## Class/Course - Class XI

### Subject - Chemistry

#### Total Number of Question/s - 6390

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• 1. Some Basic Concepts of Chemistry - Quiz

1. The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following element contains the greatest number of atoms?
a) 4 g He
b) 46 g Na
c) 0.40 g Ca
d) 12 g He

2. An excess of NaOH was added to 100mL of a FeCl3 solution which gives 2.14 of Fe(OH)3. Calculate the normality of FeCl3 solution.
a) 0.2N
b) 0.3N
c) 0.6N
d) 1.8N

• 2. Structure of Atom - Quiz

1. The transition in HeÃƒÂ¢Ã…ÂÂ Ã¢â‚¬Â¢ ion that would have the same wavelength as the first Lyman line in hydrogen spectrum is
a) 2 → 1
b) 5 → 3
c) 4 → 2
d) 6 → 4

2. The energy of hydrogen atom in its ground state is -13.6 eV. The energy of the level corresponding to the quantum number n = 5 is
a) -0.54 eV
b) -5.40 eV
c) -0.85 eV
d) -2.72 eV

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

1. Element with atomic number 56 belongs to which block?
a) s
b) p
c) d
d) f

2. The electroninc configuration of two elements X and Y are given below:
X = 1s2 2s2 2p6 3s2 3p6 4s2 ;
Y = 1s2 2s2 2p6 3s2 3p5
The formula of the ionic compound that can be formed between these elements is
a) XY
b) XY2
c) X2Y
d) XY3

• 4. Chemical Bonding and Molecular Structure - Quiz

1. Hybridisation of Al in AICI3 (monomeric form above 8000C) and Al2Cl6 (dimeric form below 4000C) respectively are
a) sp2, sp3
b) sp2, sp2
c) sp3, sp>3
d) sp2, dsp2

2. The state of hybridization of C2 , C3 , C5 and C6 of the hydrocarbon is in the following sequence:
a) sp3, sp2, sp2 and sp
b) sp, sp2 , sp2 and sp3
c) sp, sp2 , sp3 and sp2
d) sp, sp3, sp2 and sp3

• 5. States of Matter - Quiz

1. Which gas shows real behaviour?
a) 8g O2 at STP occupies 5.6 L
b) 1 g H2 in 0.5 L flask exerts a pressure of 24.63 atm at 300 K
c) 1 mol NH3 at 300K and 1 atm occupies volume 22.4 L
d) 5.6 L of CO2 at STP is equal to 11g

2. The van der waals equation for one mol of CO2 gas at low pressure will be
a) $\left (P + \frac{a}{V^{2}} \right )V$ = RT
b) $P\left (V - b \right )$ = $RT - \frac{a}{V^{2}}$
c) P = $\frac{RT}{V - b}$
d) P = $\left (\frac{RT}{V - b} - \frac{a}{V^{2}} \right )$

• 6. Thermodynamics - Quiz

1. Which one of the following statement is false
a) Work is state function
b) Temperature is a state function
c) Change in the state is completely defined when the initial and final states are specified
d) Work appeasrs at the boundary of the system

2. If in a reaction at constant temperature ,n1 moles of the gaseous reactants change into n2 moles of gaseous products, the difference in the enthalpy change and internal energy change of the reaction will be equal to________.
a) ΔH - ΔU = (n2 -n1)RT = ΔngRT
b) ΔH + ΔU = (n2 -n1)RT = ΔngRT
c) ΔH - ΔU = (n2 + n1)RT = ΔngRT
d) ΔH - ΔU = (n2 -n1)T = ΔngT

• 7. Equilibrium - Quiz

1. Aspirin (acetyl salicyclic acid, molar mass = 180 g mol-1) used as analgesic has pKa value of 2. Two tablets of asprin each weighing 90 mg mol-1) used as analgesic has pKa value of 2. Two tablets of aspirin each weighing 90 mg are dissolved in 100 mL of water. The pH of the solution is
a) 0.5
b) 1
c) 2
d) 4

2. The pH of a solution prepared by mixing 2.0 ml of HCI solution of pH 3.0 and 3.0 ml of NaOH solution of pH 10.0 is
a) 2.5
b) 3.5
c) 5.5
d) 6.5

