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प्रश्न
Name two metals which cannot displace hydrogen from dilute acids.
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उत्तर
Copper and silver are two metals which cannot displace hydrogen from dilute acids.
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संबंधित प्रश्न
.................... liberated when acetic acid reacts with sodium metal.
(a) Hydrogen
(b) Chlorine
(c) Oxygen
(d) Nitrogen
Name the metal which has been placed just below copper in the reactivity series.
Complete and balance the following equation:
Na + O2 →
Fill in the following blank with suitable word:
Calcium is a ................. reactive metal than sodium.
Which of the following elements would yield a basic oxide.
Na, S, C, K, H
What happens when a rod of zinc metal is dipped into a solution of copper sulphate? Give chemical equation of the reaction involved.
Why is white phosphorus kept immersed under water?
Which gas is produced when dilute hydrochloric acid is added to a reactive metal?
Give one example, with equation, of the displacement of hydrogen by a metal from an acid.
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
The least reactive metal among the following is:
(a) sodium
(b) silver
(c) copper
(d) lead
Name a metal which It does not react with any physical state of water?
What are noble gases
Calcium floats over water during the reaction with water. Give reason.
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?
(i) Good thermal conductivity
(ii) Good electrical conductivity
(iii) Ductility
(iv) High melting point
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?
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.
Metals are generally solid. Which of the following metals is in the liquid state at room temperature?
Why is acidified water considered to be a good conductor of electricity?
