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Molecules

How Calcium o...

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How Calcium or Magnesium can displace Sodium or Potassium from carboxylic ion in hard water even they are less reactive than sodium and potassium?

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The figure represents the reactivity of metals then which of the following are correct?

(i) Sodium is more reactive than magnesium.

(ii) Magnesium ad aluminium metals displace lead.

(iii) Magnesium and aluminium metals displace calcium.

(iv) Iron and tin metals can displace magnesium.

(v) Most reactive metal is sodium.

(vi) Gold is least reactive.

(vii) Calcium and zinc metals displace iron.

Q. Assertion :Sodium and potassium carbonates are soluble in water but magnesium and calcium carbonates are insoluble in water. Reason: Lattice energy of Mg and Ca carbonates is much higher than sodium and potassium carbonate.

Q. ___ is used as the reducing agent to extract highly reactive metals like sodium, potassium and calcium from their ores.

Q. Explain why is sodium less reactive than potassium.

Q. Which sequence indicates correctly the increasing reactivity of metals?
(a) iron, zinc, magnesium, sodium, potassium
(b) sodium, potassium, magnesium, zinc, iron
(c) magnesium, potassium, sodium, iron, zinc
(d) iron, zinc, sodium, magnesium, potassium

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