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Science ·Class 9 Science

Complete the table by writing the formulae of the compounds formed by the cations. Class 9

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· Jul 06, 2026 · Reviewed & updated Sep 17, 2026 · 1 min read

Complete the table by writing the formulae of the compounds formed by the cations. Class 9


Question 1.

Complete the table by writing the formulae of the compounds formed by the cations on the left and the anions at the top. LiNO3 is given as an example. Class 9

Answer:


NO3-SO42-PO43-
NH4+NH4NO3(NH4),SO4(NH4)3PO4
Li+LiNO3Li2SO4Li3PO4
Al3+Al(NO3)3Al2(SO4)3AlPO4
Cu2+Cu(NO3)2CuSO4Cu3(PO4)2


Working:

NH4+ (valency 1) with NO3- (valency 1): NH4NO3

NH4+ (valency 1) with SO42- (valency 2): (NH4)2SO4

NH4+ (valency 1) with PO43- (valency 3): (NH4)3PO4

Li+ (valency 1) with NO3- (valency 1): LiNO3 (given)

Li+ (valency 1) with SO32- (valency 2): Li2SO4

Li+ (valency 1) with PO43- (valency 3): Li3PO4

Al3+ (valency 3) with NO3- (valency 1): Al(NO3)3

Al3+ (valency 3) with SO42- (valency 2): Al2(SO4)3

Al3+ (valency 3) with PO43- (valency 3): AlPO4 (both valency 3, subscripts both 3, divide by 3 = 1 each, so AlPO4)

Cu2+ (valency 2) with NO3- (valency 1): Cu(NO3)2

Cu2+ (valency 2) with SO42- (valency 2): CuSO4 (both valency 2, simplifies to 1:1) Cu2+ (valency 2) with PO43- (valency 3): Cu3(PO4)2