## Class/Course - Engineering Entrance

### Subject - Chemistry

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

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• 1. Some Basic Concepts of Chemistry - Quiz

1. A gaseous hydrocarbon gives upon combustion, 0.72 g of water and 3.08 g of CO2. The empirical formula of the hydrocarbon is:
a) C2H4
b) C3H4
c) C6H5
d) C7H8

2. The molarity of a solution obtained by mixing 750 mL of 0.5 M HCl with 250mL of 2M HCl will be
a) 0.875 M
b) 1.00 M
c) 1.75 M
d) 0.0975 M

• 2. States of Matter - Quiz

1. In a face-centered cubic lattice, atom A occupies the corner positions. If one atom of B is missing from one of the face centered points , the formula of the compounds is
a) A2B
b) AB2
c) AB
d) A2B2

2. Which one of the following statements is not true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?
a) The area under the distribution curve remains the same as under the lower temperature
b) The distribution becomes broader
c) The fraction of the molecules with the most probable speed increases
d) The most probable speed increases

• 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 ionisation enthalpy of hydrogen atom is 1.312× 106 J mol-1 . The energy required to excite the electron in the atom from n1 = 1 to n=2 is
a) 8.51×105 J mol-1
b) 6.56 × 105 J mol-1
c) 7.56 × 105 J mol-1
d) 9.84 × 105 mol-1

• 4. Chemical Bonding - Quiz

1. For which of the following molecule significant μ = 0?
(i)
(ii)
(iii)
(iv)
a) Only (i)
b) (i) and (ii)
c) Only (iii)
d) (iii) and (iv)

2. The decreasing values of bond angles from NH3 (1070) to SbH3 (910) down group-15 of the periodic table is due to
a) increasing bp-bp repulsion
b) increasing p-orbital character in sp3
c) decreasing lp-bp repulsion
d) decreasing electronegativity

• 5. Thermodynamics - Quiz

1. For a spontaneous reaction, the ΔG, equilibrium constant (K) and E0 cell will be respectively
a) -ve , > 1, -ve
b) -ve, < 1, -ve
c) +ve, > 1, -ve
d) -ve , > 1, +ve

2. Identify the correct statement regarding a spontaneous process
a) For a spontaneous process in an isolated system, the change in entropy is positive
b) Endothermic process are never spontaneous
c) Exothermic process are always spontaneous
d) Lowering of energy in the reaction process is the only criteria for spontaneity

• 6. Solutions - Quiz

1. 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) $\frac{1}{2}$

2. Equimolar solutions in the same solvent have
a) different boiling point and freezing point
b) same boiling point and same freezing point
c) same freezing point but different boiling point
d) same boiling point but different freezing point

• 7. Equilibrium - Quiz

1. The pH of a 0.1 molar solution of the acid HQ is 3. The value of the ionisation constant, Ka of the acid is
a) 3 x 10-1
b) 1 x 10-3
c) 1 x 10-5
d) 1 x 10-7

2. The conjugate base of $H_{2}PO_{4}^{-}$ is
a) $PO_{4}^{-3}$
b) P2O5
c) H3PO4
d) $HPO_{4}^{2-}$

• 8. Redox Reactions and Electrochemistry - Quiz

1. Consider the following reaction, $xMnO_{4}^{-} + yC_{2}O_{4}^{2-} + zH^{+} → xMn^{2+} + 2yCO_{2} + \frac{z}{2}H_{2}O$
The values of x,y and z in the reaction are, respectively
a) 5,2 and 16
b) 2,5 and 8
c) 2,5 and 16
d) 5,2 and 8

2. The equivalent consuctance of NaCl at concentration C and at infinite dilution are λc and λ, respectively . The correct relationship between λc and λ is given as
a) λc = λ + (B)C
b) λc = λ - (B)C
c) λc = $\lambda_{\infty } - \left (B \right )\sqrt {C}$
d) λc = $\lambda_{\infty } + \left (B \right )\sqrt {C}$

• 9. Chemical Kinetics and Surface Chemistry - Quiz

1. The rate law for a reaction between the substances A and B is given by rate = k[A]n[B]m. On doubling the concentration of A and halving the concentration of B, the ratio of the new rate to the earlier rate of the reacion will be as
a) $\frac{1}{2^{m + n}}$
b) (m + n)
c) (n - m )
d) 2(n-m)

2. The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statements is not correct?
a) Coagulation in both sols can be brought about by electrophoresis
b) Mixing the sols has no effect
c) Sodium sulphate causes cosgulation in both sols
d) Magnesium chloride solution coagulation the gold sol more readily than the iron (III) hydroxide sol

• 10. Periodicity of Elements - Quiz

1. 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+

2. Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?
a) Ca < S < Ba < Se < Ar
b) S < Se < Ca < Ba < Ar
c) Ba < Ca < Se < S < Ar
d) Ca < Ba < S < Se < Ar