• 8. Redox Reactions - Quiz

1. For the redox reaction
$MnO_{4}^{\circleddash} + C_{4}O^{2-} + H^{\oplus} \rightarrow Mn^{2+} + CO_{P2} + H_{2}O$
The correct coefficients of the reactions for the balanced reaction are
a) $MnO_{4}^{\circleddash}$ - 2, C2O42- - 5, H - 16
b) $MnO_{4}^{\circleddash}$ - 16, C2O42- - 5, H - 2
c) $MnO_{4}^{\circleddash}$ - 5, C2O42- - 16, H - 2
d) $MnO_{4}^{\circleddash}$ - 2, C2O42- - 16, H - 5

2. A mole of N2H4 loses 10 mol of electrons to form a new compound Y. Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in Y. (There is no change in the oxidation number of hydrogen)
a) -1
b) -3
c) +3
d) +5

• 9. Hydrogen - Quiz

1. Which of the following is not a water softener?
a) Calgon
b) Permutit
c) Na2SO4
d) Na2CO3

2. Which of the following reactions increases production of dihydrogen synthesis gas?
a) CH4(g) + H2O(g) CO (g) + 3 H2 (g)
b) C (s) + H2 O (g) CO (g) + H2 (g)
c) CO (g) + H2 O (g) CO2 (g) + H2 (g)
d) C2H6 + 2 H2O 2 CO + 5 H2

• 10. The s-Block Elements - Quiz

1. The correct order of reducing character of alkali metals is
a) Rb < K < Na < Li
b) Li < Na < K < Rb
c) Na < K < Rb < Li
d) Rb < Na < K < Li

2. Alkaline earth metal carbonates of Ca, Sr and Ba can be dissolved in water in presence of CO2
a) True
b) False

• 11. The p-Block Elements - Quiz

1. Boron cannot form which one of the following anions?
a)
b)
c)
d)

2. A blue coloured mineral lapis lazuli which is used as a semi-precious stone is a mineral of the following class:
a) Sodium aluminosilicate
b) Zinc cobaltate
c) Basic copper
d) Prussian blue

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

1. The IUPAC name of the compound NCCH2CH2COOH is butane-3-nitril-1-oic acid.
a) True
b) False

2. The ascending order of stability of the carbanion

a) P < R < S < Q
b) R < P < S < Q
c) R < P < Q < S
d) P < R < Q < S

• 13. Hydrocarbons - Quiz

1. In the following sequence of reaction, the alkene affords the compound B
CH3CH= CHCH3
The compound B is
a) CH3CHO
b) CH3CH2CHO
c) CH3COCH3
d) CH3CH2COCH3

2. Which is a non-aromatic compound?
a)
b)
c)
d)

• 14. Environmental Chemistry - Quiz

1. Sewage containing organic waste should not be disposed in water bodies because it causes major water pollution. Fishes in such a polluted water die because of
a) Large number of mosquitoes
b) Increases in the amount of dissolved oxygen
c) Decreases in the amount of dissolved oxygen in water
d) Clogging of gills by mud

2. Which of the following statements is not true about classical smog?
a) Its main components are produced by the action of sunlight on emissions of automobiles and factories.
b) Produced in cold and humid climate.
c) It contains compounds of reducing nature.
d) It contains smoke, fog and sukphur dioxide.

• 15. Chemical Equlibrium - Quiz

1. When the reaction , 2NO2(g) $\rightleftharpoons$ N2O4(g) reaches equilibrium at 298K. The partial pressure of NO2 and N2O4 are 0.2 KPa and 0.4 Kpa, respectively. What is the equilibrium constant Kp of the above reaction at 298 K?
a) 0.1
b) 0.5
c) 1.0
d) 2
e) 10

2. 1 mol of N2 is mixed with 3 mol of H2 in a litre container. If 50% of N2 is converted into ammonia by the reaction N2(g) + 3H2(g) $\rightleftharpoons$ 2NH3(g), then the total number of moles of gas at the equilibrium are
a) 1.5
b) 4.5
c) 3.0
d) 6.0

