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प्रश्न
Which of the following elements would yield an acidic oxide.
Na, S, C, K, H
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उत्तर
S and C would yield acidic oxides.
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संबंधित प्रश्न
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.
The reaction of an iron nail with copper sulphate solution is ........... reaction.
(a) Combination
(b) Displacement
(c) Double displacement
(d) Decomposition
Explain the following reaction with the help of a balanced chemical equation:
Magnesium reacts with hot water.
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.
Which of the following elements would yield a neutral oxide?
Na, S, C, K, H
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 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
Hydrogen is not a metal but still it has been assigned a place in the reactivity series of metals. Why?
A basic oxide will be formed by the element:
(a) K
(b) S
(c) P
(d) Kr
Out of aluminium, copper, calcium and tin, the most reactive metal is:
(a) aluminium
(b) copper
(c) tin
(d) calcium
The elements whose oxides can turn litmus solution red are:
(a) lithium and sodium
(b) copper and potassium
(c) carbon and hydrogen
(d) phosphorus and sulphur
An element E forms an oxide E2O. An aqueous solution of E2O turns red litmus paper blue.
(a) What is the nature of the oxide E2O?
(b) State whether element E is a metal or a non-metal.
(c) Give one example of an element like E.
State and explain the reaction, if any, of the following metals with a solution of copper sulphate:
(a) Gold
(b) Copper
(c) Zinc
(d) Mercury
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?
Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?
