Question
Draw the structures of the following:
- $H_2S_2O_7$
- $XeF_6$
✓
Answer
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Compound (A) is formed when aniline is treated with $NaNO _2+ HCl$ at 273-278 K. Compound (B) is formed when cuprous chloride is added to (A).
Write the name of compound (A) and (B) and the equations of the chemical reactions involved.
→Write the name of compound (A) and (B) and the equations of the chemical reactions involved.
(i) Give two methods in which $> C = O$ group is converted into $> C H _2$ group.
(ii) In the purification of aldehydes sodium bi-sulphite is used, why?
→(ii) In the purification of aldehydes sodium bi-sulphite is used, why?
Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: $\ce{NaCl}$ reacts with concentrated $\ce{H_2SO_4}$ to give colourless fumes with pungent smell. But on adding $\ce{MnO_2}$ the fumes become greenish yellow.
Reason: $\ce{MnO_2}$ oxidises $\ce{HCl}$ to chlorine gas which is greenish yellow.
→Assertion: $\ce{NaCl}$ reacts with concentrated $\ce{H_2SO_4}$ to give colourless fumes with pungent smell. But on adding $\ce{MnO_2}$ the fumes become greenish yellow.
Reason: $\ce{MnO_2}$ oxidises $\ce{HCl}$ to chlorine gas which is greenish yellow.
Write down the reactions taking place in Blast furnace related to the metallurgy of iron in the temperature range 500-800K.
Explain why low molecular mass alcohols are soluble in water.
Match the common names given in Column I with the IUPAC names given in Column II.
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Column I
(Common names)
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Column II
(IUPAC names)
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(i)
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Cinnamaldehyde
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(a)
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Pentanal
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(ii)
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Acetophenone
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(b)
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Prop-2-enal
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(iii)
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Valeraldehyde
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(c)
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4-Methylpent-3-en-2-one
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(iv)
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Acrolein
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(d)
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3-Phenylprop-2-enal
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(v)
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Mesityl oxide
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(e)
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1-Phenylethanone
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Explain the preparation of carboxylic acid from esters with necessary equations.
Food cooks quickly in pressure cooker but slowly in mountains. Explain it.
How can you separate alumina from silica in a bauxite ore associated with silica? Give equations, if any.
State the role of silica in the metallurgy of copper.