Chemistry Question Bank

Among the following which compound gives precipitate with AgNO3 solution? (a) (b) (c)

Which of the following compounds will answer Lassaigne’s test for nitrogen

Which of following will give Lassaigne’s test for nitrogen

The oxygen is estimated in the organic compound by

In Lassaigne’s test when both N and S are present, blood red colour obtained is due to the formation of–

Kjeldahl’s method is used in the estimation of–

Dumas method involves the determination of nitrogen content in the organic compound in form of–

Which of the following statements is wrong?

Sulphur is estimated by Carius method in the form of

Compounds which do not contain halogen but give positive Beilstein test?

Which Metal cyanide give a positive Lassaigne’s test for nitrogen?

Lassaigne’s test is not shown by diazonium salts. Why?

What conclusion would you draw if during Lassaigne‘s test, a blood red colouration is obtained?

What type of organic compounds cannot be Kjeldahlised?

How is phosphorus estimated in an organic compound?

Will you get any precipitate if you add silver nitrate solution to chloromethane? If not, why?

Sodium nitrorusside Na2[Fe(CN)5NO] is used as reagent for detection of ______ and the compound formed is ____.

If N and S both are present in an organic compound during Lassaigne’s test, both will change into

CCl4 & acetone differ in their boiling Point. So it can be seperated through fractional distillation. Hence (b) is correct.

Steam distillation is used only in case of steam volatile substance. Hence (c) is not correct. 4. Vaccum distillation is used in liquids which decompose at their boiling Point. Hence (d) is incorrect.

Anthracene can be purified by

Assertion (A): During test for nitrogen with Lassaigne’s extract on adding FeCl3 solution sometimes a red precipitate is obtained. Reason (R): Sulphur is also present (AIIMS2007)

Assertion (A): Oils are purified by steam distillation. Reason (R): The compounds which decompose at their boiling points can be purified by steam distillation. (AIIMS2008)

Assertion (A): S || NH – C– NH gives red color in Lassaigne’s test Reason (R): Compounds having N along with C give red colour in Lassaigne’s test. (AIIMS2009)

A hydrocarbon has carbon and hydrogen. Its molecular weight is 28. Its possible formula would be (AFMC 2009) (a) C H (b) C H (c) CH (d) C H Ans. (b) Sol. Compound Molecular weight C H 12 3 x C H x CH C H x Henc…