Class/Course - Engineering Entrance

Subject - Chemistry

Total Number of Question/s - 3121

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  • 1. Some Basic Concepts of Chemistry - Quiz

    1. A gaseous hydrocarbon gives upon combustion, 0.72 g of water and 3.08 g of CO2. The empirical formula of the hydrocarbon is:
    a) C2H4
    b) C3H4
    c) C6H5
    d) C7H8

    2. The density of a solution prepared by dissolving 120g of urea (mol. Mass = 60 u ) in 1000g of water is 1.15 g/mL. The molarity of this solution is:
    a) 0.50 M
    b) 1.78 M
    c) 1.02 M
    d) 2.05 M

  • 2. States of Matter - Quiz

    1. The edge length of a face centered cubic cell of an ionic substance is 508 pm. If the radius of cation is 110 pm, the radius of the anion is
    a) 288 pm
    b) 398 pm
    c) 618 pm
    d) 144 pm

    2. Which one of the following statements is not true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?
    a) The area under the distribution curve remains the same as under the lower temperature
    b) The distribution becomes broader
    c) The fraction of the molecules with the most probable speed increases
    d) The most probable speed increases

  • 3. Atomic Structure - Quiz

    1. Which one of the following sets of ionic represents the collection of isoelectronic species?
    (Atomic numbers of F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19 , Ca = 20 , Sc = 21)
    a) K+ , Ca2+ , Sc3+ , Cl-
    b) Na+ , Ca2+ , Sc3+ , F-
    c) K+ , Cl- , Mg2+ , Sc3+
    d) Na+ , Mg2+ , Al3+ , Cl-

    2. The de-Broglie wavelength of a tennis ball of mass 60g moving with a velocity o 10 m/s is approximately
    (Plancks constant , h = 6.63 × 10-34 Js)
    a) 10-33 m
    b) 10-31 m
    c) 10-16 m
    d) 10-25 m

  • 4. Chemical Bonding - Quiz

    1. The number of types of bonds between two carbon atoms in calcium carbide is
    a) one sigma, two pi
    b) one sigma, one pi
    c) two sigma, one pi
    d) two sigma, two pi

    2. The bond order in NO is 2.5 while that in NO+ is 3. Which of the following statements is true for these two species?
    a) Bond length in NO+ is greater than in NO
    b) Bond length in NO is greater than in NO+
    c) Bond length in NO+ is equal to that in NO
    d) Bond length is unpredictable

  • 5. Thermodynamics - Quiz

    1. The enthalpy changes for the following process are listed below
    $Cl_{2}\left (g \right )$ = $2Cl\left (g \right ), 242.3 \ kJ \ mol^{-1}$
    I2(g) = 2I(g), 151.0 kJ mol-1
    ICI (g) = I(g) + Cl(g) , 211.3 kJ mol-1
    I2S = I2 (g), 62.76 kJ mol-1
    Given that the standard states for iodine and chlorine are I2 (s) and Cl2 (g), the standard enthalphy of formation of ICI (g) is
    a) -14.6 kJ mol-1
    b) -16.8 kJ mol-1
    c) +16.8 kJ mol-1
    d) +244.8 kJ mol-1

    2. The correct relationship between free energy change in a reaction and the corresponding rquilibrium constant K is
    a) ΔG = RT ln Kc
    b) -ΔG = RT ln Kc
    c) ΔG0 = RT ln Kc
    d) -ΔG0 = RT ln Kc

  • 6. Solutions - Quiz

    1. A 5% solution of cane sugar (molar mass = 342) is isotonic with 1% of a solution of an unknown solute. The molar mass of unknown solute in g/mol is
    a) 136.2
    b) 171.2
    c) 68.4
    d) 34.2

    2. Equal masses of methane and oxygen are mixed in an empty container at 250 C. the fraction of the total pressure exerted by oxygen is
    a) $\frac{2}{3}$
    b) $\frac{1}{3} \times \frac{273}{298}$
    c) $\frac{1}{3}$
    d) $\frac{1}{2}$

