Question

Section - B
3 Marks Questions
Chap - 1 Chemical Reactions and Equations
01 Write the chemical reaction and type of reaction of the following.
a) Burning of Mg strip in air.
b) Electrolysis of water
c) Ammonia mix with HCl gas.
02 When silver nitrate and sodium cloride soultions are mix, White
precipitates are obtained. Name the white ppts and name the
type of reaction. Silvol chloride - Precce neatic
03 Write one example of exothermic and endothermic reaction.
04 Give reason : “Zn plate is used to prevent corrosion of ship”
05 Give reason: "Food items should be stored in closed vessel”
06 Give reason : “ Silver nitrate is stored in brown bottle“
07 Give the difference :
a) Exothermic and endothermic reaction
b) Oxidation and reduction
08 Difference between displacement and double displacement
reaction with example.​

Answer 1

Answer:

1)mgo

h++,o-

nh3cl

Silver chloride is a chemical compound with the chemical formula AgCl. This white crystalline ... IUPAC name ... This precipitation is general for silver nitrate's reaction with soluble chloride salts and is not unique simply to cobalt. ... equally colorless solution of sodium chloride produces an opaque white precipitate of AgCl:.

Endothermic and exothermic reactions are chemical reactions that absorb and release heat, respectively. A good example of an endothermic reaction is photosynthesis. Combustion is an example of an exothermic reaction. ... In any given reaction, heat is both absorbed and released

Oxidation is the loss of electrons or an increase in the oxidation state of an atom by another atom, an ion, or a molecule. Reduction is the gain of electrons or a decrease in the oxidation state of an atom by another atom, an ion, or a molecule.

Double displacement reaction: The reaction in which two different atoms or group of atoms (ions) are displaced by other atoms or group of atoms (ions) is known as double displacement reaction.

Example Na2SO4(aq) + BaCl2 (aq)  BaSO4(s) + 2NaCl(aq)

(Sodium Sulphate) (Barium chloride) (Barium Sulphate) (Sodium Chloride )

Here, SO42- displaces Cl- ions and Cl- ions displace SO42- ions or both ions exchange each other. These reactions occur in ionic compounds.