sodium and aluminium
(b) zinc and potassium
(c) calcium and sodium
(d) aluminium and zinc
Advertisements
उत्तर
(d) aluminium and zinc
Both aluminium and zinc oxides react with acids and bases to form salt and water.
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.
What would you observe when zinc is added to a solution of iron (II) sulphate? Write the chemical reaction that takes place.
A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.
In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.
A solution of _________________ in water is green in colour.
(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3
Why are metals called electropositive elements whereas non-metals are called electronegative elements?
Name the metal which has been placed at the top of the reactivity series.
How would you show that silver is chemically less reactive than copper?
Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid.
Name two metals which cannot displace hydrogen from dilute acids.
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 E reacts with water to form a solution which turns phenolphthalein solution pink. The element E is most likely to be:
(a) S
(b) Ca
(c) C
(d) Ag
In nature, metal A is found in a free state while metal B is found in the form of its compounds. Which of these two will be nearer to the top of the activity series of metals?
If A, B, C, D, E, F, G, H, I, J and K represent metals in the decreasing order of their reactivity, which one of them is most likely to occur in a free state in nature?
Name a metal which does not react with cold as well as hot water but reacts with steam.
Choose the correct alternative and rewrite the following:
Which of the following is lue in colour?
Calcium floats over water during the reaction with water. Give reason.
Rewrite the following statement by selecting the correct option.
A solution of Al2(SO4)3 in water is _____________.
Write the chemical equation for the following reaction:
Cinnabar is heated in the presence of air.
Why is acidified water considered to be a good conductor of electricity?
