Question : Which of the following elements has variable valency?
Option 1: Iron
Option 2: Sodium
Option 3: Sulphur
Option 4: Magnesium
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Correct Answer: Iron
Solution : The correct option is Iron.
Elements with variable valency are typically found in transition metals and some non-metals. Iron is a chemical element with the symbol Fe and atomic number 26. Iron is a silvery-grey, lustrous metal with a high melting point. It is known for its magnetic properties. Iron is the fourth most abundant element in the Earth's crust.
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Question : Pregnant women usually become deficient in
Option 1: Sodium and Calcium
Option 2: Iron and Sodium
Option 3: Calcium and Iron
Option 4: Magnesium and Iron
Question : Anaemia is caused by the deficiency of which of the following?
Option 1: Cobalt
Option 2: Iron
Option 3: Sodium
Option 4: Calcium
Question : Which of the following is used in photography?
Option 1: Sodium bicarbonate
Option 2: Sodium thiosulphate
Option 3: Sodium hydroxide
Option 4: Sodium sulphate
Question : Which of the following is the most abundant metal on Earth's crust?
Option 1: Magnesium
Option 3: Copper
Option 4: Aluminium
Question : What is" milk of magnesia chemically
Option 1: Magnesium carbonate
Option 2: Sodium bicarbonate
Option 3: Calcium hydroxide
Option 4: Magnesium hydroxide
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