Advertisements
Advertisements
प्रश्न
Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?
पर्याय
Iron
Sodium
Gold
Magnesium
Advertisements
उत्तर
Sodium
Explanation:
Metals are generally hard. This means that most of the metals cannot be cut easily. But sodium metal is soft and can be easily cut with a knife.
APPEARS IN
संबंधित प्रश्न
Write the electron-dot structures for sodium, oxygen and magnesium.
Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.
Write the chemical equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced is ignited with a burning matchstick?
One of the following is not a neutral oxide. This is:
(a) CO
(b) H2O
(c) N2O
(d) Na2O
An acidic oxide is produced by the element:
(a) Na
(b) C
(c) Ca
(d) H
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
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.
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)
Write the name and formula of a molecule made up of three atoms of oxygen.
Explain the following:
Reactivity of aluminium decrease if it is dipped in nitric acid.
