Question

balance the eqations:-

Answer 1

NOTE: These 're only the answers to ur queries.
3. Al2O3 + 3H2SO4➡ Al2 (SO4)3 + 3H2O.

4. 2Pb(NO3)2➡2PbO + 4NO2 + O2.

5. 2KMnO4➡K2MnO4 + MnO2 +O2.

Hope it helps....

Answer 2

[1]

$Al_{2} O_{3} + H_{2}SO_{4} --> Al_{2} (SO_{4})_{3} + H_{2}O\\ Al_{2} O_{3} + H_{2}SO_{4} --> Al_{2} S_{3}O_{12} + H_{2}O\\ Al_{2} O_{3} + 3H_{2}SO_{4} --> Al_{2} S_{3}O_{12} + 3 H_{2}O$

Equation Is balanced ...

Checking ...

In LHS :

Al - 2

O - 3 + 3 * 4 = 15

H - 6

S - 3

In RHS :

Al - 2

O - 3 * 4 + 3 = 15

H - 6

S - 3

[ 2 ]$Pb(NO_{3})_{2} --> PbO + NO_{2} + O_{2}$

$2 Pb(NO_{3})_{2} --> 2PbO + 4NO_{2} + O_{2}$

Equation is balanced...

Checking ...

LHS :

Pb - 2

N - 4

O - 12

RHS :

Pb - 2

N - 4

O - 12

[ 3 ] $KMnO_{4} --> K_{2} MnO_{4} + MnO_{2} + O_{2}$

$2KMnO_{4} --> K_{2} MnO_{4} + MnO_{2} + O_{2}$

Equation Is balanced ...

Checking ...

LHS :

K - 2

Mn - 2

O - 8

RHS :

K - 2

Mn - 1 + 1 = 2

O - 4 + 2 + 2 = 8

Therefore All Equation Are Balanced