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If a metal R forms a compound with the formula R(NO3)2 the formula of its...

Chemistry
WAEC 2001

If a metal R forms a compound with the formula R(NO3)2 the formula of its tetraoxosulphate (VI) is

  • A. R(SO4)2
  • B. RSO4
  • C. R2SO4
  • D. R2(SO4)3
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Correct Answer: Option B
Explanation

The compound R formed with  R(NO3)2 shows that the metal R has a valency of +2. 

If R reacts with tetraoxosulphate(VI), SO4  2- has a valency of - 2.

If both react or combine together, their valencies will cancel out each other, which implies the formula will be RSO4.

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