Question

plz answer these questions​

Answer 1

2.a.Lead nitrate

b. Nitrogen gas

c. Neutrilisation chemical reaction

d. 2Pb(NO3) 2---------->2PbO+4NO2+O2

3.a.PoP is white colourless substance which become hard when comes in contact with water.

The chemical formula for the plaster of Paris is (CaSO4) H2O

b. The compound plaster of Paris is prepared by heating gypsum at 120oC.FOR EQUATION SEE THE ATTACHMENT.

c. 1.It is commonly used to precast and hold parts of ornamental plaster work placed on ceilings and cornices.

2.It is also used in medicine to make plaster casts to immobilize broken bones while they heal, though many modern orthopedic casts are made of fibre glass or thermoplastics.

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Answer 2

Question 2

Answers

a) Salt is Lead Nitrate Pb(NO3)2.

b) Brown Fumes are of Nitrogen dioxide gas (NO2)

c) It is Endothermic, as heat is required.

d) Chemical Equation as follows

2Pb(NO3)2 ----->2PbO + 4NO2 +O2.

Question 3

Answers

a) Plaster of Paris is Calcium Sulphate Hemi-hydrate (CaSo4.1/2H2O), which is obtained by heating Gypsum.

b) It is prepared by Heating Gypsum.

Reaction Involved is

CaSo4.2H20 ------> CaSo4.1/H2O + 1 1/2 H20.

c) Used in hospital for plaster , (fracture) and also in construction works.

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