CHEMISTRY [1 Mark Question Answer]

A mixture consists of sand and common salt. Briefly describe the experimental procedure for calculating the percentage of sand.

Identify the gases from the observations:
A colourless gas, which changes to steamy vapours on cooling. It forms colourless, tiny droplets of liquid which turn anhydrous copper sulphate blue and anhydrous cobalt chloride pink.

Identify the gases from the observations:
A colourless gas having a rotten eggs like smell. It turns limewater milky and moist lead acetate paper silvery black.

Identify the gases from the observations:
A reddish brown gas having a pungent smell. It tums moist potassium iodide paper brown.

Identify the gases from the observations:
A greenish yellow gas having a pungent and suffocating smell. It turns moist blue litmus paper red and then bleaches it.

Identify the gases from the observations:
A colourless gas having a suffocating smell. It turns limewater milky and potassium dichromate solution green.

Identify the gases from the observations:
A colourless and odourless gas, which is neutral towards litmus. It explodes with a ‘pop” sound when a burning wooden splint is held near it.

Identify the gases from the observations:
A colourless gas having a pungent and irritating smell, which turns blue litmus red. It gives dense white fumes when a glass rod dipped in ammonium hydroxide solution is held in it.

Identify the gases from the observations:
A colourless and odourless gas, which extinguishes a burning wooden splint. It ums limewater milky. but has no action with potassium permanganate.

Identify the gases from the observations:
A colourless gas which fumes strongly in air and has a sharp smell. It gives dense white fumes with a glass rod dipped in conc. HCl.

Identify the gases from the observations:
A colourless and odourless gas which is neutral towards litmus and relights glowing wooden splint.