Which one of the following statements is true?
Correct answer: A. All nitrates of Group II metals are decomposed by heat to give the oxide NO2
- A. All nitrates of Group II metals are decomposed by heat to give the oxide NO2
- B. Aqueous sodium nitrate in acidic to litmus
- C. Aqueous ammonium nitrate is alkaline to litmus
- D. The alkali metal nitrates are insoluble in water
- E. Metals dissolve in concentrated nitric acid to give hydrogen
Explanation
All group II and group I metals decompose to produce NO2 as the gas, so statement A stands correct. Hydrogen gas is not evolved when a metal reacts with nitric acid, hence E is wrong. Aqueous sodium nitrate and ammonium nitrate both are almost neutral, so B and C are also wrong. Option D is wrong because all nitrates are soluble.
This question appeared on the NUMS 2016 paper, which you can sit online with every answer explained.
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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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