• 11. Principles and Processes of Metallurgy - Quiz

1. Cyanide process is used for the extraction of
a) barium
b) silver
c) boron
d) zinc

2. During the process of electrolytic refining of copper, some metals present as impurity settle as anode mud. These are
a) Fe and Ni
b) Ag and Au
c) Pb and Zn
d) Se and Ag

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

1. The type hybridisation of boron in diborane is
a) sp hybridisation
b) sp2 hybridisation
c) sp3 hybridisation
d) sp3d2 hybridisation

2. One mole of magnesium nitride on reaction with an excess of water gives
a) one mole of ammonia
b) one mole of nitric acid
c) two moles of ammonia
d) two moles of nitric acid

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

1. Which of the following groups of transition metals is called coinage metals?
a) Cu,Ag,Au
b) Ru,Rh,Pd
c) Fe,Co,Ni
d) Os,Ir,Pt

2. Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being
a) 4d orbitals more diffused than the 5f orbitals
b) lesser energy difference between 5f and 6d than between 4f and 5d orbitals
c) more energy difference between 5f and 6d than between 4f and 5d orbitals
d) more reactive nature of the actinoids than the lanthanoides

• 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. The smog is essentially caused by the presence of
a) O2 and O3
b) O2 and N2
c) oxides of sulphur and nitrogen
d) O3 and N2

• 15. General Organic Chemistry - Quiz

1. In the following benzyl/allyl system
R-CH=CH2 or
(R is alkyl group)
decreasing order of inductive effect is
a) (CH3)3C- > (CH3)2CH - > CH3CH2-
b) CH3CH2- > (CH3)2CH - > (CH3)3C-
c) (CH3)2CH- > CH3CH2- > (CH3)3C-
d) (CH3)2C- > CH3CH2 - > (CH3)3OH-

2. Which of the following compounds is not chiral?
a) 1-chloropentane
b) 2-chloropentane
c) 1-chloro-2-methyl pentane
d) 3-chloro-2-methyl pentane

• 16. Hydrocarbons and their Halogen Derivatives - Quiz

1. The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is
a) gammexane
b) DDT
c) freon
d) hexachloroethane

2. Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only isomer of mono substituted alkyl halide.?
a) Tertiary butyl chloride
b) Neopentane
c) Isohexane
d) Neohexane

• 17. Organic Compounds Containing Oxygen - Quiz

1. Phenyl magnesium bromide reacts with methanol to give
a) a mixture of anisol and Mg(OH)Br
b) a mixture of benzene and Mg(OMe)Br
c) a mixture of toulene and Mg(OH)Be
d) a mixture of phenol and Mg(Me)Br

2. Phenol is heated with a solution of mixture of KBr and KBrO3 . The major product obtained in the above reaction is
a) 2-bromophenol
b) 3-bromophenol
c) 4-bromophenol
d) 2,4,6-tribromophenol

• 18. Organic Compounds Containing Nitrogen - Quiz

1. Which one of the following is the strongest base in aqueous solution?
a) Trimethylamine
b) Aniline
c) Dimethylamine
d) Methylamine

2. On heating benzyl amine with chloroform and ethanolic KOH, product obtained by
a) benzyl alcohol
b) benzaldehyde
c) benzonitrile
d) benzyl isocyanide

• 19. Polymers and Biomolecules - Quiz

1. The term anomers of glucose refers to
a) isomers of glucose that differ in configuration at carbons one and four (C-1 and C-4)
b) a mixture of (D)-glucose and (L)-glucose
c) enantiomers of glucose
d) isomers of glucose that differ in configuartion at carbon one (C-1)

2. α-D(+)-glucoseand β-D-(+)-glucose are
a) conformers
b) epimers
c) anomers
d) enantiomers

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

1. Coordination compounds have great importance in biological systems. In this context , which of the following statements is incorrect?
a) Chlorophyll is green pigment in plant and contain calcium
b) Haemoglobin is the red pigment of blood and contains iron
c) Cyanocobalamin is vitamin B12 and contains cobalt
d) Carboxypeptidase-A is an enzyme and contains zinc

2. If Fe3+ and Cr3+ both in group III of qualitative analysis, then distinction ,can be made by
a) addition of NH4OH in the presence of NH4Cl when only Fe(OH)3 is prexipitated
b) addition of NH4OH in presence of NH4 when Ca(OH)3 and Fe(OH)3 both are precipitated and on adding Br2 walter and NaOH , Cr(OH)3 day dissolves
c) precipitate of Ce(OH)3 and Fe(OH)3 as obtained in (b) are treated with conc. HCl when only Fe(OH)3 dissolves
d) both (b) and (c)