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प्रश्न
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?
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उत्तर
The metal K is most likely to occur in a free state in nature because it is the least reactive among other metals. Since it is the least reactive, it will not react with other elements. In a reactivity series, metals are arranged in decreasing order. Since K is placed at the very end of the series, it is the least reactive metal. Because it has very low chemical reactivity, it does not easily react with oxygen, moisture, or acids in the air to form compounds, allowing it to remain in its pure, elemental form.
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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 an equation for the reaction of:
Sodium with oxygen
What is the nature of the oxide Na2O? What happens when it is dissolved in water? Write the chemical equation of the reaction involved.
Name two metals which cannot displace hydrogen from dilute acids.
Which gas is produced when dilute hydrochloric acid is added to a reactive metal?
What special name is given to substances like aluminium oxide?
What happens when a metal reacts with dilute hydrochloric acid? Explain with the help of an example.
One of the following is not a neutral oxide. This is:
The metals which can produce amphoteric oxides are ______.
The elements whose oxides can turn litmus solution blue are ______.
Zinc oxide is a metal oxide. Which of the following term best describes the nature of zinc oxide:
A metal less reactive and another metal more reactive than hydrogen are ______.
An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be ______.
Which of the following pair of reactants can undergo a displacement reaction under appropriate conditions?
Calcium floats over water during the reaction with water. Give reason.
Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin?
A cable manufacturing unit tested few elements on the basisof their physical properties.
| Properties | W | X | Y | Z |
| Malleable | Yes | No | No | Yes |
| Ductile | Yes | No | No | Yes |
| Electrical conductivity | Yes | Yes | Yes | No |
| Melting Point | High | Low | Low | High |
Which of the above elements were dicarded for usage by the company?
Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?
Find the odd one out:
