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I am a yellow solid  put me in water I produce effervescence and a colourless gas which relights a glowing splint 
hint;add me to water and the resulting solution is alkaline

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Oxygen gas 
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Sodium peroxide 
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Sodium peroxide 
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Sodium peroxide 
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Sodium peroxide 
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Sodium peroxide
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Sodium peroxide
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Sodium peroxide 

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