6(iii)
Rohan has two test tubes, A containing sodium chloride and B containing ammonium chloride as shown in the diagram below. He adds sodium hydroxide solution to both the test tubes and warms them gently.
Answer the following questions:
(a) In which test tube (A or B) will Rohan observe the evolution of a gas?
(b) Name the gas that is evolved.
(c) What will be the colour of the flame when this gas burns in oxygen?
(d) Write an equation for the reaction that occurs in the test tube in which the gas has evolved.
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(a) The gas is evolved in test tube B (containing ammonium chloride).
(b) The gas evolved is ammonia (NH3).
(c) Ammonia burns in oxygen with a greenish-yellow flame.
(d) NH4Cl + NaOH ⟶ NaCl + NH3 + H2O