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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
‘E’ is an element which reacts with oxygen to form an oxide E2O. An aqueous solution of E2O turns red litmus blue, so:
i. What is the nature of oxide E2O ?
ii. Write the name of element ‘E’.
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.
The reaction of an iron nail with copper sulphate solution is ........... reaction.
(a) Combination
(b) Displacement
(c) Double displacement
(d) Decomposition
Why are metals called electropositive elements?
Write an equation for the reaction of:
Magnesium with oxygen
Give reasons for the following:
Blue colour of copper sulphate solution is destroyed when iron filings are added to it.
Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.
Complete and balance the following equation:
\[\ce{Na + O2 ->}\]
Complete and balance the following equation:
\[\ce{Cu(NO3)2_{(aq)} + Zn_{(s)} ->}\]
Calcium is a ______ reactive metal than sodium.
Which gas is produced when dilute hydrochloric acid is added to a reactive metal?
Name one metal more reactive than hydrogen.
Name one metal which displaces copper from copper sulphate solution.
Out of aluminium, copper, calcium and tin, the most reactive metal is:
A metal less reactive and another metal more reactive than hydrogen are ______.
Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
(i) Good thermal conductivity
(ii) Good electrical conductivity
(iii) Ductility
(iv) High melting point
Which one among the following is an acidic oxide?
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.
The substance that will be flattened on beating with a hammer is ______.
