Advertisements
Advertisements
प्रश्न
Complete and balance the following equation:
Na + O2 →
Advertisements
उत्तर
4Na(s) + O2(g) → 2Na2O(s)
APPEARS IN
संबंधित प्रश्न
Write the chemical reaction when iron reacts with dilute H2SO4.
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes?
Name the metal which has been placed at the bottom of the reactivity series.
What will happen if a strip of copper is kept immersed in a solution of silver nitrate (AgNO3)?
Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.
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.
Which of the following elements would yield an acidic oxide.
Na, S, C, K, H
Which of the following elements would yield a basic oxide.
Na, S, C, K, H
How do metals react with hydrogen? Explain with an example.
Name another metal oxide which behaves like aluminium oxide.
The least reactive metal among the following is:
(a) sodium
(b) silver
(c) copper
(d) lead
The elements whose oxides can turn litmus solution blue are:
(a) carbon and sulphur
(b) sodium and carbon
(c) potassium and magnesium
(d) magnesium and sulphur
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 is soft and can be cut with a knife. If is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
(a) Mg
(b) S
(c) P
(d) Na
In a solution of lead acetate, a strip of metal M was dipped. After some time, lead from the solution was deposited on the metal strip. Which metal is more reactive, M or lead?
Which of the following reactions will not occur? Why not?
(a) MgSO4 (aq) + Cu (s) → CuSO4 (aq) + Mg (s)
(b) CuSO4 (aq) + Fe (s) → FeSO4 (aq) + Cu (s)
(c) MgSO4 (aq) + Fe (s) → FeSO4 (aq) + Mg (s)
Explain the following:
Reactivity of aluminium decrease if it is dipped in nitric acid.
The substance that will be flattened on beating with a hammer is ______.
Find the odd one out:
