Total Number of Question/s - 6390

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  • 1. Some Basic Concepts of Chemistry - Quiz


    SAMPLE QUESTIONS


    1. Which of the following statements is correct about the reaction given below:
    4Fe(s) + 3O2(g) →2 Fe O3(s)
    a) Total mass of iron and oxygen in reactants = total mass of iron and oxygen in product therefore it follows law of conservation of mass:
    b) Total mass of reactants = tota mass of product ; therefore, law of multiple proportions is followed.
    c) Amount of Fe2O3 can be increased by taking one of the reactants (iron or oxygen) in excess
    d) Amount of Fe2O3 produced will decrease if the amount of any one of the reactants (iron or oxygen ) is taken in excess.

    2. Which of the following reactions is not correct according to the law of conservation of mass.
    a) 2 Mg (s) + O2(g) → 2 MgO (s)
    b) C3Hg(g) + O2 (g) → CO2(g) + H2 O(g)
    c) P4(s) + 5 O2 (g) → P4O10(s)
    d) CH4(g) + 2O2 (g) → CO2(g) + 2H2 O(g)

  • 2. Structure of Atom - Quiz


    SAMPLE QUESTIONS


    1. The angular momentum of an electron in 4s orbital, 3p orbital, and 4th orbit are
    a) $0,\frac{1}{\sqrt{2}} \frac{h}{\pi}, \frac{2h}{\pi}$
    b) $\frac{1}{\sqrt{2}} \frac{h}{\pi}, \frac{2h}{\pi},0$
    c) $0,\frac{\sqrt{2}h}{\pi}, \frac{4h}{\pi}$
    d) $\frac{\sqrt{2}h}{\pi}, \frac{4h}{\pi},0$

    2. The de Broglie wavelength of a ball of mass 10 g moving with a velocity of 10 m s-1 is ( h = 6.626 x 10-34 Js)
    a) 6.626 x 10-33 m
    b) 6.626 x 10-29 m
    c) 6.626 x 10-31 m
    d) 6.626 x 10-36 m

  • 3. Classification of Elements and Periodicity in Properties - Quiz


    SAMPLE QUESTIONS


    1. Atoms of the elements belonging to the same group of periodic table will have
    a) Same number of protons
    b) Same number of electrons in the valence shell
    c) Same number of neutrons
    d) Same number of electrons

    2. Which of the following transitions involved maximum amount of energy?
    a) M- (g) →M(g)
    b) M(g) → M- (g)
    c) M+ (g) →M2 + (g)
    d) M2+ (g) → M3+ (g)

  • 4. Chemical Bonding and Molecular Structure - Quiz


    SAMPLE QUESTIONS


    1. The species in which the central atom uses sp2 hybrid orbitals in its bonding is
    a) PH3
    b) NH3
    c) CH3+
    d) SbH3

    2. Which of the following species has a linear shape?
    a) NO2+
    b) O3
    c) NO-2
    d) SO2

  • 5. States of Matter - Quiz


    SAMPLE QUESTIONS


    1. Select the correct statement.
    I. Greater is humidity, lesser will be rate of evaporation of water.
    II. Greater is the humidity , lesser will be density of air.
    III. If room temperature = dew point, relative humidity = 100%
    IV. Dew point is the temperature at which the gas a given atmospheric condition becomes saturated with H2O (v)
    a) I,II
    b) II,IV
    c) All
    d) None

    2. If vrms is 30 R1/2 at C0C, then the molar mass of the gas in kilogram is
    a) 1
    b) 2
    c) 4
    d) 0.001

  • 6. Thermodynamics - Quiz


    SAMPLE QUESTIONS


    1.
    boiling point = 50K. What is the boiling point at 10 atm
    a) 150 K
    b) 75 K
    c) 100 K
    d) None is correct

    2. The values of ΔH and ΔS for the reaction C(graphite) + CO2 (g) → 2CO(g) are 170 kJ and 170 JK-1 respectively. This reaction will be spontaneous at
    a) 910 K
    b) 1110 K
    c) 510 K
    d) 710 K

  • 7. Equilibrium - Quiz


    SAMPLE QUESTIONS


    1. According to Law of Mass Action, the rate at which a substances reacts is proportional to is _________,
    a) Inactive Mass or Molal concentration
    b) Mass or concentration
    c) Active Mass or Molar concentration
    d) None of the above

    2. Among the following hydroxides, the one which has the lowest value of Ksp at ordinary temperature (about 250C) is
    a) Mg(OH)2
    b) Ca (OH)2
    c) Ba (OH)2
    d) Be(OH)2

  • 8. Redox Reactions - Quiz


    SAMPLE QUESTIONS


    1. In the chemical reaction,
    K2Cr2O7 + xH2SO4 + ySO2 → K2SO4 + Cr2(SO4)3 + zH2O
    x,y, and z are
    a) 1,3,1
    b) 4,1,4
    c) 3,2,3
    d) 2,1,2

