Total Number of Question/s - 3530

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  • 1. Some Basic Concepts of Chemistry - Quiz


    1. What is the weight of oxygen required for the complete combustion of 2.8kg of ethylene?
    a) 2.8 Kg
    b) 6.4Kg
    c) 9.6Kg
    d) 96Kg

    2. Assuming fully decomposed, the volume of CO2 released at STP on heating 9.85 g of BaCO3 (atomic mass, Ba = 137) will be
    a) 1.12 L
    b) 0.84 L
    c) 2.24 L
    d) 4.96 L

  • 2. Atomic Structure - Quiz


    1. The momentum of a particle having a de-Broglie wavelength of 10-17 m is
    a) 3.3125 × 10-7 kg ms-1
    b) 26.5 × 10-7 kg m s-1
    c) 6.625 × 10-17 kg m s-1
    d) 13.25 × 10-17 kg m s-1

    2. Given the mass of electron id 9.11 × 10-31kg Planck constant is 6.626 × 10-34 Js,
    the uncertainty involved in the measurement of velocity within a distance of 0.1 Å is
    a) 5.79 × 106 ms-1
    b) 5.79 × 107 ms-1
    c) 5.79 × 108 ms-1
    d) 5.79 × 105 ms-1

  • 3. Chemical Bonding - Quiz


    1. The ion that is isoelectronic with CO is
    a) $O_{2}^{-}$
    b) N_{2}^{+}
    c) O_{2}^{+}
    d) CN-

    2. Which of the following species is paramagnetic?
    a) $O_{2}^{2-}$
    b) NO
    c) CO
    d) CN-

  • 4. Solutions - Quiz


    1. The vapour pressure of benzene at a certain temperature is 640mmHg. A non-volatile and non-electrolyte solid, weighing 2.175 g is added to 39.08g of benzene. If the vapour pressure of the solution is 600mmHg, what is the molecular weight of solid substance?
    a) 49.50
    b) 59.60
    c) 69.40
    d) 79.82

    2. 0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If kf for water is 1.86 K kg mol-1, the lowering in freezing point of the solution is
    a) -1.12 K
    b) 0.56 K
    c) 1.12 K
    d) -0.56K

  • 5. States of Matter - Quiz


    1. Cyclopropane and oxygen at partial pressures 170 Torr and 570 Torr are mixed in a gas cylinder . What is the ratio of the number of moles of cyclopropane to the number of moles of oxygen?
    a) $\frac{170 \times 42 }{570 \times 32}= 0.39$
    b) $\frac{\frac{170}{42}}{\left ( \frac{170}{42} + \frac{570}{32} \right )} \approx = 0.19$
    c) $\frac{170}{740} = 0.23$
    d) $\frac{170}{570} = 0.30$

    2. Under what conditions will a pure sample of an ideal gas not only exhibit a pressure of 1 atm but also a concentration of 1 mol L-1?(R = 0.082 L atm mol-1deg-1)
    a) At STP
    b) when V = 22.4 L
    c) When T = 12K
    d) Impossible under any conditions

  • 6. Nuclear Chemistry - Quiz


    1. A human body required the 0.01 M activity of radioactive substance after 24h. Half-life of radioactive substance is 6h. Then , injection of maximum activity of radioactive substance that can be injected will be
    a) 0.08
    b) 0.04
    c) 0.16
    d) 0.32

    2. If bXa species emit firstly a positron, then two α and two β and in last one α is also emitted and finally convert in dYc species, so correct relation is
    a) a = c+12, d = b-5
    b) a = c-8 , d = b-1
    c) a = c-6, d = b-0
    d) a = c-4, d = b-2

  • 7. Chemical Equilibrium - Quiz


    1. The rate of reaction depends upon the
    a) volume
    b) force
    c) pressure
    d) conc Of reactants

    2. Which one of the following information can be obtained on the basis of Le-Chateliers principle?
    a) Dissociation constant of a weak acid
    b) Entropy change in a reaction
    c) Equilibrium constant of a chemical reaction
    d) Shift in equilibrium position on changing value of a constraint

  • 8. Ionic Equilibrium - Quiz


    1. Which of the following pairs constitutes a buffer?
    a) HNO2 and NaNO2
    b) NaOH and NaCl
    c) HNO3 and NH4NO3
    d) HCl and KCl

    2. Which of the following statements about pH and H+ ion concentration is incorrect?
    a) Addition of one drop of concentrated HCl in NH4OH solution decreases pH of the solution
    b) A solution of the mixture of one equivalent of each of CH3COOH and NaOH has a pH of 7
    c) pH of pure neutral water is not zero
    d) A cold and conc H2SO4 has lower H+ ion concentration than a dilute solution of H2SO4

