Question

Explain all chemical reactions of class 10...... Ch 1 science....

Answer 1

Explanation:

Combination Reaction: When two or more substance combine to form a new single substance then it is called as combination reaction.eg.

CaO(s) + H2O(l) → Ca(OH)2 (aq) + Heat

Double Displacement Reaction: When two different atoms or group of atoms are exchanged in a chemical reaction then it is called as a double displacement reaction.

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

Decomposition Reaction: When a substance decomposes to give two or more substance then it is known as decomposition reaction.

2FeSO4(s) Heat→ Fe2O3(s) + SO2(g) + SO3(g)

O2

Displacement Reaction: When an element displaces another element from its compound, a displacement reaction occurs.

Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)

Answer 2

Answer:

types of chemical reactions...

1 combination reaction is a type of reaction in which two or more substance combines to form a single product..

examples

combination between elements

2mgo + 02 --------------- 2mgO

C +02--------------- CO2

combination between two compound

Cao+h2o ----------------- ca(0h2)

Nh3 + hcl ----------------nh4cl

combination between an element and compound

2no+ O2----------------2no2

2co + o2------------- 2Co2

Decomposition reaction is a type of reaction in which a single substance decomposes into two or more substance

examples

thermal decomposition brought by heat

Caco3------------------cao+ co2

2feso4---------------fe2O3+ SO2+SO3

2pb(No3)2-----------2pbo+ 4No3+ O2

photo leases decomposition brought by light

2Agcl2---------------2Ag+cl2

2Agbr2--------------2Ag+Br2

electrolysis decomposition bought by electric current

2nacl-------------2na+cl2

displacement reaction is is a type of reaction in which more active element from its compound present in dissolved state

example.

Fe+ cuso4------------ Feso4+ cu

Zn+ cuso4------------ Znso4 +cu

Pb + cucl2------------ pbcl2 + cu