Chemistry Quiz for Class 12

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Chemistry Quiz for Class 12 Instructions:

  • There will be 30 multiple choice questions in this Quiz.
  • Answers to the questions will change randomly each time you start this Quiz.
  • Practice this Quiz at least three times to secure High Marks.
  • You can see your scores and ratings at the end of the Quiz.
  • If you found any incorrect answers in the Quiz, click on the quiz title and comment on that MCQ so our team can update the incorrect answer on time.

  • Question of

    The ion which has the highest magnetic moment is ______.

    • Fe+3
    • V+2
    • Sc+3
    • Cr+4
  • Question of

    The following compounds are paramagnetic and colored, except ______.

    • ScCl3
    • CuCl2
    • CoCl2
    • FeCl3
  • Question of

    In the following figure, the substance that causes the greatest movement in the indicator of the sensitive balance when put in the tube is ______.

    • Mn2+
    • Fe2+
    • V2+
    • Cr3+
  • Question of

    The following elements are arranged according to chemical activity Iron Copper Silver Platinum If you knew that the element scandium replaces hydrogen of water vigorously, what is its occupying place in the previous arrangement?

    • Before iron
    • After silver
    • Between iron and copper
    • After copper
  • Question of

    If you have two solutions, one of them contains V3+ ions and the other contains Zn2+ ions. Which of those solutions is colorless? [ V3+- Zn2+] And the scientific reason behind this is that ______ [all of its d-electrons are unpaired-all of its d-electrons are paired]

    • Zn2+, all of its d-electrons are paired
    • V3+ ,all of its d-electrons are unpaired
    • Zn2+, all of its d-electrons are unpaired
    • V3+ ,all of its d-electrons are paired
  • Question of

    When d-sublevel contains eight electrons, the number of half-filled orbitals equals ______.

    • 2
    • 1
    • 3
    • 4
  • Question of

    What is the name of the element or compound used in detecting of some industrials flaws as cracks in welded locations?

    • Cobalt-60
    • Vanadium pentoxide
    • Copper
    • Copper (II) sulphate
  • Question of

    An element belongs to the first transition series, it’s magnetic moment in X2O3 compound equals 3, deduce the atomic number of this element.

    • 24
    • 25
    • 26
    • 27
  • Question of

    Magnetic moment is ______.

    • the tendency of an element to be attracted to an external magnet
    • determined by the number of unpaired electrons in the 3d sublevel
    • both
    • none of these
  • Question of

    All of the transition metals are characterized by ______.

    • electric conductivity
    • forming colored solutions
    • several oxidation states
    • ability to be magnetized
  • Question of

    Which one of the following is non-crystalline or amorphous?

    • Glass
    • Diamond
    • Common Salt
    • Graphite
  • Question of

    Mole fraction of glycerine C3H5(OH)3 in solution containing 36 g of water and 46 g of glycerine is?

    • 0.20
    • 0.40
    • 0.46
    • 0.36
  • Question of

    NH4NC>3 is used in salt bridge because?

    • The transport number of NH4+ and NO3– ions are almost equal.
    • It is a good conductor of electricity.
    • It is a weak electrolyte.
    • It forms a jelly like material with agar-agar.
  • Question of

    Which among the following is a false statement?

    • Molecularity of a reaction may be zero or fraction.
    • Half life of a third order reaction is inversely proportional to square of initial concentration of the reactant.
    • Rate of zero order reaction is independent of initial concentration of reactant.
    • For a first order reaction, t1/2=0.693/K
  • Question of

    According to adsorption theory of catalysis, the speed of the reaction increases because?

    • Adsorption lowers the activation energy of the reaction.
    • Adsorption produces heat which increases the speed of the reaction.
    • In the process of adsoption, the activation energy of the molecules becomes large.
    • The concentration of the reactant molecules at the active centres of the catalyst becomes high due to adsorption.
  • Question of

    The electrolytic reduction technique is used in the extraction of?

    • Highly electropostive elements.
    • Metalloids.
    • Transition metals.
    • Highly electronegative elements.
  • Question of

    H2S is more acidic than H2O because?

    • Atomic number of sulphur is higher than oxygen.
    • Oxygen is more electronegative than sulphur.
    • H — S bond dissociation energy is less as compared to H — O bond.
    • H — O bond dissociation energy is less also compared to H — S bond.
  • Question of

    Transistion metals, despite high E° oxidation, are poor reducing agents. The incorrect reason is?

    • Complex forming nature.
    • Low heats of hydration.
    • High ionization energies.
    • High heat of vaporization.
  • Question of

    Primary and secondary valency of Pt in [Pt(en)2Cl2] are?

    • 2, 6
    • 6, 4
    • 4, 6
    • 4, 4
  • Question of

    A dihalogen derivative ‘X’ of a hydrocarbon with three carbon atoms react with ale. KOH and produces hydrocarbon which forms red ppt. with ammonical Cu2Cl2. ‘X’ gives an aldehyde on reaction with aq. KOH. The compound ‘X’ is?

    • 1, 1-Dichloropropane
    • 2, 2-Dichloropropane
    • 1, 2-Dichloropropane
    • 1, 3-Dichloropropane
  • Question of

    The product ‘Z’ is

    • Benzoic acid
    • Benzaldehyde
    • Benzene
    • Toluene
  • Question of

    Which among the given molecules can exhibit tautomerism?

    • III only
    • Both I and III
    • Both I and II
    • Both II and III
  • Question of

    The compound ‘A’ is?

    • Ethane nitrile
    • Propane nitrile
    • Nitro methane
    • Methyl isocyanate
  • Question of

    The IUPAC name of ‘Y’ is?

    • N-methyl propan-2-amine
    • N-isopropyl methanamine
    • N-methyl propanamine
    • Butan-2-amine
  • Question of

    The compounds , n-butane and isobutane are best considered as:

    • Chain isomers
    • Positional isomers
    • Meta-mers
    • Functional group isomers
  • Question of

    Phenol react with acetyl chloride in the presence of a bas to form:

    • Ester
    • Citric acid
    • Alcohol
    • Acid
  • Question of

    The color of Iodoform is:

    • Yellow
    • Black
    • White
    • Blue
  • Question of

    What is the name of the following benzene derivative?

    • 4-Nitrobenzoic acid
    • 1,3-Dibromobenzene
    • 3-Chlorophenol
    • 3-Bromo-5-chloronitrobenzene
  • Question of

    What is the name of the following benzene derivative?

    • 3-Bromo-5-chloronitrobenzene
    • 1,2,3 Trimenthylbenzene
    • 1,3-Dibromobenzene
    • 2 Ethyltoluene
  • Question of

    What is the IUPAC name of the following structure of a compound ?

    • Pentanal
    • 3-pentanone
    • 1-phenyl-1-butanone
    • Butanedial

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