linear with +ve slope and non zero +ve intercept

linear with -ve slope and non zero +ve intercept

linear with -ve slope and zero intercept

linear with $+v e$ slope and zero intercept

Gelatin < haemoglobin < sodium acetate

Gelatin > haemoglobin > sodium acetate

Haemoglobin $>$ gelatin $>$ sodium acetate

Sodium acetate $>$ gelatin $>$ haemoglobin

Hematite

Magnetite

Calamine

Siderite

NO

$\mathrm{N}_2 \mathrm{O}$

$\mathrm{N}_2 \mathrm{O}_5$

$\mathrm{NO}_3$