Question

part i qualitative tests

1. colors of the following gases:

nitrogen dioxide____________________ nitric oxide_______________________
chlorine____________________________ hydrogen chloride__________________
hydrogen____________________________ oxygen____________________________
ammonia______________________________

1. solubility of the following gases:

nitrogen dioxide____________________ oxygen____________________________
hydrogen chloride______________________

1. glowing splint test

oxygen______________________________ hydrogen___________________________
hydrogen chloride____________________ ammonia___________________________
nitric oxide___________________________

1. dye strip test

ammonia______________________________ hydrogen chloride _________________

1. when hydrogen chloride and ammonia are mixed together,

________________________________________________________________________

Explanation:

1. For gas colors: Based on standard chemical properties of each gas.
2. For gas solubility: Based on standard aqueous solubility behavior of each gas.
3. For glowing splint test: Based on reactivity/combustion properties of each gas.
4. For dye strip test: Based on acidic/basic nature of the gases.
5. For mixed HCl and ammonia: Based on their acid-base reaction product.

Answer:

1. Colors of the following gases:

Nitrogen dioxide: Reddish-brown
Nitric oxide: Colorless
Chlorine: Pale greenish-yellow
Hydrogen chloride: Colorless
Hydrogen: Colorless
Oxygen: Colorless
Ammonia: Colorless

1. Solubility of the following gases:

Nitrogen dioxide: Highly soluble (reacts with water)
Oxygen: Slightly soluble
Hydrogen chloride: Extremely soluble

1. Glowing splint test:

Oxygen: Relights the glowing splint
Hydrogen: Ignites with a pop sound
Hydrogen chloride: No reaction (splint goes out)
Ammonia: No reaction (splint goes out)
Nitric oxide: No reaction (splint goes out)

1. Dye strip test:

Ammonia: Turns moist red litmus paper blue
Hydrogen chloride: Turns moist blue litmus paper red

1. When hydrogen chloride and ammonia are mixed together:

A dense white smoke of ammonium chloride ($\text{NH}_4\text{Cl}$) is formed.