MCQ
An element $'X\ '$ reacts with $\mathrm{O}_2$ to give a compound with a high melting point. This compound is also soluble in water. The element $'X\ '$ is likely to be :
- ✓Iron.
- BCalcium
- CCarbon.
- DSilicon.
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Bacteria
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Fungi
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Viruses
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(a)
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no
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yes
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yes
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(b)
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yes
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no
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yes
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(c)
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yes
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yes
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no
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(d)
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yes
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yes
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yes
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