Chemistry Question and Answers

1. The colour of sky is due to

KCET 2008 Surface Chemistry

2. Which one of the following does not form sodium bisulphite addition product with sodium bisulphite solution?

J & K CET 2009 Aldehydes Ketones and Carboxylic Acids

3. The number of atoms in 100 g of an $fcc$ crystal with density, $d = \ce{10\, g/cm^3}$ and cell edge equal to 100 pm, is equal to

JIPMER 2014 The Solid State

4. The weight of one molecule of a compound $C_{60} H_{12}$ is

BHU 2007 Some Basic Concepts of Chemistry

5. $ Zn | Zn^{2+} (a = 0.1M) || Fe^{2+} (a = 0.01M) | Fe.$ The emf of the above cell is 0.2905 V. Equilibrium constant for the cell reaction is

IIT JEE 2004 Electrochemistry

6. A complex PtCl₄.5NH₃ shows a molar conductance of 402 ohm^-1 cm² mol^-1 in water and precipitates three moles of AgCl with AgN0₃ solution. The formula of the complex is

AIIMS 2010 Coordination Compounds

7. A solution is 0.1 M with respect to $Ag^+, Ca^{2+}, Mg^{2+}$ and $Al^{3+}$ which will precipitate at lowest concentration of $[PO_4^{3-}]$ when solution of $Na_3PO_4$ is added?

Delhi UMET 2011 Equilibrium

8. Solutions with same osmotic pressures are called

AFMC 2001 Solutions

9. Which of the following is the strongest acid ?

BHU 1998 Aldehydes Ketones and Carboxylic Acids

10. Assertion : Absorption spectrum consists of some bright lines separated by dark spaces.
Reason : Emission spectrum consists of dark lines.

AIIMS 2002 Structure of Atom

11. Which material is used as a neutron moderator?

AIIMS 2011 The p-Block Elements

12. Energy of an electron is given by $\hspace15mm E=-2.178 \times 10^{-18} \, J$ Wavelength of light required to excite an electron in an hydrogen atom from level n = 1 to n = 2 will be $ \, \, \, (6.62 \times 10^{-34} \, Js \, and \, \, c=3.0 \times 10^8 \, ms^{-1})$

JEE Main 2013 Structure of Atom

13. Assertion : $\ce{PbI4}$ is a stable compound.
Reason : Iodide stabilizes higher oxidation state

AIIMS 2003 The p-Block Elements

14. The mercury is the only metal which is liquid at 0°C. This is due to its

AIPMT 1995 The d-and f-Block Elements

15. Which of the following elements will have the highest electron affinity ?

AIIMS 1994 Classification of Elements and Periodicity in Properties

16. Which of the following will give maximum number of isomers?

AIPMT 2001 Coordination Compounds

17. Consider the following compounds:
(i) $\ce{ C_6H_5COCl}$
The correct decreasing order of their reactivity towards hydrolysis is:

AIPMT 2007 Aldehydes Ketones and Carboxylic Acids

18. if ionisation potential for hydrogen atom is 13.6 eV, then ionisation potential for $He^+$ will be

AIPMT 1993 Structure of Atom

19. The repeating unit in silicone is

AIIMS 2007 The p-Block Elements

20. When 22.4 L of $H_2$(g) is mixed with 11.2 L of $Cl_2$(g), each at STP, the moles of HCl(g) formed is equal to

AIPMT 2014 Some Basic Concepts of Chemistry

21. Which of the following reactions does not take place?
$\ce{BF3 + F^{-} ->BF4^{-}}$$\quad\quad\quad\quad\quad\quad\quad\quad\ldots\left(I\right)$
$\ce{BF3 + 3F^{-} ->BF6^{3-}}$$\quad\quad\quad\quad\quad\quad\quad\ldots\left(II\right)$
$\ce{AlF3 + 3F^{-} ->AlF6^{3-}}$$\quad\quad\quad\quad\quad\quad\ldots\left(III\right)$

AIIMS 2016 The p-Block Elements

22. A pale blue liquid obtained by equimolar mixture of two gases at $- 30^\circ\, C$ is

IIT JEE 2005 The p-Block Elements - Part2

23. Bleaching powder is obtained by the action of chlorine gas and

AIPMT 1988 The s-Block Elements

24. Which of the following is not correct ?

EAMCET 2005 Biomolecules

25. Substances used in bringing down the body tem-perature in high fevers are called

AIPMT 1990 Chemistry in Everyday Life

26. The volume strength of 1.5 NH$_2O_2$ is

IIT JEE 1990 Some Basic Concepts of Chemistry

27. In a set of reactions, acetic acid yielded a product D.
$CH_3COOH\xrightarrow{SOCL_2} A\xrightarrow [anhy. AICI_3]{Benzene}B\xrightarrow {HCN}C\xrightarrow {HOH}D$
The structure of D would be

AIPMT 2005 Aldehydes Ketones and Carboxylic Acids

28. The relative ease of dehydration of alcohol is

JIPMER 2016 Alcohols Phenols and Ethers

29. The final product C, obtained in this reaction would be

AIPMT 2003 Amines

30. Which of the following is not a colligative property ?

Manipal 1995 Solutions

Chemistry Questions