X is the fifth most abundant metal in the Earth’s crust. It can be found in large areas of the ocean floor. These occurrences are called X - nodules. The amount of X in the nodules is estimated to be much more than that in land reserves. Which of the following are valid facts about X?

X is used in the manufacturing of bleaching powders.

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X improves corrosion resistance in magnesium alloys.

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X is used to smelt iron in furnaces.

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X has strength that is comparable to that of iron but is also super light and is known for its conductivity.

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Solution

The correct options are
A X is used in the manufacturing of bleaching powders.
B X improves corrosion resistance in magnesium alloys.
X is manganese. Manganese is the fifth most abundant metal in the Earth’s crust. It can be found in large areas of the ocean floor. These occurrences are called Manganese nodules. The amount of manganese in the nodules is estimated to be much more than that in land reserves. Manganese is known for its versatility, and is used in many alloys to make them stronger and more resistant to wear.

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(h) The non-metal present in steel is ...
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(k) The rocky material found with ores is called....

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