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प्रश्न
Which gas is produced when dilute hydrochloric acid is added to a reactive metal?
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उत्तर
Hydrogen gas is evolved when dilute hydrochloric acid is added to a reactive metal.
\[\ce{\underset{Zinc}{Zn_{(s)}} + \underset{acid}{\underset{Hydrochloric}{2HCl(dil.)}}-> \underset{Zinc chloride}{ZnCl2_{(aq)}} + \underset{Hydrogen}{H2_{(g)}}}\]
Iron and dilute H2SO4 react as follows:
\[\ce{Fe_{(s)} + H2SO4(dil.) -> FeSO4_{(aq)} + H2_{(g)}}\]
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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
Why is sodium kept immersed in kerosene oil?
Write equations for the reactions of iron with steam.
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
Complete and balance the following equation:
Na2O + H2O →
What happens when calcium reacts with water? Write the chemical equation of the reaction of calcium with water.
The elements whose oxides can turn phenolphthalein solution pink are:
(a) Na and K
(b) K and C
(c) Na and S
(d) K and P
One of the following is not a neutral oxide. This is:
(a) CO
(b) H2O
(c) N2O
(d) Na2O
Out of aluminium, copper, calcium and tin, the most reactive metal is:
(a) aluminium
(b) copper
(c) tin
(d) calcium
The least reactive metal among the following is:
(a) sodium
(b) silver
(c) copper
(d) lead
Which one of the following four metals would be displaced from the solution of its salt by the other three metals?
(a) Zn
(b) Ag
(c) Cu
(d) Mg
CuSO4(aq) + Fe(s) → FeSO4(aq) + Cu(s)
FeSO4(aq) + Zn(s) → ZnSO4(aq) + Fe(s)
On the basis of the above reactions, indicate which is most reactive and which is least reactive metal out of zinc, copper and iron.
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?
When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding sodium metal to water catches fire. Why is it so?
Choose the correct alternative and rewrite the following:
Which of the following is lue in colour?
Write the chemical equation of the above process.
Answer the following question:
An element X on reacting with oxygen forms an oxide X2O. This oxide dissolves in water and turns red litmus blue. State whether element X is metal or a non - metal. Explain with a proper example.
Write the chemical equation for the following reaction:
Calcium metal reacts with water.
Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
- Good thermal conductivity
- Good electrical conductivity
- Ductility
- High melting point