  • 9. Thermodynamics - Quiz


    1. Heat of combustion ΔH0 for C(s) , H2(g) and CH4(g) are -94, -68 and -213 kcal/mol. Then, ΔH0 for C(s) + 2 H2(g) → CH4(g) is
    a) -17 kcal
    b) -111 kcal
    c) -170 kcal
    d) -85 kcal

    2. A chemical reaction will be spontaneous if it is accompanied by a decrease in
    a) entropy of the system
    b) enthalpy of the system
    c) internal energy of the system
    d) free energy of the system

  • 10. Chemical Kinetics - Quiz


    1. The rate constants k1 and k2 for two different reactions are 1016.e-2000/T and 1015 . E-1000/T respectively. The temperature at which k1 =- k2 is.
    a) 1000 K
    b) $\frac{2000}{2.303}K$
    c) 2000 K
    d) $\frac{1000}{2.303}K$

    2. The rate of the first order of reaction is 1.5 × 10-2 mol L-1 min-1 at 0.5 M concentration of the reactant. The half-life of the reaction is
    a) 0.383 min
    b) 23.1 min
    c) 8.73 min
    d) 7.53 min

  • 11. Electrochemistry - Quiz


    1. An electrochemical cell is shown below
    Pt, H2(1 atm)|HCl(0.1M)|CH3COOH(0.1M)|H2(1 atm), pt.
    The emf of the cell will not be zero, because
    a) emf depends on molarities of acids used
    b) pH of 0.1 M HCl and 0.1 M CH3COOH is not same
    c) the temperature is constant
    d) acids used in two compartments are different

    2. E0 for the cell , Zn|Zn2+ (aQ) ||Cu2+ (aq) |Cu is 1.10 V at 250C. The equilibrium constant for the reaction,
    Zns(s)+Cu2+(aq)  Cu(s) + Zn2+ (aq)
    is of the order
    a) 10-37
    b) 10-28
    c) 1018
    d) 1017

  • 12. Surface Chemistry - Quiz


    1. For adsorption of a gas on a solid, the plot of $log\frac{x}{m} \ vs \ log$ p is linear with slope equal to (n being whole number)
    a) k
    b) log k
    c) n
    d) $\frac{1}{n}$

    2. The ability of anion to bring about coagulation of a given colloid depends upon
    a) its charge
    b) the sign of the charge alone
    c) the magnitude of its charge
    d) both magnitude and sign of its charge

  • 13. Metallurgical Operations, Hydrogen and its Compounds - Quiz


    1. Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offer an exception and is concentrated by chemical leaching?
    a) Argentite
    b) Galena
    c) Copper pyrite
    d) Sphalerite

    2. Which of the following metal evolves hydrogen on reacting with cold dilute HNO3?
    a) Mg
    b) Al
    c) Fe
    d) Cu

  • 14. Chemical Periodicity - Quiz


    1. The correct order of decreasing second ionisation enthalphy of Ti(22), V(23), Cr(24) and Mn(25) is
    a) Cr>Mn>V>Ti
    b) V>Mn>Cr>Ti
    c) Mn>Cr>Ti>V
    d) Ti>V>Cr>Mn

    2. In the periodic table from left to right in a period, the atomic volume
    a) decreases
    b) increases
    c) remains same
    d) first decrease then increases

  • 15. Comparative Study of Elements - Quiz


    1. Polyanion formation is maximum in
    a) nitrogen
    b) oxygen
    c) sulphur
    d) boron

    2. Which one of the following statements about the zeolites is false?
    a) They are used as cation exchangers
    b) They have open structure which enables them to take up small molecules
    c) Zeolites are aluminosilicates having three dimensional network
    d) some of the $SiO_{4}^{4-}$units are replaced by $AlO_{5}^{4-}$ and $AlO_{6}^{9-}$ ions in zeolites

  • 16. d- and f-Block Elements - Quiz


    1. The aqueous solution containing which one of the following ions will be colourless?
    At no : Sc = 21, Fe = 26, Ti = 22, Mn = 25)
    a) Sc3+
    b) Fe2+
    c) Ti3+
    d) Mn3+

    2. Among the following series of transition metal ions, the one in which all metal ions have 3d2 electronic configuration is: (At no : Ti = 22; V = 22; Cr = 24; Mn = 25)
    a) Ti3+, V2+, Cr3+, Mn4+
    b) Ti+, V4+, Cr6+, Mn7+
    c) Ti4+, V3+, Cr2+, Mn3+
    d) Ti2+, V3+, Cr4+, Mn5+

  • 17. Coordination Compounds - Quiz


    1. [Co(NH3)4(NO2)2]Cl exhibits
    a) linkage isomerism , geometrical isomerism and optical isomerism
    b) linkage isomerism, ionisation isomerism and optical isomerism
    c) linkage isomerism, ionisation isomerism and geometrical isomerism
    d) ionisation isomerism, geometrical isomerism and optical isomerism.

