Advertisements
Advertisements
प्रश्न
Give one example, with equation, of the displacement of hydrogen by a metal from an acid.
Advertisements
उत्तर
Sodium displaces hydrogen from dilute hydrochloric acid.
2Na(s) + 2HCl(aq) → 2NaCl(aq) + H2(g)
APPEARS IN
संबंधित प्रश्न
Name the following:
Metals which forms an amphoteric oxide.
‘E’ is an element which reacts with oxygen to form an oxide E2O. An aqueous solution of E2O turns red litmus blue, so:
i. What is the nature of oxide E2O ?
ii. Write the name of element ‘E’.
Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.
Complete and balance the following equation:

With the help of examples, describe how metal oxides differ from non-metal oxides.
Which of the following elements would yield an acidic oxide.
Na, S, C, K, H
What happens when magnesium reacts with very dilute nitric acid? Write an equation for the reaction involved.
You are given samples of three metals − sodium, magnesium and copper. Suggest any two activities to arrange them in order of their decreasing reactivities.
Name one metal which displaces copper from copper sulphate solution and one which does not.
A basic oxide will be formed by the element:
(a) K
(b) S
(c) P
(d) Kr
The least reactive metal among the following is:
(a) sodium
(b) silver
(c) copper
(d) lead
An element X reacts with hydrogen, when heated, to form a covalent hydride H2X. If H2X has a smell of rotten eggs, the element X is likely to be:
(a) carbon
(b) sulphur
(c) chlorine
(d) phosphorus
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
An element E forms an oxide E2O. An aqueous solution of E2O turns red litmus paper blue.
(a) What is the nature of the oxide E2O?
(b) State whether element E is a metal or a non-metal.
(c) Give one example of an element like E.
In nature, metal A is found in a free state while metal B is found in the form of its compounds. Which of these two will be nearer to the top of the activity series of metals?
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.
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?
Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?
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.
