## 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

## 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