Chemistry Question Bank

How will you separate iodine from sodium chloride?

When 0.32g of a compound is heated with conc. HNO₃ and BaCl₂, 0.932g BaSO₄ is obtained. The percentage of sulphur in the compound is

A mixture of acetone and CCl₄ can be separated by

An organic compound contains C, H, N, S and Cl. For the detection of chlorine, the sodium extract of the compound is first heated with a few drops of concentrated HNO₃ and then AgNO₃ is added to get a white ppt. of Ag…

Which of the following will not give test for ‘N’ in sodium extract?

Azeotropic distillation is used only to seperate azeotropes ie. constant boiling mixture. Here acetone & CCl₄ are not azeotropic mixture. Hence (a) is not correct.

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

Sulphur is estimated by Carius method in the form of

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

Which of the following statements is wrong?

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

The prussian blue colouration obtained in the test for nitrogen in the organic compound 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.

1 percent composition of an organic compound A is carbon: 85.71% and hydrogen 14.20% . Its vapour density is 14. Consider the following reaction sequence Cl /H O (i) KCN/EtOH (ii) H O A B C → → Identify C (EAMCET 2009…

Phenols contains acidic H it reacts with KOH.

0.395 g of an organic compound by Carius method for the estimiation of sulphur gave 0.582 g of BaSO₄. The percentage of sulphur in the compound is–

Which of the following observations is correct and is used in the identification of carboxylic acids?

An organic compound is heated with HNO₂ at 0 °C and then the resulting solution is added to a solution -napthol whereby a brilliant red dye is produced. The observations indicate that the compound possesses.

A hydrocarbon contains 80% carbon. What is the empirical formula of the compound? (KCET 2009 )

Violet coloured complex obtained in the detection of sulphur is (AFMC 2010) (a) Na Fe(NO)(CN) (b) Na Fe(ONS)(CN) (c) Na Fe(CN) NOS

Camphor is purified by (Kerala PMT 2014)

An organic compound which produces a bluish green coloured flame on heating in presence of copper is (AIIMS 2014)

In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75g of sample neutralised 10 mL of 1M H SO . The percentage of nitrogen in the soil is (CBSE AIPMT 2014)

Paper chromatography has following mobile and stationary phases respectively (Bihar CECE 2015)