Question

16. What type of chemical reactions take place when :
(a) a magnesium wire is burnt in air ?
(b) lime-stone is heated ?
(c) silver bromide is exposed to sunlight ?
(d) electricity is passed through water?
(e) ammonia and hydrogen chloride are mixed ?​

Answer 1

Explanation:

a- combination reaction.

b. exothermic reaction

c.photochemical decomposition.

d.electrical photo decomposition.

e.combination reaction.

Answer 2

Answer:

a)2Mg +O² = 2MgO( combination reaction)

b)Caco³ ......heat.....CaO + Co²(thermal decomposition reaction)

c) Silver Bromide is exposed to light, it decomposes to silver metal and bromine vapours. 2AgBr (s) -------------------> 2Ag (s) + Br2 (g).

d) When electric current is passed through water , it decomposes to give hydrogen gas and oxygen gas.

ELECTRICITY

2H₂O(I) ---------------------------- > 2H₂(g) + O₂(g)

e) If you mix Ammonia as well as Hydrogen chloride, you will get ammonium chloride. It is given by NH3 (g) + HCl (g) → NH4Cl(s).