A salt 'X' on heating liberates one coloured gas and another colourless gas. Both the gases are paramagnetic. The salt 'X' may be:
Correct answer: D. LiNO3
- A. NaNO3
- B. KNO3
- C. Na2CO3
- D. LiNO3
Explanation
Upon heating, LiNO3 decomposes as follows: 4LiNO3 → 2Li2O + 4NO2 + O2. The decomposition releases nitrogen dioxide (NO2), a coloured gas, and oxygen (O2), a colourless gas. Both gases are paramagnetic, which aligns with the given condition in the question.Comparatively, NaNO3 and KNO3 release O2 but do not release any coloured paramagnetic gas, and Na2CO3 releases CO2, which is not paramagnetic.
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The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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