Advertisements
Advertisements
प्रश्न
What happens when calcium reacts with water? Write the chemical equation of the reaction of calcium with eater.
उत्तर
When calcium reacts with water, it forms calcium hydroxide and hydrogen gas. Due to the formation of hydrogen bubbles that stick to the surface of calcium, it starts floating on water.
Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g)
APPEARS IN
संबंधित प्रश्न
A solution of CuSO4 in water is .................... in colour.
(a) Pink
(b) Blue
(c) Colourless
(d) Green
From amongst the metals sodium, calcium aluminium, copper and magnesium, name the metal:
(i) which reacts with water only on boiling, and
(ii) another which does not react even with steam.
Which of the following elements would yield a neutral oxide?
Na, S, C, K, H
What type of oxides are formed when non-metals react with oxygen? Explain with an example.
Arrange the following metals in order of their chemical reactivity, placing the most reactive metal first:
Magnesium, Copper, Iron, Sodium, Zinc, Lead, Calcium.
Give one example, with equation, of the displacement of hydrogen by a metal from an acid.
What happens when a metal reacts with dilute hydrochloric acid? Explain with the help of an example.
Zinc oxide is a metal oxide. Which of the following term best describes the nature of zinc oxide:
(a) an acidic oxide
(b) a basic oxide
(c) an amphoteric oxide
(d) a neutral oxide
Write the name and formula of a molecule made up of three atoms of oxygen.
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
