## Class/Course - Engineering Entrance

### Subject - Chemistry

#### Total Number of Question/s - 3121

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• 1. Some Basic Concepts of Chemistry - Quiz

1. The molality of urea of solution in which 0.0100 g of urea, [(NH2)2CO] is added to 0.3000 dm3 of water at STP is
a) 5.55 × 10-4 M
b) 33.3 M
c) 3.33 × 10-2 M
d) 0.555 M

2. What volume of hydrogen gas, at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen ?
a) 89.6 L
b) 67.2L
c) 44.8 L
d) 22.4 L

• 2. States of Matter - Quiz

1. Experimentally, it was found that a metal oxide has formula M0.98O. Metal M, present as M2+ and M2+ in its oxide. Fraction of the metal which exists as M3+ would be
a) 7.01%
b) 4.08%
c) 6.05%
d) 5.08%

2. Number of atoms in the unit cell of Na (bcc type crystal) and Mg (fcc type crystal) are, respectively
a) 4,4
b) 4,2
c) 2,4
d) 1,1

• 3. Atomic Structure - Quiz

1. The energy required to break one mole of Cl-Cl bonds in Cl2 is 242 kJ mol-1 . The longest wavelength of light capable of breaking a single Cl-Cl bond is
a) 594 nm
b) 640 nm
c) 700 nm
d) 494 nm

2. The orbit angular momentum for an electron revolving in an orbit is given by $\sqrt{l\left (l + 1 \right )}\frac{h}{2\pi}$ . This momentum for s-electrons will be given by
a) $+\frac{1}{2} . \frac{h}{2\pi}$
b) zero
c) $\frac{h}{2\pi}$
d) $+\frac{1}{2} . \frac{h}{2\pi}$

• 4. Chemical Bonding - Quiz

1. In which of the following pairs of molecules from both species are not likely to exist?
a) $H_{2}^{+}$ , $He_{2}^{2-}$
b) $H_{2}^{-}$ , $He_{2}^{2-}$
c) $H_{2}^{2+}$ , $He_{2}$
d) $H_{2}^{-}$ , $He_{2}^{2+}$

2. In which of the following ionisation processes, the bond order has increased and the magnetic behaviour has changed?
a) C2 → $C_{2}^{+}$
b) NO → NO
c) O2 → $O_{2}^{+}$
d) N2 → $N_{2}^{+}$

• 5. Thermodynamics - Quiz

1. The value of enthalpy change (ΔH) for the reaction
C2H5OH (l) + 3O2(g) → 2CO2 (g) + 3H2O (l) at 270C is -1366.5 kJ mol-1. The value of internal energy change for the above reaction at this temperature will be
a) -1371.5 kJ
b) -1369.0 kJ
c) -1364.0 kJ
d) -1361.5 kJ

2. The incorrect expression among the following is
a) $\frac{\Delta G_{system}}{\Delta G_{total}}$ = -T
b) In isothermal process, Wreversible = $-nRT \ ln\frac{V_{f}}{V_{i}}$
c) ln K = $\frac{\Delta H^{0} - T\Delta S^{0}}{RT}$
d) K = e-ΔG0/RT

• 6. Solutions - Quiz

1. If liquid A and B form an ideal solution, the
a) enthalpy of mixing is zero
b) entropy of mixing is zero
c) free energy of mixing is zero
d) free energy as well as te entropy of mixing are each zero

2. Density of a 2.05 M solutions of acetic acid in water is 1.02 g/mL. The molality of the solution is
a) 1.14 mol kg-1
b) 3.28 mol kg-1
c) 2.28 mol kg-1
d) 0.44 mol kg-1

• 7. Equilibrium - Quiz

1. Four species are listed below
I. $HCO_{3}^{-}$ II. H3O+
III. $HSO_{4}^{-}$ IV. HSO3F
Which one of the following is the correct sequence of their acid strength?
a) IV < II < III < I
b) II < III < I < IV
c) I < III < II < IV
d) III < I < IV < II

2. An acid HA ionises as HA $\rightleftharpoons$ H+ + A-
The pH of 1.0 M solution is 5. Its dissociation constant would be
a) 1 × 10-10
b) 5
c) 5 x 10-8
d) 1 x 10-5