    2. In the balanced chemical reaction
    $IO_{3}^{\circleddash } + aI^{\circleddash } \rightarrow cH_{2}O + dI_{2}$
    a,b,c and d, respectively, correspond to
    a) 5,6,3,3
    b) 5,3,6,3
    c) 3,5,3,6
    d) 5,6,5,5

  • 9. Hydrogen - Quiz


    SAMPLE QUESTIONS


    1. Given colourless liquid will be determined whether it is water or not?
    a) By smelling
    b) By tasting
    c) By phenolphthalein
    d) By adding a pinch of anyhydrous CuSO4

    2. Which of the following is correct for hydrogen?
    a) It can form bonds in +1 as well as -1 oxidation state
    b) It is collected at cathode
    c) It has a very high ionisation potential
    d) All of the above

  • 10. The s-Block Elements - Quiz


    SAMPLE QUESTIONS


    1. Lithium and Magnesium shows ________________.
    a) Diagonal relationship
    b) Linear relationship
    c) Amophoteric nature
    d) None of these

    2. When sodium is dissolved in liquid ammonia, a solution of deep blue colour is obtained. The colour of he solution is due to
    a) Ammoniated electron
    b) Sodium ion
    c) Sodium amide
    d) Ammoniated sodium ion

  • 11. The p-Block Elements - Quiz


    SAMPLE QUESTIONS


    1. What is not true about borax?
    a) Molecular formula is Na2B4O7. 10H2O.
    b) Crystallic borax contains tetranuclear unit of [B4O5(OH)4]2-
    c) It hydrolyses to give an acidic solution
    d) White crystalline solid

    2. Na2B4O7.10H2O is correctly represented as
    a) 2NaBO2.Na2B2O2.10H2O
    b) Na2B4O5(OH)4].8H2O
    c) Na2.B4(H2O)4O7].6H2O
    d) All of the above

  • 12. Organic Chemistry – Some Basic Principles and Techniques - Quiz


    SAMPLE QUESTIONS


    1. In the hydrocarbon,
    The state of hybridization of carbons 1, 3 and 5 are in the following sequence
    a) sp, sp2, sp3
    b) sp3, sp2, sp
    c) sp2, sp, sp3
    d) sp, sp3, sp2

    2. Which isomer of hexane has only two different sets of structurally equivalent hydrogen atoms?
    a) 2, 2-dimethylbutane
    b) 2-methylpentane
    c) 3-methylpentane
    d) 2, 3-dimethylbutane

  • 13. Hydrocarbons - Quiz


    SAMPLE QUESTIONS


    1. Kolbe electrolysis of ___________ produces n-hexane at anode.
    a) Sodium hexanoate
    b) Sodium butanoate
    c) Sodium methanoate
    d) None of these

    2. CH3―CH = CH2 + NOCI → P. Identify the adduct P
    a)
    b)
    c)
    d)

  • 14. Environmental Chemistry - Quiz


    SAMPLE QUESTIONS


    1. Earth protective umbrella existing in the stratosphere is known as___________.
    a) Chlorofluorocarbons
    b) Ozone
    c) Buckmisterfullerene
    d) None of these

    2. London smog is ____________in nature whereas photochemical smog is ___________in nature.
    a) Oxidizing , reducing
    b) Reducing, oxidizing
    c) acidic, basic
    d) None of these

  • 15. Chemical Equlibrium - Quiz


    SAMPLE QUESTIONS


    1. Inert gas has been added to the following equilibrium system at constant volume
    SO2(g) + 1/2O2(g) $\rightleftharpoons$ SO3(g)
    To which direction will the equilibrium shift?
    a) Forward
    b) Backward
    c) No effect
    d) Unpredictable

    2. In a chemical reaction, equilibrium is said to have been established when the
    a) Concentration of reactants and products are equal
    b) Opposing reaction ceases
    c) Velocities of opposing reaction become equal
    d) Temperature of opposing reaction are equal

  • 16. Ionic Equlibrium - Quiz


    SAMPLE QUESTIONS


    1. The best indicator for the detection of the end point in the titration of a weak acid and a strong base is
    a) Methyl orange (pH range 3 to 4)
    b) Methyl red (pH range 4 to 6)
    c) Thymol blue (pH range 8 to 3)
    d) Phenolphthalein (pH range 8 to 10)

    2. A solution of CaF2 is found to contain 4 x 10-4M of $F^{\circleddash}$ ions. Ksp of CaF2 is
    a) 3.2 x 10-11
    b) 0.8 x 10-11
    c) 6.4 x 10-11
    d) 32 x 10-11

  • 17. Alkanes and Cycloalkanes - Quiz


    SAMPLE QUESTIONS


    1. The structure of alkane or cycloalkane with molecular formuls C8H18 that has only 10H atoms is :
    a) 2,2,3,3-Tetramethylbutane
    b) 2,2,3-Trimethylpentane
    c) 2,2,4-Trimethylpentane
    d) 2,3,3-Trimethylpentane