  • 7. Equilibrium - Quiz

    1. At 250C, the solubility product of Mg(OH)2 is 1.0 x 10-11 . At which pH, will Mg2+ ions start precipitating in the form of Mg(OH)2 from a solution of 0.001 M Mg2+ ions?
    a) 9
    b) 10
    c) 11
    d) 8

    2. pH of 0.005 M calcium acetate (pKa of CH3COOH = 4.74) is
    a) 7.04
    b) 9.37
    c) 9.26
    d) 8.34

  • 8. Redox Reactions and Electrochemistry - Quiz

    1. The reduction potential of hydrogen half-cell will be negative if
    a) p(H2) = 1 atm and [H+] = 2.0 M
    b) p(H2) = 1 atm and [H+] = 1.0 M
    c) p(H2) = 2 atm and [H+] = 1.0 M
    d) p(H2) = 2atm and [H+] = 2.0 M

    2. In a cell that utilises the reaction
    Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)
    addition of H2SO4 to cathode compartment will
    a) lower the E and shift equilibrium to the left
    b) lower the E and shift equilibrium to the right
    c) increase the E and shift the equilibrium to the right
    d) increase the E and shift the equilibrium to the left

  • 9. Chemical Kinetics and Surface Chemistry - Quiz

    1. For a first order reaction , (A) → products the concentration of A changes from 0.1 M to 0.025 M in 40 min. The rate of reaction when the concentration of A is 0.01 M is
    a) 1.73 x 10-5 M/min
    b) 3.47 x 10-4 M/min
    c) 3.47 x 10-5 M/min
    d) 1.73 x 10-4 M/min

    2. The half-life period of a first order chemical reaction is 6.93 min. The time required for the completion of 99% of the chemical reaction will be (log2 = 0.301)
    a) 230.3 min
    b) 23.03 min
    c) 46.06 min
    d) 460.6 min

  • 10. Periodicity of Elements - Quiz

    1. The correct order of electron gain enthalpy with negative sign of F, Cl, Br and L having atomic number 9,17, 35 and 53 respectively is
    a) I > Br > Cl > F
    b) F > Cl > Br > I
    c) Cl > F > Br > I
    d) Br > Cl > I > F

    2. Based on lattice energy and other consideration which one of the following alkali metal chlorides is expected to have the highest melting point?
    a) RbCl
    b) KCl
    c) NaCl
    d) LiCl

  • 11. Principles and Processes of Metallurgy - Quiz

    1. Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?
    a) Metal sulphides are thermodyamically more stable than CS2
    b) CO2 is thermodynamically more stable than CS2
    c) Metal sulphides are less stable than the corresponding oxides
    d) CO2 is more volatile than CS2

    2. Which one of the following ores is best concentrated by froth-floatation method?
    a) magnetite
    b) Cassiterite
    c) Galena
    d) Malachite

  • 12. Hydrogen, s and p-Block Elements - Quiz

    1. PCl3 and PCl5 both exist; NCl3 exists but NCl5 does not exist. It is due to
    a) lower electronegativity of P than N
    b) lower tendency of N to form covalent bond
    c) availability of vacant d-orbital in P but not in N
    d) statement is itself incorrect

    2. Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is
    a) R4Si
    b) R SiCl3
    c) R2SiCl2
    d) R3SiCl

  • 13. d- and f-Block Elements and Coordination Chemistry - Quiz

    1. What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?
    a) $Cr^{3+} \ and \ Cr_{2}O_{7}^{2-}$ are formed
    b) $Cr_{2}O_{7}^{2-} \ and \ H _{2}O$ are formed
    c) $Cr_{2}O_{7}^{2-}$ is reduce to +3 state of Cr
    d) None of the above