• 16. Ionic Equlibrium - Quiz

1. If the equilibrium constant of BOH $\rightleftharpoons$ B + at 250C I 2.5 x 10-6, then equilibrium constant for BOH + H $\rightleftharpoons$ B + H2O at the same temperature is
a) 40 x 10-9
b) 4.0 x 105
c) 2.5 x 108
d) 2.5 x 10-6

2. Assuming H2SO4 to be completely ionised the pH of a 0.05 M aqueous solution of sulphuric acid is approximately
a) 0.01
b) 0.005
c) 2
d) 1

• 17. Alkanes and Cycloalkanes - Quiz

1. The total number of isomers including stereisomers for 1,3-dimethyl cyclohexane is:
a) 2,cis and 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. The decreasing order of the anti-knocking value of octane number of the following is:
(I) CH4 (II) C2H2 (III) C3H8 (IV) C4H10
a) (I) > (II) > (III) > (IV)
b) (IV) > (III) > (II) > (IV)
c) (I) > (III) > (II) > (IV)
d) (IV) > (II) > (III) > (I)

• 18. Alkenes and Alkadienes - Quiz

1. What is the wrong statement?
a) In oxymercuration and demercuration reaction, alcohol is formed by Markonvikov addition.
b) In hydroboration oxidation reaction , alcohol is formed by anti-Merkonikov addition.
c) Regiospecificity of HBO reaction is syn.
d) Regispecificity of oxymervuration and demercuration reaction is anti and rearrangement occurs.

2.
(A) and (B) are :
a)
b)
c)
d)

• 19. Alkynes - Quiz

1.
Compounds (B) and (C) are:
a)
b)
c)
d) Both is (I) and C is(II)

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

1. Magnesium is an important component of which biomolecule occuring extensively in living world?
a) Haemoglobin
b) ATP
c) Chlorophyll
d) Vitamin B12

2. Lithopone is a mixture of
a) BaSO4 and BaS
b) BaSO4 and ZnS
c) BaO and ZnS
d) BaCO3 and ZnO

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

1. The element which forms only one hydride is:
a) C
b) Si
c) Ge
d) Pb

2. CO is absorbed by :
a) Alcohols
b) Plants
c) An ammonical solution of cuprous chloride
d) Nickel tetracarbonyl

• 22. Classification & Nomenclature of Organic Compounds - Quiz

1. 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)

2. The correct name of the compound (I) is:

a) (E-2), (E-4), Hepta -2, 4 - diene
b) (Z-2), (z-4), Hepta-2, 4-diene
c) (E-2), (Z-4), Hepta-2,4-diene
d) (Z-2), (E-4), Hepta-2,4 - diene

• 23. Quantitative & Qualitative Analysis - Quiz

1. A compound (60 gm) on analysis gave C= 24 gm, H = 4 gm, and O = 32 gm Its empirical formula is:
a) C2 H2 O
b) C2 H4 O2
c) CH2 O
d) CH2 O2

2. In Liebigs method for the estimation of C and H, if the compound also contains both halogens and S, which of the following is kept near the exit of the combustion tube?
a) Silver wire
b) PbCrO4
c) Both (a) and (b)
d) Cu gauge

• 24. Isomerism - Quiz

1. The number of isomers that can be obtained theoretically on monochlorination of 2-methylbutane is :
a) 1
b) 2
c) 3
d) 4

2. The minimum number of carbon atom of an alkane should contain in order exhibit orbit activity is :
a) 5
b) 6
c) 7
d) 8

• 25. General Organic Chemistry - Quiz

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

2. The decreasing order of -I effect of the following is :
I. COOH II. F III. OR IV. NH2 V. OH VL. Ph-
a) I > II > III > IV > V > VI
b) II > I > III > IV > V > VI
c) I > II > V > III > IV > VI
d) II > I > V > III > IV > VI

• 26. Organic Reaction & Mechanism - Quiz

1. Which of the following is not rearrangement reaction?
a)
b)
c)
d)

2. Consider the following reaction:

The product is:
a) 0-Toluidine
b) m-Toluidine
c) p-toludine
d) All