Chemistry

______ Is a process to obtain a very pure form of a solid dissolved in a liquid

In Chromatography the filter paper is

• Mobile phase

• Mixer

• Stationary phase

• None of the above

True /false, a black Residue is formed when sugar is heated

This gas has a rotten egg smell

• Ammonia

• Hydrogen

• Hydrogen sulphide

• Oxygen

Is the hardest compound known to us

A metal with melting point less than 50 degree celsius is

• Gold

• Iron

• Aluminium

• Gallium

A chemical called oxygenated water

Is the most abundant inert gas present in air

Chemical name of caustic soda is

Which of the following exhibits variable valency

• Calcium

• Copper

• Iron

• Both c and d