In Bredig's arc method,some alkali is added because:

Point out the false statement.

Gold number of a lyophilic sol is such a property that:

$A$ micelle formed during the cleansing action by soap is

Match List-$I$ with List-$II$:

$A$. Aerosol	$I$. Milk
$B$. Foam	$II$. Soap lather
$C$. Emulsion	$III$. Cheese
$D$. Gel	$IV$. Smoke

$A$ $10^{-3} \ M$ solution of detergent $(C_{12}H_{25}SO_4^-Na^+)$ forms a colloidal sol. In $1 \ mm^3$ of the solution,there are on average $10^{13}$ colloidal particles. How many ions are present in one colloidal particle (micelle)? $(N_A = 6 \times 10^{23})$