Total Number of Question/s - 6390

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  • 1. Some Basic Concepts of Chemistry - Quiz


    SAMPLE QUESTIONS


    1. Sucrose solution which is 40% by mass is heated till it becomes 50% by mass. Water lost from 100 g of the solution is
    a) 10 g
    b) 15 g
    c) 20 g
    d) 25 g

    2. An alkaloid contains 17.28% of nitrogen and its molecular mass is 162. The number of nitrogen atoms present in one molecule of the alkaloid is
    a) Five
    b) Four
    c) Three
    d) Two

  • 2. Structure of Atom - Quiz


    SAMPLE QUESTIONS


    1. If n = 6, the correct sequence of filling of electrons will be
    a) ns →np →(n-1) d → (n-2) f
    b) ns → (n-2) f → (n-1) d → np
    c) ns → (n-1) d → (n-2) f → np
    d) ns → (n-2) f → np → (n-1) d

    2. Planck constant has the units of
    a) Work
    b) Energy
    c) Angular momentum
    d) Linear momentum

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


    SAMPLE QUESTIONS


    1. Eka- aluminium and Eka-silicon are known as
    a) Gallium and germanium
    b) Aluminium and silicon
    c) Iron and sulphur
    d) Proton and silicon

    2. Decreasing order of bond angle of (NH3, , PCl5, SCl2) is
    a) NH3 > SCl2 > PCl5 >
    b) NH3 > SCl2 > >PCl5
    c) > NH3 > SCl2 > PCl5
    d) > NH3 > PCl5 > SCl2

  • 4. Chemical Bonding and Molecular Structure - Quiz


    SAMPLE QUESTIONS


    1. How many bonds are there in

    a) 14 σ, 8π
    b) 18 σ, 8π
    c) 19 σ, 4π
    d) 14 σ, 2π

    2. In BrF3 molecule, the lone pairs occupy equatorial position to minimize
    a) Lone pair ―bond pair repulsion only
    b) Bond pair ―bond pair repulsion only
    c) Lone pair ―lone pair repulsion and lone pair-bond pair repulsion
    d) Lone pair ―lone pair repulsion only

  • 5. States of Matter - Quiz


    SAMPLE QUESTIONS


    1. The rate of diffusion of a gas is directly proportional to the square root of___________.
    a) Temperature in farhenheit
    b) Temperature in degree Celcius
    c) Temperature in K
    d) None of the above

    2. 3.2g oxygen is diffused in 10 min. In similar condition 2.8g nitrogen will diffuse in
    a) 9.3 min
    b) 8.2 min
    c) 7.6 min
    d) 11.8 min

  • 6. Thermodynamics - Quiz


    SAMPLE QUESTIONS


    1. For the process H2O (l) )(1 bar, 374 K)→ H2O (g) (1 bar, 373 K) , the correct sot of thermodynamic parameters is
    a) ΔG = 0 , ΔS = + ve
    b) ΔG = 0, ΔS = - ve
    c) ΔG = + ve, ΔS = 0
    d) ΔG = - ve , ΔS = + ve

    2. Consider the following reactions
    (i) H+(aq) + OH-(aq) = H2O(l)                         -x1 kJ mol-1
    (ii) H2(g) + $\frac{1}{2}$O2(g) = H2O (l)            x2 kJ mol-1
    (iii) CO2(g)+ H2(g) = CO(g) +H2O(l)               -x3 kJ mol-1
    (iv) C2H2 (g) + $\frac{5}{2}$O2 (g) + H2O (l)     +x4 kJ mol-1
    Enthalpy of formation of H2O (l) is
    a) -x2 kJ mol-1
    b) +x3 kJ mol-1
    c) -x4 kJ mol-1
    d) +x1 kJ mol-1

  • 7. Equilibrium - Quiz


    SAMPLE QUESTIONS


    1. Given :
    2 N2O (g) 2 N2 (g) + O2 (g), K = 3.5 x 1033
    2 NO2 (g) N2 (g) + 2 O2 (g) , K = 2.2 x 1016
    2 NO (g) N2 + O2 (g) , K = 2.2 x 1030
    2 N2O5 2 N2 (g) + 5 O2 (g), K = 1.2 x 1034
    Which oxide of nitrogen is most stable?
    a) N2O
    b) NO2
    c) NO
    d) N2O5

