The number of white coloured salts among the following is: (A) $$SrSO_4$$ (B) $$MgNH_4PO_4$$ (C) $$BaCrO_4$$ (D) $$Mn(OH)_2$$ (E) $$PbSO_4$$ (F) $$PbCrO_4$$ (G) $$AgBr$$ (H) $$PbI_2$$ (I) $$CaC_2O_4$$ (J) $$Fe(OH)_2(CH_3COO)$$

The question asks for the number of white coloured salts among the given compounds. We will evaluate each compound based on standard colour properties.

Compound (A) SrSO₄ (Strontium sulfate):
Strontium sulfate is a white crystalline solid. It is insoluble in water and retains its white colour.
Colour: White

Compound (B) MgNH₄PO₄ (Magnesium ammonium phosphate):
Magnesium ammonium phosphate is a white crystalline precipitate, commonly formed in qualitative analysis for magnesium ions.
Colour: White

Compound (C) BaCrO₄ (Barium chromate):
Barium chromate is a yellow solid, often used as a yellow pigment. It is not white.
Colour: Yellow

Compound (D) Mn(OH)₂ (Manganese(II) hydroxide):
Manganese(II) hydroxide is initially white when freshly precipitated, though it oxidizes to brown on exposure to air. The pure compound is white.
Colour: White

Compound (E) PbSO₄ (Lead sulfate):
Lead sulfate is a white crystalline solid and insoluble in water.
Colour: White

Compound (F) PbCrO₄ (Lead chromate):
Lead chromate is a bright yellow solid, known as chrome yellow. It is not white.
Colour: Yellow

Compound (G) AgBr (Silver bromide):
Silver bromide is a pale yellow solid, sensitive to light. It is not white.
Colour: Pale yellow

Compound (H) PbI₂ (Lead iodide):
Lead iodide is a bright yellow solid at room temperature.
Colour: Yellow

Compound (I) CaC₂O₄ (Calcium oxalate):
Calcium oxalate is a white crystalline solid and insoluble in water.
Colour: White

Compound (J) Fe(OH)₂(CH₃COO) (Iron(II) acetate hydroxide):
This compound is a basic salt of iron(II). Iron(II) hydroxide is white when pure but oxidizes rapidly to green or brown. The acetate form is typically greenish or brown due to oxidation and is not considered white.
Colour: Not white (green/brown)

Summary of white salts:
- (A) SrSO₄: White
- (B) MgNH₄PO₄: White
- (D) Mn(OH)₂: White
- (E) PbSO₄: White
- (I) CaC₂O₄: White
Total: 5 white salts.

The compounds (C), (F), (G), (H), and (J) are not white.

Final Answer: 5