    2. Which one of the following statements is correct?
    a) Manganese salts give a violet borax bead test in the reducing flame
    b) From a mixed precipitate of AgCl and Agl, ammonia solution dissolves only AgCl
    c) Ferric ions give a deep green precipitate on adding potassium ferrocyanide solution
    d) On boiling a solution having K+, Ca2+ and $HCO_{3}^{-}$ ions, we het a precipitate of $K_{2}Ca(CO_{3})_{2}$

  • 14. Environmental Chemistry - Quiz

    1. Identify the incorrect statement from the following
    a) Oxides of nitrogen in the atmosphere can cause the depletion of ozone layer
    b) Ozone absorbs the intense ultraviolet radiations of the sun
    c) Depletion of ozone layer is because of its chemical reactions with chlorofluoro alkenes
    d) Ozone absorbs infrared radiations

    2. When rain is accompanied by a thunderstorm, the collected rain water will have a pH value
    a) slightly lower than that of rain water without thunderstorm
    b) slightly higher than that when the thunderstorm is not there
    c) unifluenced by occurrence of thunderstorm
    d) which depends on the amount of dust in air

  • 15. General Organic Chemistry - Quiz

    1. Due to the presence of an unpaired electron, free radicals are
    a) cations
    b) anions
    c) chemically inactive
    d) chemically reactive

    2. The reaction

    is fastest when X is
    a) OCOR
    b) OC2H5
    c) NH2
    d) Cl

  • 16. Hydrocarbons and their Halogen Derivatives - Quiz

    1. Presence of a nitro group in a benzene ring
    a) activates the ring towards electrophilic substitution
    b) renders the ring basic
    c) deactivates the ring towards nucleophilic substitution
    d) deactivates the ring towards electrophilic substitution

    2. Ozonolysis of an organic compound A produces and propionaldehyde in equimolar mixture. Identify A form the following compounds.
    a) 2-methyl-1-pentene
    b) 1-pentene
    c) 2-pentene
    d) 2-methyl-2-pentene

  • 17. Organic Compounds Containing Oxygen - Quiz

    1. On vigorous oxidation by permangnate solution
    (CH3)2C=CHCH2CHO gives
    a) (CH3)2CO and OHCCH2CHO
    c) (CH3)2CO and OHCCH2COOH
    d) (CH3)2CO and CH2(COOH)2

    2. The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is
    a) benzoic acid
    b) salicylaldehyde
    c) salicyclic acid
    d) phthalic acid

  • 18. Organic Compounds Containing Nitrogen - Quiz

    1. In the chemical reaction

    . compounds A and B respectively are
    a) flurobenzene and phenol
    b) benzene diazonium chloride and benzoniyrile
    c) nitrobenzene and chlorobenzene
    d) phenol and bromobenzene

    2. Wich of the following is the strongest base?

  • 19. Polymers and Biomolecules - Quiz

    1. The secondary structure of a protein refers to
    a) α-helical backbone
    b) hydrophobic interactions
    c) sequence of α-amino acids
    d) fixed configuration of the polypeptide backbone

    2. Complete hydrolysis of cellulose gives
    a) D-fructose
    b) D-ribose
    c) D-glucose
    d) L-glucose

  • 20. Analytical Chemistry and Chemistry in Everyday Life - Quiz

    1. Which of the following could act as a propellant for rockets?
    a) Liquid hydrogen + liquid nitrogen
    b) Liquid oxygen + liquid argon
    c) Liquid hydrogen + liquid oxygen
    d) Liquid nitrogen + liquid oxygen

    2. For the estimation of nitrogen , 1.4 g of an organic compound was digested by kjeldahls method and the evolved ammonia was absorbed in 6 mL of $\frac{M}{10}$ sulphuric acid .The unreacted acid required 20 mL of $\frac{M}{10}$ sodium hydroxide for the complete neutralization .The percentage of nitrogen in the compound is
    a) 6%
    b) 10%
    c) 3%
    d) 5%