• 8. Redox Reactions and Electrochemistry - Quiz

1. The $E_{M^{3+}/M^{2+}}^{0}$ values, for Cr, Mn Fe and Co are -0.41, + 1,57 , + 0.77 and +1.97 V, respectively. For which one of these metals, the change in oxidation state from + 2 to +3 is easiest ?
a) Cr
b) Mn
c) Fe
d) Co

2. The equivalent conductances of two strong electrolytes at infinite dilution in H2O (where ions move freely through a solution) at 250 C are given below
$\Lambda{^{0}}_{CH_{3}COONa}$ = 91.0 S cm2 /equiv
$\Lambda{^{0}}_{HCl}$ = 426.2 S cm2/equiv
What additional information\quantity one needs to calculate &Lmabda;0 of an aqueous solution of acetic acid?
a) Λ0 of NaCl
b) Λ0 of CH3COOK
c) The limiting equivalent conductance of H+0H+)
d) Λ0 of chloroacetic acid (ClCH2COOH)

• 9. Chemical Kinetics and Surface Chemistry - Quiz

1. Rate of a reaction can be expressed by Arrhenius equation as k = Ae-E/RT
In this equation, E represents
a) the energy above which all the colliding molecules will react
b) the energy below which colloiding molecules will not react
c) the total energy of the reacting molecules at a temperature T
d) the fraction of molecules with energy greater than the activation energy of the reaction

2. For a reaction $\frac{1}{2} \rightarrow 2B$, rate of disappearance of A is related to the rate of appearance of B by the expression
a) $-\frac{d\left [A \right ]}{dt}$ = $\frac{1}{2}\frac{d\left [B \right ]}{dt}$
b) $-\frac{d\left [A \right ]}{dt}$ = $\frac{1}{4}\frac{d\left [B \right ]}{dt}$
c) $-\frac{d\left [A \right ]}{dt}$ = $\frac{d\left [B \right ]}{dt}$
d) $-\frac{d\left [A \right ]}{dt}$ = $4\frac{d\left [B \right ]}{dt}$

• 10. Periodicity of Elements - Quiz

1. Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements give the correct picture?
a) The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number of down the group
b) In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group
c) Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens
d) In alkali metals, the reactivity increases but in the halogens it decreases with increase in atomic number down the group

2. The formation of the oxide ion O2- (g) requires first an exothermic and then an endothermic step as shown below
O(g) + e- = O-; (g) ; Δ H0 = -142 kJ mol-1
O-(g) + e- = O2- (g); ΔH0 = 844 kJ mol-1
This is because
a) oxygen is more electronegative
b) oxygen has high electron affinity
c) O- ion will tend to resist the addition of another electron
d) O- ion has comparatively larger size than oxygen atom

• 11. Principles and Processes of Metallurgy - Quiz

1. Refining of impure copper with zinc impurity is to be done electrolysis using electrodes as
a) cathode - pure copper, Anode - pure zinc
b) cathode - pure zinc, Anode - copper
c) cathode - pure copper, Anode - impure copper
d) cathode - pure zinc, Anode - impure zinc

2. Which method of purification is represented by the following equation?
$Ti(s) + 2I_{2}(g) \overset{523 K}{\rightarrow} Til_{4}(g)\overset{1700K}{\rightarrow} Ti(g) + 2I_{2}(g)$
a) Zone refining
b) Cupellation
c) Polling
d) van-Arkel

• 12. Hydrogen, s and p-Block Elements - Quiz

1. The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to
a) a change in the crystalline structure of tin
b) an interaction with nitrogen of the air at very low temperatures
c) a change in the partial pressure of oxygen in the air
d) an interaction with water vapour contained in the humid air

2. What is the best description of the change that occurs when Na2O(s) is dissolved in water?
a) Oxidation number of sodium decreases
b) Oxide ion accepts a shared pair of electrons
c) Oxide ion donates a pair of electrons
d) Oxidation number of oxygen increases

