Predict the decomposition product which will give brown colored gas
Correct answer: C. Mg(NO3)2
- A. Na2SO4
- B. BaCO3
- C. Mg(NO3)2
- D. CaSO4
Explanation
Alkaline earth metal nitrates, such as magnesium nitrate (Mg(NO3)2), calcium nitrate (Ca(NO2)2), and barium nitrate (Ba(NO3)2), decompose upon heating to form metal oxides, nitrogen oxides, and oxygen gas. In each case, the metal nitrate decomposes into the corresponding metal oxide, nitrogen dioxide gas (NO2), and oxygen gas (O2). The nitrogen dioxide gas gives off the brown colour.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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