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प्रश्न
A basic oxide will be formed by the element ______.
पर्याय
K
S
P
Kr
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उत्तर
A basic oxide will be formed by the element K.
Explanation:
Potassium (K) is an alkali metal, and metals characteristically react with oxygen to form basic oxides. When potassium oxide (K2O) dissolves in water, it produces a strong base called potassium hydroxide (KOH). Conversely, Sulphur (S) and Phosphorus (P) are non-metals that form acidic oxides, while krypton (Kr) is an unreactive noble gas.
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संबंधित प्रश्न
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.
Write the electron-dot structures for sodium, oxygen and magnesium.
Name the metal which has been placed at the bottom of the reactivity series.
Give reasons for the following:
Blue colour of copper sulphate solution is destroyed when iron filings are added to it.
Calcium is a ______ reactive metal than sodium.
With the help of examples, describe how metal oxides differ from non-metal oxides.
What type of oxides are formed when metals combine with oxygen? Explain with the help of an example.
What happens when calcium reacts with chlorine? Write an equation for the reaction which takes place.
Name two metals which cannot displace hydrogen from dilute acids.
Why is white phosphorus kept immersed under water?
Write the equation for the reaction of:
Iron with dilute hydrochloric acid.
Name the products formed in the given case. Also indicate the physical states of all the substances involved.
The least reactive metal among the following is:
(a) sodium
(b) silver
(c) copper
(d) lead
Metal A burns in air, on heating, to form an oxide A2O3 whereas another metal B burns in air only on strong heating to form an oxide BO. The two oxides A2O3 and BO can react with hydrochloric acid as well as sodium hydroxide solution to form the corresponding salts and water.
(a) What is the nature of oxide A2O3?
(b) What is the nature of oxide BO?
(c) Name one metal like A.
(b) Name one metal like B.
Write the name and formula of a molecule made up of three atoms of oxygen.
Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin?
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.
An alkali metal A gives a compound B (molecular mass = 40) on reacting with water. The compound B gives a soluble compound C on treatment with aluminium oxide. Identify A, B and C and give the reaction involved.
Which of the following property is not responsible for copper to be used as electrical conduction wires?
Why is acidified water considered to be a good conductor of electricity?
