Which of following is known as Blue Vitriol or Blue Stone?
Correct answer: B. CuSO4.5H2O
- A. AgNO3
- B. CuSO4.5H2O
- C. K2Cr2O7
- D. K2CrO4
Explanation
Blue vitriol or blue stone is hydrated copper(II) sulfate, CuSO4.5H2O, whose water of crystallisation gives it a bright blue colour. The likely mistake is choosing K2CrO4 or K2Cr2O7 because both are strongly coloured salts, but they are chromates rather than copper sulfate.
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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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