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1. The formula mass of \(NaCl\) is -
2. Which of the following sets of ions is present in potassium sulphate (\(K_2SO_4\)) ?
Answer variants:
56.5 u
\(K^+{^4}\), \(SO_2{^-}\)
\(K^+{^2}\), \(SO_4{^-}\)
58.5 u
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