Advertisements
Advertisements
प्रश्न
What is the nature of the oxide Na2O? What happens when it is dissolved in water? Write the chemical equation of the reaction involved.
Advertisements
उत्तर
Na2O is basic in nature. When it is dissolved in water, sodium hydroxide is formed.
Chemical equation: Na2O(s) + H2O(l) → 2NaOH(aq)
APPEARS IN
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.
Show the formation of Na2O by the transfer of electrons.
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
Write equation for the reaction of magnesium with oxygen.
What will happen if a strip of copper is kept immersed in a solution of silver nitrate (AgNO3)?
Fill in the following blank with suitable word:
Ordinary aluminium strips are not attacked by water because of the presence of a layer of ................. on the surface of aluminium.
What type of oxides are formed when non-metals react with oxygen? Explain with an example.
Name two metals which cannot displace hydrogen from dilute acids.
An acidic oxide is produced by the element:
(a) Na
(b) C
(c) Ca
(d) H
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.
What is the characteristic of the electronic configuration of noble gases?
Write the name and formula of a molecule made up of three atoms of oxygen.
Choose the correct alternative and rewrite the following:
Reaction of iron nails whith copper sulphate solution is an example of _____________________
Rewrite the following statement by selecting the correct option.
A solution of Al2(SO4)3 in water is _____________.
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.
Where does the metal aluminium, used in the thermit process, occurs in the reactivity series of metals?
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?
The substance that will be flattened on beating with a hammer is ______.
Which of the following property is not responsible for copper to be used as electrical conduction wires?
