Please select a subject first
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Give one example each of sol and gel.
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Write equations of the following reactions:
Acetylation of aniline
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An unripe mango placed in a concentrated salt solution to prepare pickle, shrivels because ______.
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Consider the figure and mark the correct option.
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Water retention or puffiness due to high salt intake occurs due to ______.
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Why are aquatic species more comfortable in cold water in comparison to warm water?
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When kept in water, raisin swells in size. Name and explain the phenomenon involved with the help of a diagram. Give three applications of the phenomenon.
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How will you distinguish between dispersed phase and dispersion medium in an emulsion?
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In the preparation of \[\ce{H2SO4}\] by Contact Process, why is \[\ce{SO3}\] not absorbed directly in water to form \[\ce{H2SO4}\]?
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Write the structure of pyrophosphoric acid.
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Match the formulas of oxides given in Column I with the type of oxide given in Column II and mark the correct option.
| Column I | Column II |
| (A) \[\ce{Pb3O4}\] | (1) Neutral oxide |
| (B) \[\ce{N2O}\] | (2) Acidic oxide |
| (C) \[\ce{Mn2O7}\] | (3) Basic oxide |
| (D) \[\ce{Bi2O3}\] | (4) Mixed oxide |
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Assertion: \[\ce{SF6}\] cannot be hydrolysed but \[\ce{SF4}\] can be.
Reason: Six \[\ce{F}\] atoms in \[\ce{SF6}\] prevent the attack of \[\ce{H2O}\] on sulphur atom of \[\ce{SF6}\].
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\[\begin{array}{cc}
\ce{CH3 - C ≡ CH ->[40{%} H2SO4][1{%} HgSO4] A ->[Isomerisation] CH3 - C - CH3}\\
\phantom{........................................}||\\
\phantom{........................................}\ce{O}\\
\end{array}\]
Structure of ‘A’ and type of isomerism in the above reaction are respectively.
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Arenium ion involved in the bromination of aniline is:
(i)
(ii)
(iii)
(iv)
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Why is benzene diazonium chloride not stored and is used immediately after its preparation?
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Why does acetylation of –NH2 group of aniline reduce its activating effect?
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Predict the product of reaction of aniline with bromine in non-polar solvent such as \[\ce{CS2}\].
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Why is aniline soluble in aqueous HCl?
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How will you carry out the following conversions?
toluene `->` p-toluidine
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How will you carry out the following conversions?
p-toluidine diazonium chloride `→` p-toluic acid
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