Chemistry Question and Answers

1. A certain current liberated 0.504 g of hydrogen in 2 hours. How many grams of copper can be liberated by the same current flowing for the same time in copper sulphate solution?

AIIMS 1998 Electrochemistry

2. The shape of a molecule of NH$_3$, in which the central atom contains a lone pair of electrons, is

Maharashtra CET 2003 Chemical Bonding and Molecular Structure

3. The process of zone refining is used in the purification of

KCET 2013 General Principles and Processes of Isolation of Elements

4. The arrangement of $ X^- $ ions around $ A^+ $ ion in
solid $AX$ is given in the figure (not drawn to scale). If the
radius of $ X^- $ is $250\, pm$, the radius of $ A^+ $ is

JEE Advanced 2013 The Solid State

5. The temperature of the system decreases in an_________

KCET 2005 Thermodynamics

6. A solution of $(-1) 1-chloro-1-$phenylethane in toluene racemises slowly in the presence of a small amount of $SbCl_5$, due to the formation of

JEE Main 2013 Haloalkanes and Haloarenes

7. The bond that determines the secondary structure of proteins is

JIPMER 2010 Biomolecules

8. Which of the following cannot act both as Bronsted acid and as Bronsted base ?

NEET 2019 Equilibrium

9. The radii of the F, $F^-$, O and $O^{2-}$ are in the order

EAMCET 1998 Classification of Elements and Periodicity in Properties

10. An electron having spin quantum number, $s = -1/2$ and magnetic quantum number, $m = + 3$ can be present in

COMEDK 2012 Structure of Atom

11. Faraday's laws of electrolysis are related to the

IIT JEE 1983 Electrochemistry

12. $9.65$ coulombs of electric current is passed through fused anhydrous $MgCl_2$ The magnesium metal thus obtained is completely converted into a Gringard regent .The number of moles of Grignard reagent obtained is ____________

KCET 2011 Electrochemistry

13. The chemical reaction,
$\quad$$\quad$$2AgCl_{(s)} + H_{2(g)} \to 2HCl_{(aq)} + 2Ag_{ (s)}$
taking place in a galvanic cell is represented by the notation

AIIMS 2005 Electrochemistry

14. Sanger's reagent is used for the identification of

Odisha JEE 2009 Biomolecules

15. The distillation technique most suited for separating glycerol from spent-lye in the soap industry is :

JEE Main 2016 Organic Chemistry – Some Basic Principles and Techniques

16. Threshold frequency of a metal is 5 × 10¹³ s^-1 upon which 1 × 10¹⁴ s^-1 frequency light is focused. Then the maximum kinetic energy of emitted electron is

AIIMS 2012 Structure of Atom

17. The metal oxide which cannot be reduced to metal by carbon is :

NEET 2013 General Principles and Processes of Isolation of Elements

18. The reagent with which both acetaldehyde and acetone readily react is

COMEDK 2005 Aldehydes Ketones and Carboxylic Acids

19. $\alpha$-Particles can be detected by using

AIIMS 2005 Structure of Atom

20. 1.5 g of $CdCl_2$ was found to contain 0.9 g of Cd.
Calculate the atomic weight of Cd

EAMCET 2009 Some Basic Concepts of Chemistry

21. In acidic medium, which of the following becomes colourless?

AIIMS 2018 The d-and f-Block Elements

22. A gas bulb is filled with $NO_2$ gas and immersed in an ice bath at 0$^\circ$C which becomes colourless after , sometime. This colourless gas will be

Madhya Pradesh PMT 2002 Equilibrium

23. The state of hybrid orbitals of carbon in $\ce{CO_2, CH_4}$ and $\ce{CO^{2-}_3}$ respectively is

KCET 2018 Chemical Bonding and Molecular Structure

24. Assertion : Co(IV) is known but Ni(IV) is not.
Reason : Ni(IV) has $d^4$ electronic configuration.

AIIMS 2014 The d-and f-Block Elements

25. The most important chemical method to
resolve a racemic mixture makes use of the
formation of

AIPMT 1994 Organic Chemistry – Some Basic Principles and Techniques

26. 75% of first order reaction is complete in 30 minutes. What is the time required for 99.9% of the reaction (in minutes) ?

KCET 2001 Chemical Kinetics

27. Out of the below two compounds, the vapour pressure of $B$ at a particular temperature is

KCET 2011 Alcohols Phenols and Ethers

28. The electron was shown experimentally to have wave properties by

AIPMT 1994 Structure of Atom

29. $\frac{K_{p}}{K_{c}}$ for following reaction will be
$\quad\quad$$CO_{\left(g\right)}+\frac{1}{2}O_{2\left(g\right)}\rightarrow CO_{2\left(g\right)}$

AIIMS 2012 Equilibrium

30. Which of the following represents the Lewis structure of $N_2$ molecule ?

KCET 2006 Chemical Bonding and Molecular Structure

Chemistry Questions