Question : Which of the following metals reacts violently with cold water?
Option 1: Magnesium
Option 2: Aluminium
Option 3: Zinc
Option 4: Potassium
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Correct Answer: Potassium
Solution : The correct option is potassium.
Potassium (K) reacts violently with cold water. When potassium comes into contact with water, it undergoes a highly exothermic reaction, producing hydrogen gas and forming a solution of potassium hydroxide. This reaction is more pronounced with alkali metals like potassium compared to alkaline earth metals like magnesium (Mg).
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Question : Which of the following metals is always a component in an amalgam?
Option 1: Strontium
Option 2: Mercury
Option 4: Aluminium
Question : Which of the following elements is used in the manufacture of fertilisers?
Option 1: Fluorine
Option 2: Potassium
Option 3: Lead
Question : Which of the following metals occurs in a free state?
Option 1: Copper
Option 2: Iron
Option 4: Lead
Question : The mineral constituent of chlorophyll is
Option 1: Iron
Option 2: Magnesium
Option 3: Calcium
Question : Which of the following is arranged in order of decreasing conductivity?
Option 1: Copper, aluminium, steel, silver
Option 2: Aluminium, silver, copper, steel
Option 3: Copper, silver, aluminium, steel
Option 4: Silver, copper, aluminium, steel
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