    2. If acid is added to water, ionic product of water increases.
    a) True
    b) False

  • 8. Redox Reactions - Quiz


    SAMPLE QUESTIONS


    1. The oxidation state of chromium in [Cr(PPh3)3(CO)3] is
    a) +3
    b) +8
    c) 0
    d) +5

    2. 3.92 g of ferrous ammonium sulphate are dissolved in 100 ml water. 20 ml of this solution requires 18 ml of potassium permanganate during titration for complete oxidation. The weight of KMnO4 present in one litre of the solution is
    a) 34.76 g
    b) 12.38 g
    c) 1.238 g
    d) 3.476 g

  • 9. Hydrogen - Quiz


    SAMPLE QUESTIONS


    1. The hydride ion $H^{\circleddash}$ is a stronger base than hydroxide ion. Which of the following reaction would occur if NaH is dissolved in water
    a) H(aq) + H2O(l) → H3O (aq)
    b)
    c) H + H2O → No reaction
    d) none of the above

    2. Hydrogen combines with other elements by
    a) Losing an electron
    b) Gaining an electron
    c) Sharing an electron
    d) Losing gaining and sharing of an electron

  • 10. The s-Block Elements - Quiz


    SAMPLE QUESTIONS


    1. A chemical A is used for the preparation of washing soda to recover ammonia. When CO2 is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to its disinfectant nature. What is the chemical formula of A?
    a) Ca(HCO3)2
    b) CaO
    c) Ca(OH)2
    d) CaCO3

    2. KO2 (potassium superoxide) is used in oxygen cylinders in space and submarines because it
    a) Absorbs CO2 and increases O2 content
    b) Eliminates moisture
    c) Absorbs CO2
    d) Produce ozone

  • 11. The p-Block Elements - Quiz


    SAMPLE QUESTIONS


    1. Which of the following statements about buckyball is incorrect?
    a) It is C60 allotrope of carbon
    b) All the carbon atoms are sp2-hybridized
    c) It contains 20 six-membered rings and 12 five-membered rings.
    d) Five membered rings are connected both to five and six-membered rings.

    2. N(SiH3)3 is more basic than N(CH3)3).
    a) Tru
    b) Fals

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


    SAMPLE QUESTIONS


    1. Which of the following compounds gives blood red colouration when its Lassaigne extract is treated with alkali and ferric chloride?
    a) Thiourea
    b) Diphenyl sulphide
    c) Phenylhydrazine
    d) Benzamide

    2. Consider the following carbocations.

    The stability sequence follows the order :
    a) (iv) < (i) < (ii) < (iii)
    b) (i) < (ii) < (iii) < (iv)
    c) (iv) < (i) < (iii) < (ii)
    d) (iv) < (ii) < (i) < (iii)

  • 13. Hydrocarbons - Quiz


    SAMPLE QUESTIONS


    1. Which of the following is not aromatic?
    a) Cyclopentadienyl anion
    b) Cycloheptatrienyl cation
    c) Cycloctatetraene
    d) Thiophene

    2. Among the following, the alkene on ozonolysis giving rise to only one aldehyde as the product is
    a) 1-Butene
    b) Propene
    c) 2-Butene
    d) 2-Methylprop-1-ene

  • 14. Environmental Chemistry - Quiz


    SAMPLE QUESTIONS


    1. Formation of London smog is initiated by a mixture of ________, __________________ and ________and is formed in the _________season.
    a) No2, particulars, high humidity, summer
    b) So2, particulars, high humidity, winter
    c) Co2, particulars, low humidity, summer
    d) None of these

    2. The threshold limit value of CO in the air is nearly_____________whereas that of CO2 is nearly________.
    a) 5000 ppm, 40 ppm
    b) 40 ppm, 5000 ppm
    c) 500 ppm, 400 ppm
    d) None of these

  • 15. Chemical Equlibrium - Quiz


    SAMPLE QUESTIONS


    1. In which of the following reaction, the yield of the products does not increase by increase in the pressure?
    a) N2(g) + O2(g) = 2NO(g)
    b) 2SO2(g) + O2(g) = 2SO3(g)
    c) N2(g) + 3H2(g) = 2NH3(g)
    d) PCl3(g) + Cl2(g) = PCl5

    2. The equilibrium constant K for the reaction 2HI(g) $\rightleftharpoons$ H2(g) + I2(g) at room temperature is 2.85 and that at 698 K is 1.4 x 10-2. This implies
    a) HI is exothermic compound
    b) HI is very stable at room temperature
    c) HI is relatively less stable than H2 and I2
    d) HI is resonance stabilised

  • 16. Ionic Equlibrium - Quiz


    SAMPLE QUESTIONS


    1. 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

    2. Fear or excitement, generally cause on to breathe rapidly and it results in the decrease of CO2 concentration in blood. In what way will it change the pH of blood?
    a) pH will increase
    b) pH will decrease
    c) No change
    d) pH will adjust to 7

