nature of matter and composition - Category wise Question and Answer Practice Test with Solutions

Question : 31 [CDS]

Iodised salt is a

a) compound formed by combination of potassium iodide and common salt

b) mixture of potassium iodide and common salt

c) mixture of molecular iodide and common salt

d) compound formed by molecular iodine and common salt

Question : 32

The size of colloidal particles usually lies in the range

a) 10^–3 - 10^–5 cm

b) 10^–7 - 10^–9 cm

c) 10^–5 - 10^–7 cm

d) 10^–2 - 10^–6 cm

Question : 33 [CDS]

Iron sheet kept in moist air covered with rust. Rust is

a) a mixture of iron and dust

b) an element

c) a compound

d) a mixture of iron, oxygen and water

Question : 34

The chemical formula of Borax is

a) BaS$O_4$

b) $Na_2B_4O_7$

c) CaOC$l_2$

d) Ca$(SO_4)_2$

Question : 35

The main of component of Biogas is

a) Propane

b) Methane

c) Ethane

d) Butane