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9:41 􀛨 􀙇
Chemistry
WAEC 2023

Which of the following salts is insoluble in water?

A Sodium trioxonitrate(V)
B Potassium chloride
C Barium tetraoxosulphate(VI)
D Ammonium chloride
Why C. All sodium, potassium and ammonium salts dissolve. Most sulphates do too — BaSO₄, PbSO₄ and CaSO₄ are the exceptions you're expected to know.

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Chemistry · WAEC
2024 2023 2022 2021 2020 2019 2018 2017

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Which exams are covered?

WAEC, NECO and NABTEB — including the GCE variant of each, listed alongside the main paper rather than hidden somewhere separate.

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Your subscription follows your account, so you can change phone and lose nothing. But only one device can be signed in at a time — signing in somewhere new signs out the old one. That's what keeps the price at ₦700 rather than one account being shared around a whole class.

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