Question

Select the correct answer from A, B, C, D and E for each statement given below:
A: Ammonia B: Hydrogen chloride
C: Hydrogen D: Nitrogen dioxide
State the gaseous product formed, when -
1. An active metal reacts with dilute sulphuric acid,
2. A metallic nitrate undergoes thermal decomposition giving a coloured gas.
3.Two gases one of them neutral, combines by absorption of light energy.
4. An ammonium salt reacts with an alkali
5. An exothermic reaction takes place between ammonia and a neutral gas.

Answer 1

Answer and Explanation:

1) Hydrogen

$\blacksquare$ When an active metal reacts with dilute sulphuric acid it produces, hydrogen gas along with salt solution

$\blacksquare$ Presence of hydrogen can be tested by bringing a lighted matchstick near the test tube

$\blacksquare$ Hydrogen on meeting the matchstick will produce a 'POP' sound

$\blacksquare$ For example : Zn with H₂SO₄

$\boxed{Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2}$

2) Nitrogen dioxide and Oxygen

$\blacksquare$ Metal nitrates on decomposition generally produces metal oxide,

nitrogen dioxide (Brown coloured fumes) and oxygen gas

$\blacksquare$ For example : LiNO₃ decomposition

$\boxed{4LiNO_3 \overset{\Delta}{\longrightarrow} 2Li_2O + 4NO_2 + O_2}$

3) Hydrogen chloride

$\blacksquare$ 2 gases, Hydrogen and Chlorine, combines by the absorption of light energy to form hydrogen chloride

$\blacksquare$ The reaction is given by

$\boxed{H_2 + Cl_2 \overset{h\nu}{\longrightarrow} 2HCl}$

4) Ammonia gas

$\blacksquare$ Ammonium salt reacts with alkali to form salt, ammonia gas and water

$\blacksquare$ For example : NH₄Cl reacts with NaOH

$\boxed{NH_4Cl + NaOH \rightarrow NaCl + NH_3 + 4H_2O}$

5) Nitric Oxide (NO)

$\blacksquare$ Exothermic reaction between ammonia and neutral gas produces oxygen gas

Answer 2

Answer:

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