  • 17. Alkanes and Cycloalkanes - Quiz


    SAMPLE QUESTIONS


    1. The total number of isomers including stereisomers for 1,2-Dimethyl cyclobutane is :
    a) 2 , one cis and one trans (both optically inactive)
    b) 3, one cis and two optically active trans form
    c) 3, one trans and two optically active cis forms
    d) 4, two cis (optically active) and two trans (optically active_

    2. Which of the statements is/are true about the reactivity of halogenation of alkanes? The reactivity order is F2 > Cl2 > Br2 > I2.
    Lower the activation energy for the chain initiation step, more reactive is the halogen.
    II. Lower the activation energy for the first chain propagation step, more reactive is the halogen.
    III. More negative is the overall herat of the reaction (ΔHr0) of halogenation of alkane, more reactive is the halogen.
    IV. Lower the activation energy for the second chain-propagation step, more reactive is the halogen
    a) (I),(II),(III)
    b) (I),(III)
    c) (II),(III),(IV)

  • 18. Alkenes and Alkadienes - Quiz


    SAMPLE QUESTIONS


    1. Which of the following is the correct order of stability of the following compounds?

    a) (I) > (II) > (III)
    b) (III) > (II) > (I)
    c) (II) > (I) > (III)
    d) (I) > (III) > (II)

    2. Compound (A)(C5H10) does not dissolve in cold conc. H2SO4 . What is (A)?
    a)
    b)
    c)
    d)

  • 19. Alkynes - Quiz


    SAMPLE QUESTIONS


    1.
    A, B and C are :
    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. Beryllium shows diagonal relationship with
    a) Mg
    b) Na
    c) Al
    d) B

    2. The reaction that takes place when Cl2 gas is passed through conc NaOH solution is
    a) Oxidation
    b) Reduction
    c) Displacement
    d) Disproportionation

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


    SAMPLE QUESTIONS


    1. The structure and hybridisation of Si(CH3)4 is:
    a) Bent, sp
    b) Trigonal,sp2
    c) Octahedral, sp3d2
    d) Tetrahedral, sp3

    2. Different forms of silica such as quartz, tridymite and cristobalite are as follows:

    The structure possessed in them is:
    a) Sheet silicate
    b) Three-dimensional silicate
    c) Chain silicate
    d) Cyclic or ring silicate

  • 22. Classification & Nomenclature of Organic Compounds - Quiz


    SAMPLE QUESTIONS


    1. Which of the following is pyrogallol?
    a)
    b)
    c)
    d)

    2. In 3-chloro cyclohexanol the primary prefix is:
    a) 3-Chloro
    b) Cyclo
    c) an(e)
    d) -ol

  • 23. Quantitative & Qualitative Analysis - Quiz


    SAMPLE QUESTIONS


    1. Ten millilitre of a gaseous hydrocarbon was burnt completely in 80 ml of O2 at STP. The volume of the remaining gas is 70 ml. The volume became 50 ml on treatment with NaOH. The formula of the hydro-carbon is:
    a) C2 H6
    b) C2 H6
    c) C3 H8
    d) C3 H6

    2. A compound which does not give a positive test in Lassaignes test for nitrogen is:
    a) Glycine
    b) Hydrazine
    c) Urea
    d) Phenyl hydrazine

  • 24. Isomerism - Quiz


    SAMPLE QUESTIONS


    1. The smallest aldehyde and its next homologue are treated with NH2OH to form oxime. Find out the correct answer out of the following
    a) Two different oximes are formed
    b) Three different oximes are formed
    c) Two oximes are optically active
    d) All oximes are optically active

    2. The process of separation of racemic modifications into d and l enantiomers is called:
    a) Resolution
    b) Dehydration
    c) Revolution
    d) Dehydrohalogenation

  • 25. General Organic Chemistry - Quiz


    SAMPLE QUESTIONS


    1. The increasing order of pKb value of the following is:

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

    2. The decreasing order of acidic character of the following is :
    I. CH3SH II. CH3OH III. H2O IV. EtOH
    a) I > II > III > IV
    b) IV > III > II > I
    c) I > III > II > IV
    d) III > I > II > IV

  • 26. Organic Reaction & Mechanism - Quiz


    SAMPLE QUESTIONS


    1. Which of the following compounds would undergo Diels-Alder reaction with dienophile (e.g., Maleic anhydride?
    a) $HC \equiv C - \equiv CH$
    b)
    c)
    d)

    2. Which of the following reaction will not give Hofmann alkene?
    a)
    b)
    c)
    d) All