49. NCERT Exemplar: Short answer questions X

Exercise condition:

3 m.

When a metal ‘X’ is treated with cold water, It gives base salt ‘X’ with molecular formula \(XOH\) (Molecular mass = \(40\) and liberate a gas Z which easily catches fire. Identify X, Y and Z and also write the reaction involved.

X is

calcium (\(Ca\))
sodium (\(Na\))
magnesium (\(Mg\))

Y is

sodium hydroxide (\(NaOH\))
calcium hydroxide (\(Ca(OH)_2\)
magnesium hydroxide (\(MgOH\))
calcium hydroxide (\(Ca(OH)\)

Z is

\(H_2\) gas
\(O_2\) gas
\(H_2O\)
\(CO_2\) gas

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