## 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