A-LevelChemistryGroup 29701/12 · Feb/Mar 2021 · Q141 Mark

Which row correctly describes one property of barium and one property of barium oxide? observation when barium metal is added to water pH of solution obtained when a spatula measure of BaO is added to 100 cm³ of water A a few gas bubbles form on the metal surface 8 B a few gas bubbles form on the metal surface 13 C rapid effervescence is seen 8 D rapid effervescence is seen 13

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Afew gas bubbles form on the metal surface, pH 8

Bfew gas bubbles form on the metal surface, pH 13

Crapid effervescence is seen, pH 8

Drapid effervescence is seen, pH 13

✓ Correct answer

D: rapid effervescence is seen, pH 13

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