Chemistry
When an ammonium salt is warmed with sodium hydroxide solution, ammonia gas is evolved. State three ways in which you could identify this gas.
Practical Chemistry
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Answer
The three ways to identify ammonia gas are:
- Ammonia gas turns moist red litmus turns blue.
- If a glass rod dipped in concentrated HCl is brought near the gas, dense white fumes of ammonium chloride are formed.
- The gas turns colourless Nessler's reagent i.e. K2HgI4 potassium mercuric iodide brown.
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Related Questions
State giving reasons if:
(a) zinc and aluminium can be distinguished by heating the metal powder with concentrated sodium hydroxide solution.
(b) calcium nitrate and lead nitrate can be distinguished by adding ammonium hydroxide solution to the salt solution.
Identify the substance 'R' based on the information given below :
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Question 2
Give a chemical test to distinguish between :
(a) Sodium chloride soln. and sodium nitrate soln.
(b) Hydrogen chloride gas and hydrogen sulphide gas.
(c) Calcium nitrate soln. and zinc nitrate soln.
(d) Carbon dioxide gas and sulphur dioxide gas.
(e) Sodium carbonate and sodium sulphite
(f) Ferrous nitrate and lead nitrate.
(g) Manganese dioxide and copper (Il) oxide.
(h) Sodium nitrate and sodium sulphite [using dilute sulphuric acid].
(i) Sodium chloride and sodium sulphide
(j) Sodium hydroxide solution and ammonium hydroxide solution.
(k) Ammonium sulphate and sodium sulphate.
(l) Sulphuric acid from nitric acid and hydrochloric acid.
(m) Magnesium chloride and magnesium nitrate solution
(n) Zinc sulphate solution and zinc chloride solution
(o) Iron (II) chloride soln. and iron (III) chloride soln.
(p) Calcium nitrate soln. and calcium chloride soln.