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 density of a solution prepared by dissolving 120g of urea (mol. Mass = 60 u ) in 1000g of water is 1.15 g/mL. The molarity of this solution is:
a) 0.50 M
b) 1.78 M
c) 1.02 M
d) 2.05 M

2. If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will
a) be a function of the molecular mass of the substance
b) remain unchanged
c) increase two fold
d) decrease twice

• 2. States of Matter - Quiz

1. When r, p and M represent rate of diffusion, pressure and molecular mass, respectively, then the ratio of the rates of diffusion (rA/rB) of two gases A and B, is given as
a) (pA/pB)1/2(MA/MB)
b) (pA/pB)(MB/MA)1/2
c) (pA/pB)1/2(MB/MA)
d) (pA/pB)(MA/MB)1/2

2. Total volume of atoms present n a face-centered cubic unit cell of a metal is (r is atomic radius)
a) $\frac{20}{3}\pi r^{3}$
b) $\frac{24}{3}\pi r^{3}$
c) $\frac{12}{3}\pi r^{3}$
d) $\frac{16}{3}\pi r^{3}$

• 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. Which of the following nuclear reactions will generate an isotope?
a) Neutron particle emission
b) Position emission
c) α-particle emission
d) β-particle emission

• 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. Using MO theory, predict which of the following species has the shotest bond length?
a) $O_{2}^{2+}$
b) $O_{2}^{+}$
c) $O_{2}^{-}$
d) $O_{2}^{2-}$

• 5. Thermodynamics - Quiz

1. A reaction is non-spontaneous at the freezing point of water but is spontaneous at the boiling point of water , then
δH ΔS
a) ΔH = +ve , ΔS = +ve
b) ΔH = -ve , ΔS = -ve
c) ΔH = -ve , ΔS = +ve
d) ΔH = +ve , ΔS = -ve

2. For the complete combustion of ethanol,
C2H5OH(l) + 3O2(g) → 2CO2 (g) + 3H2O (l)
the amount of heat produced as measured in bomb calorimeter is 1364.47 kJ mol-1 at 250C. Assuming ideality, the ehthalpy of combustion, ΔCH for the reaction will be
a) -1366.95 kJ mol-1
b) -1361.95 kJ mol-1
c) -1460.50 kJ mol-1
d) -1350.50 kJ mol-1

• 6. Solutions - Quiz

1. 6.02 x 1020 molecules of urea are present in 100 mL of its solution. The concentration of urea solution is
(Avogadro constant, NA = 6.02 x 1023 mol-1)
a) 0.001M
b) 0.01M
c) 0.02 M
d) 0.1M

2. Equal masses of methane and oxygen are mixed in an empty container at 250 C. the fraction of the total pressure exerted by oxygen is
a) $\frac{2}{3}$
b) $\frac{1}{3} \times \frac{273}{298}$
c) $\frac{1}{3}$
d) $\frac{1}{2}$

• 7. Equilibrium - Quiz

1. 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

2. Three reactions involving $H_{2}PO_{4}^{-}$ are given below
I. H3PO3 + H2O → H3O+ + $H_{2}PO_{4}^{-}$
II. $H_{2}PO_{4}^{-}$ + H2O → $HPO_{4}^{2-}$ + H3O+
III. $H_{2}PO_{4}^{-}$ + OH- → H3PO4 + O2-
In which of the above does $H_{2}PO_{4}^{-}$ act as an acid?
a) II only
b) I and II
c) III only
d) I only

• 8. Redox Reactions and Electrochemistry - Quiz

1. In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to
a) generate-heat
b) create potential difference between the two electrodes
c) produce high purity water
d) remove adsorbed oxygen from electrode surfaces

2. In which of the following reactions H2O2 acts as a reducing agent?
1. H2O2 + 2H+ + 2e- → 2H2O
2. H2O2 - 2e- → O2 + 2H+
3. H2O2 + 2e- → 2OH-
4. H2O2 + 2OH- - 2e- → O2 + 2H2O
a) 1,2
b) 3,4
c) 1,3
d) 2,4

• 9. Chemical Kinetics and Surface Chemistry - Quiz

1. t1/4 can be taken as the time taken for the concentration of a reactant to drop to $\frac{3}{4}$ of its first order reaction is k, the t1/4 can be written as
a) 0.75/k
b) 0.69/k
c) 0.29/k
d) 0.10/k

2. Which of the following statements is incorrect regarding physisorptions?
a) It occurs because of van der waala forces
c) Under high pressure, it results into multi molecular layer on adsorbent surface

• 10. Periodicity of Elements - Quiz

1. The radius of La+ (atomic number : La = 57) is 1.06 Å . Which one of the following given values will be closest to the radius of Lu3+ ( atomic number : Lu = 71) ?
a) 1.60Å
b) 1.40Å
c) 1.06 Å
d) 0.85 Å

2. Which one of the following sets of ions represents a collection of isoelectronic species?
a) K+ , Cl-, Ca2+ , Sc3+
b) Ba2+, Sr2+, K+, S2-
c) N3-, O2-, F-, S2-
d) Li+ , Na+, Mg2+, Ca2+

