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Question
Name a white, insoluble oxide that dissolves when fused with caustic soda or caustic potash.
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Solution
Al oxide
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What do you understand by the following:
Qualitative analysis
What do you understand by the following:
Reagent
Z is a compound. With dilute HCl it gives a gas turning dichromatic solution green. Z gives lilac flame. Name Z.
State what do you observe when:
Sulphur burns.
Match the following :
| Column A | Column B |
| 1. A substance that turns moist starch iodide paper blue. |
A. Ammonium sulphate |
| 2. A compound which releases a reddish brown gas on reaction with concentrated sulphuric acid and copper turnings. |
B. Lead carbonate |
| 3 . A solu tion of this compound gives a dirty green preci pi ta te with sodium hydroxide. |
C. Chlorine |
| 4 . A compound which on heating with sodium hydroxide produces a gas which forms dense white fumes with hydrogen chloride. |
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| 5 . A white solid which gives a yellow residue on heating. |
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From the list given below, select the word(s) required to complete the blanks (i) to (v) in the following passage:
Note: words chosen from the list are to be used only once. Write only the answers. Do not copy the passage.
[reddish brown, ammonium, nitrogen dioxide, hydroxyl, dirty green, ammonia, acidic, alkaline]
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Copper sulphate solution with ammonium hydroxide solution.
Write balanced equation:
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Write balanced equations for a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.
Write balanced equations for a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
