Chemistry Question and Answers

1. In the brown ring test, the brown colour of the ring is due to

KCET 2008 The p-Block Elements - Part2

2. Assertion: When acetamide reacts with NaOH and Br₂, methyl amine is formed.
Reason: The reaction occurs through intermediate formation of isocyanate.

AIIMS 2016 Amines

3. How many ions per molecule are produced in the solution when Mohr salt is dissolved in excess of water ?

KCET 2015 Coordination Compounds

4. The half life of a substance in a certain enzymecatalysed reaction is 138 s. The time required for the concentration of the substance to fall from $ 1.28 \, mg \, L^{-1} $ to $0.04 \, mg \, L^{-1}$, is -

AIPMT 2011 Chemical Kinetics

5. (CH$_3 )_3$CMgCl on treatment with D$_2O$ produces

IIT JEE 1997 Haloalkanes and Haloarenes

6. $CH_3CH_2OH$ is converted into $CH_3CHO$ in the presence of

Punjab PMET 2005 Alcohols Phenols and Ethers

7. Assertion : Ethers behave as bases in the presence of mineral acids.
Reason : It is due to the presence of lone pair of electrons on the oxygen.

AIIMS 2008 Alcohols Phenols and Ethers

8. Assertion : An increase in surface area increases the rate of evaporation.
Reason : Stronger the inter‐molecular attractive forces, fast is the rate of evaporation at a given temperature.

AIIMS 2002 Surface Chemistry

9. Which of the following values for enthalpy of formation shows that the compound is least stable?

COMEDK 2005 Thermodynamics

10. Which one of the following is an antihistamine?

JIPMER 2015 Chemistry in Everyday Life

11. Identify the correct order of solubility in aqueous medium :

NEET 2013 The d-and f-Block Elements

12. Which of the following compounds are optically active?

AIIMS 2012 Haloalkanes and Haloarenes

13. The number of moles of $\ce{KMnO_4}$ that will be needed to react with one mole of sulphite ion in acidic solution is

AIPMT 2007 Organic Chemistry – Some Basic Principles and Techniques

14. 0.44 g of a monohydric alcohol when added to methylmagnesium iodide in ether liberates at S.T.P., 112 $cm^3$ of methane. With PCC the same alcohol forms a carbonyl compound that answers silver mirror test. The monohydric alcohol is

KCET 2014 Alcohols Phenols and Ethers

15. A cross-linked polymer is

JIPMER 2014 Polymers

16. Half life of a radioactive substance is 6 minute If its initial amount is 32 g,. then amount present after 18 minute is

Jharkhand CECE 2006 Chemical Kinetics

17. At certain temperature, 50% of HI is dissociated into $H_2$ and $I_2$, the equilibrium constant is

AIPMT 1994 Equilibrium

18. The pair whose both species are used in antiacid medicinal preparation is

AIIMS 2006 The s-Block Elements

19. A basic lining is given to a furnace by using

KCET 1997 General Principles and Processes of Isolation of Elements

20. The quantity of electricity required to liberate $112\,cc$ of hydrogen at STP from acidified water is

KCET 2001 Electrochemistry

21. Which of the following is not hygroscopic?

AIIMS 2011 The s-Block Elements

22. The glycosidic linkage involved in linking the glucose units in amylose part of starch is

KCET 2018 Biomolecules

23. Sodium cyanide is added as a depressant in the froth floatation process when the ore contains a mixture of $\ce{ZnS}$ and $\ce{PbS}$. This is because

COMEDK 2014 General Principles and Processes of Isolation of Elements

24. The length of C – C bond in benzene is

AIIMS 2002 Hydrocarbons

25. A colloidal solution is kept in dark and is illuminated by a beam of light then, brightness appears at the right angle of direction of light. This effect is called

AIIMS 2015 Surface Chemistry

26. Sucrose is NOT a reducing sugar since

KCET 2012 Biomolecules

27. Which of the following reagents would distinguish cis-cyclopenta-1, 2-diol from the trans-isomer ?

NEET 2016 Aldehydes Ketones and Carboxylic Acids

28. The paramagnetic nature of oxygen molecular is best explained on the basis of

Maharashtra CET 2006 Chemical Bonding and Molecular Structure

29. During extraction of aluminium from bauxite,

JIPMER 2015 General Principles and Processes of Isolation of Elements

30. The heat of combustion of carbon to $\ce{CO_2}$ is $\ce{- 393.5 \, kJ/mol}$. The heat released upon formation of 35.2 g of $\ce{CO_2}$ from carbon and oxygen gas is:

AIPMT 2015 Thermodynamics

Chemistry Questions