SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A small piece of sodium is burnt in excess air. The residue formed is dissolved in water to form a colourless solution R. The colourless solution R can
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turn red litmus paper blue
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react with copper(II) oxide
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react with dilute sulphuric acid
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react with magnesium powder
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Explanation:
Detailed explanation-1: -Sulfuric acid is a colorless oily liquid.
Detailed explanation-2: -Concentrated sulphuric acid (conc. H2SO4 acts as a dehydrating agent in the conversion from ethanol to ethane . It helps in removing water molecule (more specifically, the-OH group from one carbon and-H from the other carbon) in the following reaction: CH3CH2OH.
Detailed explanation-3: -When sodium carbonate reacts with sulphuric acid, it produces carbon dioxide gas with effervescence.
Detailed explanation-4: -Complete step by step answer: A carbonate salt on reaction with dilute sulphuric acid and after being heated produces a colorless and odourless gas with brisk effervescence. This gas is carbon dioxide.
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