Which of the following is not considered hard | vedclass

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(B) Hard water is defined as water that contains dissolved salts of calcium $(Ca^{2+})$ and magnesium $(Mg^{2+})$,typically in the form of chlorides,s

Vedclass · Accepted Answer

Water containing dilute $HCl$

Vedclass · Answer

(B) Hard water is defined as water that contains dissolved salts of calcium $(Ca^{2+})$ and magnesium $(Mg^{2+})$,typically in the form of chlorides,sulfates,or bicarbonates.$A$ and $C$ contain $Ca^{2+}$ and $Mg^{2+}$ ions,respectively,which contribute to water hardness.$B$ contains dilute $HCl$,which provides $H^{+}$ ions. While acidic water can be corrosive,it is not classified as 'hard water' because hardness is specifically defined by the presence of calcium and magnesium ions.Therefore,water containing dilute $HCl$ is not hard water.

$1.$ Heavy water	$a.$ Bicarbonates of $Mg$ and $Ca$ in water
$2.$ Temporary hard water	$b.$ No foreign ions in water
$3.$ Soft water	$c.$ $D_2O$
$4.$ Permanent hard water	$d.$ Sulphates and chlorides of $Mg$ and $Ca$ in water

Which of the following is not considered hard water?

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