Question

True /False Type Questions Q.15 On heating the crystals of ferrous sulphate, the colour changes from green to grey. Q.16 Calcium oxide is also called lime or quicklime. Q.17 On heating the crystals of lead nitrate crystals, the emission of brown fumes occurs. Q.18 The thermal decomposition reaction of calcium sulphate (gypsum) is used in black and white photography. Q.19 The decomposition reaction of silver bromide into silver and bromine by light is used in the manufacturing of cement. Q.20 The insoluble substance formed during a chemical reaction is known as a precipitate. Q.21 During endothermic reactions, heat is transferred from the reacting substances to the surroundings. Q.22 The reaction Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s) is an example double displacement reaction. Q.23 Keeping food in airtight containers helps to slow down oxidation. Q.24 Due to corrosion iron gets a brown coating, copper gets a green coating and silver gets a black coating.

Answer 1

Answer:

15 false

16 true

17 true

18 false

19 false

20 true

21 false

22 false

23 true

24 true

hope this Will help you

mark me as Brainliest