Tag: chemistry

Questions Related to chemistry

Replacement of diazonium group of fluorine is known as:

chemistry amines chemical reactions of diazonium salts chemical properties of diazonium salts diazonium salts

  1. Gattermann reaction

  2. Sandmeyer reaction

  3. Balz-Schiemann reaction

  4. Etard reaction

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Correct Option: C

3- Amino-2, 3-dimethyl butan-2-ol when treated with $ NaNO _{2}/HCl$ gives product (X). (X) on treatment with $LiAlH _{4}$ forms (Y). (Y) on heating with $conc. H _{2}SO _{4}$ forms (Z). The molecular weight of (Z) is :

chemistry amines chemical reactions of diazonium salts chemical properties of diazonium salts diazonium salts

  1. 81

  2. 82

  3. 83

  4. 84

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Correct Option: D
Explanation:

3- Amino-2, 3-dimethyl butan-2-ol is diazotized with sodium nitrite in presence of HCl at low temperature to obtain 3,3-dimethylbutan-2-one (compound X).
The carbonyl group is then reduced to obtain 3,3-dimethylbutan-2-ol (compound Y). This is followed by dehydration to obtain 2,3-dimethylbut-2-ene (compound Z).

Cyanide group on hydrolysis give:

chemistry organic compounds containing nitrogen chemical reactions of diazonium salts chemical properties of diazonium salts diazonium salts

  1. acid

  2. acetamide

  3. amine

  4. hydrate

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Correct Option: A
Explanation:
$\displaystyle \underset{Cyanide}{RCN} \xrightarrow{H _2O} \underset{Amide}{RCONH _2}   \xrightarrow{H _2O} \underset{Acid}{RCOOH} + \underset{Ammonia}{NH _3}$
$\therefore $ Hydrolysis of cyanide results in formation of acid.

The reagent commonly used to determine hardness of water titrimetrically is:

chemistry organic compounds containing nitrogen chemical reactions of diazonium salts chemical properties of diazonium salts diazonium salts

  1. Oxalic acid

  2. Disodium salt of EDTA

  3. Sodium citrate

  4. Sodium thiosulphate

  5. None of these

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Correct Option: B
Explanation:

The total hardness of water (i.e. the concentration of dissolved cations such as $Ca^{2+}, Mg^{2+}, Fe^{3+}$ etc.) is commonly determined by the titration of a water sample with a standardized solution of the disodium salt of ethylenediaminetetraacetic acid (EDTA) using eriochrome black T or calmagite as an indicator. Calmagite has the advantage of forming indefinitely stable solutions and will be substituted without any other modification to the procedure.
Hence option B is correct.

Shweta found her pet's cloth discoloured and decided to renovate the dress by colouring it. Which of the following solution of compound should she choose to do so?

chemistry organic compounds containing nitrogen chemical reactions of diazonium salts chemical properties of diazonium salts diazonium salts

  1. Ammonia

  2. Ester

  3. Diazonium salts

  4. Aldehyde

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Correct Option: C
Explanation:

Diazonium salts are used for making azo dye at lone temperature by coupling with $\beta$-naphthol or any other alcohol. and is used for dyeing clothes.

Which of the following compound should we choose with Aryldiazonium salt to produce Azo dyes?

chemistry organic compounds containing nitrogen chemical reactions of diazonium salts chemical properties of diazonium salts diazonium salts

  1. Phenol

  2. Arylamines

  3. Both A and B

  4. Diazonium salt is already coloured

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Correct Option: C
Explanation:

Aryldiazonium salt when taken with phenol or arylamines produces azo dyes.

When diazonium salt solution is treated with water at a temperature of 283 K it forms:

chemistry organic compounds containing nitrogen chemical reactions of diazonium salts chemical properties of diazonium salts diazonium salts

  1. ester

  2. alcohol

  3. amines

  4. phenol

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Correct Option: D

Which of the following is correct method to convert p-toluidine to p-toluic acid?

chemistry organic compounds containing nitrogen chemical reactions of diazonium salts chemical properties of diazonium salts diazonium salts

  1. $ Diazotisation, \, CuCN, \, H _2/Pd$

  2. $CHCl _3/NaOH,\, KCN, \, Sn/HCl$

  3. $ Diazotisation, \, CuCN/KCN, H _2O/H^+$

  4. $ Diazotisation, \, NaCN, \, NaOH$

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Correct Option: C

Nuclear force is communicated from one nucleon to another via a particle called.

chemistry nuclear physics hazards and safety measures of radiations harmful effects and safety precautions for radiations energy production

  1. Pion

  2. Muon

  3. Kaon

  4. Quark

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Correct Option: A

Fill in the blank.
__________ arises from the 'burning' of uranium fuel in a nuclear reactor. 

chemistry nuclear physics hazards and safety measures of radiations harmful effects and safety precautions for radiations energy production

  1. Low-level- waste

  2. High-level waste

  3. Intermediate level waste

  4. Very low level waste

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Correct Option: B
Explanation:

High level waste 

High level radioactive waste are highly radioactive materials produced as a by product of the nuclear reactions that occurs inside the nuclear reactor.