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Ignition temperature of potassium is (I)_. To prevent its (ii)_ combustion, it is stored under (iii) _. The information in which alternative completes the given statements?

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Answer:

The ignition temperature of potassium is **low**. To prevent its **spontaneous** combustion, it is stored under **mineral oil**.

So, the complete statements would be:

The ignition temperature of potassium is (i) **low**. To prevent its (ii) **spontaneous** combustion, it is stored under (iii) **mineral oil**.

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