Chemistry Question and Answers

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 P^3-, S^2- 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

Chemistry Questions