• 13. d- and f-Block Elements and Coordination Chemistry - Quiz

1. Most common oxidation states of Ce (Cerium) are
a) +3, +4
b) +2,+3
c) +2,+1
d) +3,+5

2. In which of the following octahedral complexes of Co ( At no. 27), will the magnitude of Δ0 be the highest ?
a) $[Co(CN)_{6}]^{3-}$
b) $[Co(C_{2}O_{4})_{3}]^{3-}$
c) $[Co(H_{2}O)_{6}]^{3+}$
d) $[Co(NH_{3})_{6}]^{3+}$

• 14. Environmental Chemistry - Quiz

1. Identify the incorrect statement from the following
a) Oxides of nitrogen in the atmosphere can cause the depletion of ozone layer
b) Ozone absorbs the intense ultraviolet radiations of the sun
c) Depletion of ozone layer is because of its chemical reactions with chlorofluoro alkenes

2. What is DDT among the following?
a) Green house gas
b) A fertilizer

• 15. General Organic Chemistry - Quiz

1. The decreasing order of nucleophilicity among the nucleophiles
(A)
(B) CH3O-
(C) CN-
(D)
a) (C), (B), (A), (D)
b) (B), (C), (A), (D)
c) (D), (C), (B), (A)
d) (A), (B), (C), (D)

2. For which of the following parameters, the structural isomers C2H5OH and CH3OCH3 would be expected to have the same values? (Assume ideal behaviour)
a) Heat of vaporisation
b) Vapour pressure at the same temperature
c) Boiling points
d) Gaseous densities at the same temperature amd pressure

• 16. Hydrocarbons and their Halogen Derivatives - Quiz

1. 2-methyl butane on reacting with bromine in the presence of sunlight gives mainly
a) 1-bromo-3-methylbutane
b) 2-bromo-3-methylbutane
c) 2-bromo-3-methylbutane
d) 1-bromo-2-methylbutane

2. HBr reacts with CH2=CH-OCH3 under anhydrous conditions at room temperature to give
a) CH3CHO and CH3Br
b) $BrCH_{2}cHO \ and \ CH_{3}OH$
c) $BrCH_{2}-CH_{2}-OCH_{3}$
d) $H_{3}C-CHBr-OCH_{3}$

• 17. Organic Compounds Containing Oxygen - Quiz

1. From amongst the following alcohols the one that would react fastest with conc. HCl and anhydrous ZnCl2 is
a) 2-butanol
b) 2-methylpropan-2-1
c) 2-methylpropanol
d) 1-butanol

2. Among the following the one that gives positive iodoform test upon reaction with I2 and NaOH is
a) CH3CH2CH(OH)CH2CH3
b) C6H5CH2OH
c)
d) PhCHOHCH3

• 18. Organic Compounds Containing Nitrogen - Quiz

1. The correct order of increasing basic nature for the bases NH3 , CH3NH2 and (CH3)2 a) CH3NH2 < (CH3)2NH
b) (CH3)2NH < NH3 < CH3NH2
c) NH3 < CH3NH2 < (CH3)2NH
d) CH3NH2 < (CH3)2NH < NH3

2. In the chemical reaction

. compounds A and B respectively are
a) nitrobenzene and flurobenzene
b) phenol and benzene
c) benzene diazonium chloride and flurobenzene
d) nitrobenzene and chlorobenzene

• 19. Polymers and Biomolecules - Quiz

a) polyvinyl polymer
b) polyester polymer
c) polyamide polymer
d) polyethylene polymer

2. Buna-N synthetic rubber is a copolymer of
a) and H2C=CH-CH=CH2
b) H2C=CH-CH=CH2 and H5C6-CH=CH2
c) H2C=CH-CN and H2C=CH-CH=CH2
d) H2C=CH-CN and

• 20. Analytical Chemistry and Chemistry in Everyday Life - Quiz

1. which one of the following types of drugs reduces fever?
a) Transquiliser
b) Antibiotic
c) Antipyretic
d) Analegsic

2. Which of the following could act as a propellant for rockets?
a) Liquid hydrogen + liquid nitrogen
b) Liquid oxygen + liquid argon
c) Liquid hydrogen + liquid oxygen
d) Liquid nitrogen + liquid oxygen