• 11. Principles and Processes of Metallurgy - Quiz

1. Which series of reactions correctly represent chemical relations related to iron and its compound?
a) $Fe \overset{Dil.H_{2}SO_{4}}{\rightarrow} FeSO_{4} \overset{H_{2}SO_{4}.O_{2}}{\rightarrow} Fe_{2}\left (SO_{4} \right )_{3} \overset{Heat}{\rightarrow}Fe$
b) $Fe\overset{O_{2},heat}{\rightarrow}FeO \overset{dil.H_{2}SO_{4}}{\rightarrow}FeSO_{4}\overset{Heat}{\rightarrow}Fe$
c) $Fe\overset{Cl_{2}.heat}{\rightarrow}FeCl_{3} \overset{Heat,air }{\rightarrow}FeCl_{2}\overset{Zn}{\rightarrow}Fe$
d) $Fe\overset{O_{2}.heat}{\rightarrow}Fe_{3}O_{4}\overset{CO,600^{0}C}{\rightarrow}FeO\overset{CO,700^{0}C}{\rightarrow}Fe$

2. Which one of the following ores is best concentrated by froth-floatation method?
a) magnetite
b) Cassiterite
c) Galena
d) Malachite

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

1. PCl3 and PCl5 both exist; NCl3 exists but NCl5 does not exist. It is due to
a) lower electronegativity of P than N
b) lower tendency of N to form covalent bond
c) availability of vacant d-orbital in P but not in N
d) statement is itself incorrect

2. In curing cement plasters, water is sprinkled from time to time. This helps in
a) keeping it cool
b) developing interlocking needle-like crystals of hydrated silicates
c) hydrating sand and gravel mixed and cement
d) converting sand into silicic acid

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

1. A square planar complex is formed by the hybridisation of the following atomic orbitals
a) $s,p_{x},p_{y},p_{z}$
b) $s,p_{x},p_{y},p_{z},d$
c) $d,s,p_{x},p_{y}$
d) $s,p_{x},p_{y},p_{z},d,d$

2. Type of isomerism shown by [Cr(NH3)5NO2]Cl2 is
a) optical
b) ionisation
c) geometrical

• 14. Environmental Chemistry - Quiz

1. Identify the wrong statements in the following
a) Chlorofluorocarbons are responsible for ozone layer depletion
b) Green house effect is responsible for global warming
c) Ozone layer does not permit infrared radiation from the sun to reach the earth
d) Acid rain is mostly because of oxides of nitrogen and sulphur

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

• 15. General Organic Chemistry - Quiz

1. Following types of compounds (as, I,II)

are studied in terms of isomerism in
a) chain isomerism
b) position isomerism
c) conoformers
d) stereisomerism

2. Among the following four structures I to IV

It is true that
a) all four are chiral compounds
b) only I and II are chiral compounds
c) only III is a chiral compound
d) only II and IV are chiral compounds

• 16. Hydrocarbons and their Halogen Derivatives - Quiz

1. The treatment of CH3MgX with $CH_{3}\equiv C-H$ produces
a) CH3-CH=cH2
b) $CH_{3}C \equiv C - CH_{3}$
c)
d) CH4

2. Compound (A) C8 H9 gives a white precipitate when warmed with alcoholic AgNO3. Oxidation of (A) gives an acid (B), C8H6O4. (B) easily forms anhydride on heating . Identity the compound (A).
a)
b)
c)
d)

• 17. Organic Compounds Containing Oxygen - Quiz

1. Maximum dehydration takes place in that of
a)
b)
c)
d)

2. The compound formed as a result of oxidation of ethyl benzene by KMnO4 is
a) benzophenone
b) acetophenone
c) benzoic acid
d) benzyl ethanol

• 18. Organic Compounds Containing Nitrogen - Quiz

1. Considering the basic strength of amines in aqueous solution , which one has the smallest pKb value?
a) (CH3)2NH
b) CH3NH2
c) (CH3)3N
d) C6H5NH2

2. In the chemical reaction,
CH3CH2NH2 + CHCl3 + 3KOH → (A) + (B) + 3H2O,
the compounds (A) and (B) are respectively
a) C2H5CN and 3KCL
b) C3CH2CONH2 and 3KCl
c) C2 H5 NC and 3KCl
d) C2 H5 NC and 5KCl

• 19. Polymers and Biomolecules - Quiz

1. RNA contains
a) ribose sugar and thymine
b) ribose sugar and uracil
c) deoxyribose sugar and uracil
d) deoxyribose sugar and thymine

2. Which of the following compounds can be detected by Molisch's test?
a) Nitro compounds
b) Sugars
c) Amines
d) Primary alcohols

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

1. For the estimation of nitrogen , 1.4 g of an organic compound was digested by kjeldahls method and the evolved ammonia was absorbed in 6 mL of $\frac{M}{10}$ sulphuric acid .The unreacted acid required 20 mL of $\frac{M}{10}$ sodium hydroxide for the complete neutralization .The percentage of nitrogen in the compound is
a) 6%
b) 10%
c) 3%
d) 5%

2. The compound formed of the positive test for nitrogen with the Lassaigne solution of an organic compound is
a) Fe4[Fr(CN)6]3
b) Na3 [Fe(CN)6]
c) Fe(CN)3
d) Na4[Fe(CN)5NOS]