    2. Which of the following complexes exhibits the highest paramagnetic behaviour?
    where , gly = glycine, en=ethylenediamine and bpy = bipyridyl moities)
    (At no Ti = 22),V = 23, Fe = 26, Co= 27)
    a) [V(gly)2)(OH)2(NH3)2]+
    b) [Fe(en)(bpy)(NH3)2]2+
    c) [Co(OX)2(OH)2]-
    d) [Ti(NH3)6]3+

  • 18. Chemical Analysis - Quiz


    1. An organic compound contains carbon, hydrogen and oxygen . Its elemental analysis gave C, 38.71% and H, 9.67 % the empirical formula of the compound would be
    a) CH3O
    b) CH2O
    c) CHO
    d) CH4O

    2. Lassaignes test for the detection of nitrogen fails in
    a) NH2CONHNH2.HCl
    b) NH2NH2.HCl
    c) NH2CONH2
    d) C6H5NHNH2.HCl

  • 19. General Organic Chemistry - Quiz


    1. CH3-CHCl-CH2-CH3 has a chiral centre. Which one of the following represents its R configuration?

    2. The correct order regarding the electronegativity of hybrid orbitals of carbon is
    a) sp > sp2 < sp3
    b) sp > Sp2 > sp3
    c) sp < sp2 > sp3
    d) sp < sp2 < sp3

  • 20. Hydrocarbons - Quiz


    1. Which of the following compounds with molecular formula, C5H10 yields acetone on ozonolysis?
    a) 2-methyl-2-butene
    b) 3-methyl-1-butene
    c) Cyclopentane
    d) 2-methyl-1-butene

    A (predominantly) is

  • 21. Alkyl Halides, Alcohols, Phenols and Ethers - Quiz


    1. The compound which reacts fastest with Lucas reagent is ( at room temperature)
    a) butan-1-ol
    b) butan-2-ol
    c) 2-methyl propan-1-ol
    d) 2-methyl propan-2-ol

    2. Which of the following is correct?
    a) Cycloheptane is an aromatic compound
    b) Diastase is an enzyme
    c) Acetophenone is an ether
    d) All of the above

  • 22. Aldehydes and Ketones - Quiz


    1. Polarisation of electrons in acrolein may be written as

    2. Iodoform test is not given by
    a) 2-pentanone
    b) ethanol
    c) ethanal
    d) 3-pentanone

  • 23. Carboxylic Acids and their derivatives - Quiz


    1. Reduction by LiAlH4 of hydrolysed product of an ester gives
    a) two acids
    b) two aldehydes
    c) one molecules of alcohol and another of carboxylic acid
    d) two alcohols

    2. Which of the following represents the correct order of acidity in the given compounds?

  • 24. Nitrogen Compounds - Quiz


    1. Aniline in a set of reactions yielded a product D.

    The structure of the product D would be
    a) C6H5CH2NH2
    b) C6H5NHCH2CH3
    c) C6H5NHOH
    d) C6H5CH2OH

    2. Phenyl isocyanides are prepared from which of the following reaction?
    a) Rosemunds reaction
    b) Carbylamine reaction
    c) Reimer-Tiemann reaction
    d) Wurtz reaction

  • 25. Polymers - Quiz


    1. Which one of the following is a chain growth polymer?
    a) Starch
    b) Nucleic acid
    c) Polystyrene
    d) Protein

    2. Structure of some common polymers are given . Which one is not correctly presented?

  • 26. Biomolecules and Chemistry in Everyday Life - Quiz


    1. In DNA, the complementary bases are
    a) adenine and thymine, guanine and cytosine
    b) uracil and adenine, cytosin and guanine
    c) adenine and guanine, thymine and cytosin
    d) adenine and thymin, guanine and uracil

    2. The couplings between base units of DNA is through
    a) hydrogen bonding
    b) electrostatic bonding
    c) covalent bonding
    d) van der Waals forces