1. Which of the following best describes the diagram below of a molecular orbital ?

JEE Main 2018 Chemical Bonding and Molecular Structure

2. Glutaric acid is

KEAM 2015 Aldehydes Ketones and Carboxylic Acids

3. Which one of the following ores is best concentrated by froth-flotation method ?

JEE Main 2016 General Principles and Processes of Isolation of Elements

4. The rate equation of a gaseous reaction is given by, $r = k[A][B]$. If the volume of reaction vessel is suddenly reduced to half of the initial volume, the reaction rate relating to the original rate will be

COMEDK 2012 Chemical Kinetics

5. The inversion of cane sugar is first order in [sugar] and proceeds with half-life of 600 minutes at pH = 4 for a given concentration of sugar. However, if pH = 5, the half-life changes to 60 minutes. The rate law expression for the sugar inversion can be written as

KEAM 2014 Chemical Kinetics

6. Which of the following statements is correct for the spontaneous adsorption of a gas?

AIPMT 2014 Thermodynamics

7. 1-Butyne reacts with cold alkaline KMnO4 to produce

AIIMS 1997 Aldehydes Ketones and Carboxylic Acids

8. Assertion : Spontaneous process is an irreversible process and may be reversed by some external agency. Reason : Decrease in enthalpy is a contributory factor for spontaneity.

AIIMS 2017 Thermodynamics

9. Which of the following pairs of d-orbitals will have electron density along the axes?

NEET 2016 Structure of Atom

10. Gold is extracted by hydrometallurgical process, based on its property_______

KCET 2005 General Principles and Processes of Isolation of Elements

JIPMER 2014 Polymers

12. If n = 2 for $He^+$ ion than find out the wave length

AIIMS 2019 Structure of Atom

13. Which of the noble gas has highest polarizability

AFMC 2001 The p-Block Elements - Part2

14. Increasing order of acid strength among p-methoxyphenol, p-methylphenol and p-nitrophenol is

AIPMT 1993 Alcohols Phenols and Ethers

15. Metal ion responsible for the Minamata disease is

WBJEE 2014 The d-and f-Block Elements

16. Reduction of the lactol S with sodium borohydride gives

WBJEE 2017 Alcohols Phenols and Ethers

17. The compound that is most difficult to protonate is:

NEET 2019 Alcohols Phenols and Ethers

18. Among the following orbital bonds, the angle is minimum between

AIPMT 1994 Chemical Bonding and Molecular Structure

19. The pH of $\ce{0.5 \, M \, H_2 SO_4}$ is

COMEDK 2008 Equilibrium

21. Identify the incorrect statements, regarding the molecule $XeO_4$ :

NEET 2013 The p-Block Elements - Part2

NEET 2019 Amines

23. Which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon?

IIT JEE 1984 Structure of Atom

24. Match the compounds given in column I with the hybridisation and shape given in column II and mark the correct option. Column 1 Column 2 (a) $XeF_6$ (i) distorted octahedral (b) $XeO_3$ (ii) square planar (c) $XeOF_4$ (iii) pyramidal (d) $XeF_4$ (iv) square pyramidal

NEET 2019 The p-Block Elements - Part2

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

AIIMS 2018 The d-and f-Block Elements

26. The precipitate of C$aF_2, \, ( K_{sp} = 1.7 \times 10^{ - 10 } )$ is obtained, when equal volumes of which of the following are mixed?

IIT JEE 1982 Equilibrium

27. Which of the following is a carbonate ore?

AIIMS 2005 General Principles and Processes of Isolation of Elements

28. When $\ce{CH3CH2CHCl2 }$ is treated with $\ce{NaNH_2}$, the product formed is

AIPMT 2002 Hydrocarbons

29. Excess of NaOH (aq) was added to 100 mL of $\ce{ FeCl_3}$ (aq) resulting into 2.14 g of $\ce{Fe(OH)_3}$. The molarity of $\ce{FeCl_3}$ (aq) is : (Given molar mass of $\ce{Fe = 56 \, g \, mol^{-1}}$ and molar mass of $\ce{Cl = 35.5 \, g \, mol^{-1}}$)

JEE Main 2017 Some Basic Concepts of Chemistry

30. The enzyme present in saliva is

Punjab PMET 2004 Biomolecules