## 1. The density of neon will be highest at

IIT JEE 1990 States of Matter

## 2. In the equation $\ce{4M + 8CN- + 2H_2O + O_2}$ ------>$4[M {CN_2]^- + 4OH^-}$ Identify the metal M. It is

J & K CET 2004 The d-and f-Block Elements

## 3. In the electrochemical cell :- $\ce{Zn|ZnSO_4(0.01M)||CuSO_4(1.0 M)|Cu,}$ the emf of this Daniel cell is $\ce{E_1}$. When the concentration of $\ce{ZnSO_4}$ is changed to $\ce{1.0M}$ and that of $\ce{CuSO_4}$ changed to $\ce{0.01M}$, the emf changes to $\ce{E_2}$. From the followings, which one is the relationship between $\ce{E_1}$ and $\ce{E_2}$? (Given, $\frac{RT}{F} = 0.059$)

AIPMT 2003 Electrochemistry

## 4. The oil of winter. green is

Rajasthan PMT 2005 Alcohols Phenols and Ethers

## 5. In the P3-, S2- and Cl- ions, the increasing order of size is

AIIMS 1996 Classification of Elements and Periodicity in Properties

## 6. Copper becomes green when exposed to moist air for a long period. This is due to:

JEE Main 2014 Redox Reactions

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

AIPMT 1993 Structure of Atom

## 8. Assertion : Zinc displaces copper from copper sulphate solution.Reason : The E$^{\circ}$298 K of Zn is -0.76 V and that of Cu is +0.34 V.

AIIMS 1999 Electrochemistry

## 9. The salt soluble in excess of sodium hydroxide solution is

COMEDK 2005 The p-Block Elements

## 10. For azimuthal quantum number l =3, the maximum number of electrons will be

AIPMT 1991 Structure of Atom

## 11. Assertion: Aniline hydrogen sulphate on heating, forms a mixture of ortho and para amino benzene sulphonic acids. Reason: The sulphonic acid group is electron withdrawing.

AIIMS 1996 Hydrocarbons

## 12. Which one of the following salt will have the same value of vant Hoff's factor (i) as that of $K_4[Fe(CN)_6]$ ?

AIPMT 1994 Solutions

## 13. Which of the following shows bond in silicone?

AIIMS 2009 The p-Block Elements

## 14. When phenol reacts with $\ce{Br_2}$ in $\ce{CS_2}$ the major product obtained is

JIPMER 2016 Alcohols Phenols and Ethers

## 15. Which of the following statement about hydrogen is incorrect ?

NEET 2016 Hydrogen

## 16. Which of the following statements about pH and $H^+$ ion concentration is incorrect?

AIPMT 2000 Equilibrium

## 17. Carbohydrate is treated with $\alpha$.-naphthol and cone. $H_2 S0_4$. Colour developed at the junction of the two liquids is

Odisha JEE 2009 Biomolecules

## 18. Which of the following explains the sequence of filling the electrons in different shells?

AIIMS 1998 Structure of Atom

## 19. In Bohr’s orbit, $\frac{nh}{2\pi}$ indicates

AIIMS 2012 Structure of Atom

## 20. Select the true statement about benzene amongst the following.

AIPMT 1992 Hydrocarbons

## 21. The pH value of 0.1 M NaOH solution is (when there is a given reaction $[H^+ ][OH^- ] = 10^{-14})$

AIIMS 2000 Equilibrium

## 22. The concentration of $Ag^+$ ion in a given saturated solution of $AgCI$ at $25^{\circ}$C is 1.06 $\times 10^{-5}$ g ion per litre. Thus, the solubility product of AgCI is

Manipal 2010 Equilibrium

## 23. In a lime kiln, to get higher yield of $CO_2$, the measure that can be taken is

KCET 2003 Equilibrium

## 24. Which one forms KHX2 type compound?

AIIMS 2001 The p-Block Elements - Part2

## 25. In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion $\ce{(Ca^{2+}) a}$ and fluoride ion (F-) are

NEET 2016 The Solid State

## 26. Which one of the following coordination entity is chiral ?

COMEDK 2015 Coordination Compounds

## 27. If the distance between $Na^+$ and $Cl^-$ ions in sodium chloride crystal is X pm, the length of the edge of the unit cell is :

KCET 2004 The Solid State

## 28. Reduction of an alkyl cyanide given

COMEDK 2007 Amines

## 29. In the manufacture of sulphuric acid by Contact process, Tyndall box is used to

COMEDK 2010 The p-Block Elements - Part2

## 30. Sodium sulphate is soluble in water whereas barium sulphate is sparingly soluble because

IIT JEE 1989 Classification of Elements and Periodicity in Properties