MCQ Solution: S – Block Elements
A colourless salt colours a bunsen flame as golden yellow, and, also turns moistened litmus paper into blue colour. The substance is:
1) Na2CO3
2) NaCl
3) Cu(OH)2
4) K2CO3
Solution
Golden yellow colour in bunsen flame indicates the presence of sodium. The colour change of moist litmus, from red to blue, indicates alkaline medium. Hence, the substance is sodium carbonate (Na2CO3).
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