Beryllium, a member of alkaline earth metal, is almost as hard as:
Correct answer: C. iron
- A. calcium
- B. Potassium
- C. iron
- D. magnesium
Explanation
The Mohs scale of mineral hardness is used to compare the scratch resistance of different minerals. Beryllium has a Mohs hardness of 5.5, making it relatively hard among metals. Iron, with a hardness of 4, is the closest in hardness to beryllium among the options provided. Calcium, potassium, and magnesium all have significantly lower hardness values, making them incorrect choices when comparing their hardness to beryllium.
This question appeared on the ETEA MDCAT 2011 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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