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प्रश्न
What is the nature of the oxide Na₂O? What happens when it is dissolved in water? Write the chemical equation of the reaction involved.
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उत्तर
Na2O is basic in nature. When it is dissolved in water, sodium hydroxide is formed.
Chemical equation: Na2O(s) + H2O(l) → 2NaOH(aq)
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संबंधित प्रश्न
Iron is
(a) More reactive than zinc
(b) More reactive than aluminium
(c) Less reactive than copper
(d) Less reactive than aluminium
Name the following:
Metals which forms an amphoteric oxide.
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.
Show the formation of Na2O by the transfer of electrons.
Food cans are coated with tin and not with zinc because ______.
Why are metals called electropositive elements?
From amongst the metals sodium, calcium, aluminium, copper and magnesium, name the metal:
- which reacts with water only on boiling, and
- another which does not react even with steam.
Complete and balance the following equation:
\[\ce{Cu(NO3)2_{(aq)} + Zn_{(s)} ->}\]
Arrange the following metals in order of their chemical reactivity, placing the most reactive metal first:
Magnesium, Copper, Iron, Sodium, Zinc, Lead, Calcium.
What happens when a rod of zinc metal is dipped into a solution of copper sulphate? Give chemical equation of the reaction involved.
Hydrogen is not a metal but still it has been assigned a place in the reactivity series of metals. Why?
Which non-metal has been placed in the reactivity series of metals?
One of the following is not a neutral oxide. This is:
(a) CO
(b) H2O
(c) N2O
(d) Na2O
An acidic oxide is produced by the element:
(a) Na
(b) C
(c) Ca
(d) H
Zinc oxide is a metal oxide. Which of the following term best describes the nature of zinc oxide:
(a) an acidic oxide
(b) a basic oxide
(c) an amphoteric oxide
(d) a neutral oxide
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
What are noble gases
What is the cause of chemical bonding (or chemical combination) of atoms of elements?
Calcium floats over water during the reaction with water. Give reason.
Which of the following property is not responsible for copper to be used as electrical conduction wires?
