An element X reacts with excess of oxygen to form an oxide which
dissolves in water to forin a solution that turns blue litmus red. The
oxide of X dissolves in NaOH to form salt and water. The element
X is :
(A) Carbon
(B) Calcium
(C) Sodium
(D) Potassium
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Answer:
Carbon
Explanation:
• Oxide turn blue litmus into red. Hence
it must be an acidic oxide. We know the oxides of non-metals are acidic in nature. • The oxide also reacts with sodium hydroxide to form salt.
From the first point itself, we can conclude that the element in question is carbon.
The reaction of carbon with oxygen to form its oxide (carbon di oxide) is given by:
C+02=) CO2
Reaction of CO2 with NaOH to form salt is given by:
CO2 + NaOH =) NaHCO,
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