    2. Methyl bromide is converted into ethane by heating it in ether medium with:
    a) Zn
    b) Cu
    c) Na
    d) Al

  • 18. Alkenes and Alkadienes - Quiz


    SAMPLE QUESTIONS


    1. Which statements is/are correct?
    i. In oxymercuration and demercuration reaction, the electrophile is $AcOHg^{\oplus}$
    ii. In this reaction, Hg+ is reduced to Hg0.
    iii. In this reaction, Hg2+ is reduced to Hg+
    iv. In this reaction , Hg2+ is reduced to Hg0.
    a) (i) and (iv)
    b) (i) and (ii)
    c) (i) and (iii)
    d) (iv)

    2.
    Compound (A) is :
    a)
    b)
    c)
    d)

  • 19. Alkynes - Quiz


    SAMPLE QUESTIONS


    1.
    The product (B) is:
    a)
    b)
    c)
    d)

    2. In the reaction , source of two H atoms which are added to alkyne to give trans-alkene is:
    a) NH3
    b) EtOH
    c) Et-NH2
    d) Both (a) and (c)

  • 20. s-Block Elements (Alkaline Earth Metal) - Quiz


    SAMPLE QUESTIONS


    1. NaOH is manufactured by the electrolysis of brine in a specially designed cell called
    a) Castner-Keliner cell
    b) Castner cell
    c) Solvay cell
    d) Leblanc cell

    2. Which of the following metal reacts with cold H2O with the evolution of H2 gas?
    a) Ca
    b) Al
    c) Zn
    d) Cu

  • 21. p-Block Group 14 (Carbon Family) - Quiz


    SAMPLE QUESTIONS


    1. Which of the following statement is false about carbon?
    a) C60 is laso one of the allotrope of carbon
    b) It has crystalline as well as amorphous allotropes
    c) It can form pπ-pπ bond with other C-atoms
    d) It cannot form pπ-pπ bond with atoms such as N and O

    2. The species present in solution when CO2 is dissolved in water are:
    a) H2CO3, CO32-
    b) HCO3$\circleddash$, CO32-
    c) CO2, H2CO3
    d) CO2, H2CO3, HCO3$\circleddash$, CO32-

  • 22. Classification & Nomenclature of Organic Compounds - Quiz


    SAMPLE QUESTIONS


    1. Which of the following statement is wrong for a homologus series?
    a) All members have a general formula.
    b) All members have the same functional group.
    c) All members have the same chemical properties.
    d) All members have the same physical properties

    2. The decreasing order of priority for the following functional groups is:
    I. -C$\equiv$N
    II. -CONH2
    III.
    IV. -CHO
    a) (II) > (I) > (IV) > (III)
    b) (III) > (IV) > (I) > (II)
    c) (I) > (II) > (IV) > (III)
    d) (I) > (II) > (III) > (IV)

  • 23. Quantitative & Qualitative Analysis - Quiz


    SAMPLE QUESTIONS


    1. An organic compound contains C = 40%, O = 53.5%, and H = 6.5%. The empirical formula of the compound is:
    a) CH2 O
    b) C2 H4 O
    c) C6 H12 O6
    d) C2 H4 O2

    2. The molecular mass of a compound having empirical formula C2 H5 O is 90. The molecular formula of the compound is:
    a) C6 H15 O3
    b) C4 H10 O2
    c) C2 H5 O
    d) C3 H6 O3

  • 24. Isomerism - Quiz


    SAMPLE QUESTIONS


    1. Which of the following alkenes is most stables?
    a) (CH3)2CH=CH2
    b) CH3CH=CHCH3
    c) (CH3)2C=C(CH3)2
    d) CH3CH=CH2

    2. The number of isomers of the compound CF2FClBrI is :
    a) 3
    b) 4
    c) 5
    d) 6

  • 25. General Organic Chemistry - Quiz


    SAMPLE QUESTIONS


    1. The decreasing nucleophilicity of the following is :
    I. $CH_{3}S^{\circleddash }$ II. $CH_{3}O^{\circleddash }$ III. IV. $EtO^{\circleddash }$
    a) IV > III > II > I
    b) I > II > III > IV
    c) IV > III > I > II
    d) II > I > III > IV

    2. The decreasing order of basic charcters of the following is :

    a) III < IV >< I > II
    b) II > I > IV > III
    c) IV > III > II > I
    d) I > II > III > IV

  • 26. Organic Reaction & Mechanism - Quiz


    SAMPLE QUESTIONS


    1. In which of the following reactions, retention of configuration takes place?
    (I)
    (II) (A) + COCl2
    (III) (A) + SOCl2 $\overset{Pyridine}{\rightarrow}$
    (IV) (A) + COCl2 $\overset{Pyridine}{\rightarrow}$
    a) (I),(III)
    b) (I),(II)
    c) (III),(IV)
    d) (I),(IV)

    2. Which statement is correct about the following reaction?

    a) Major product is (I) and minor product is (II) by SN1 mechanism.
    b) Major product is (I) and minor product is (II) by SN2 mechanism
    c) Major product is (II) and minor product is (I) by SN1 mechanism
    d) Major product is (II) and minor product is (I) by SN2 mechanism.