11th Class Chemistry guess paper 2018

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Chemistry MCQs Guess Paper 11th Class 2018

When HCC is added to H2S aqueous solution its ionization
(A) Increases
(B) Decreases
(C) Remains constant
(D) First increases then decreases

Which of the hydrogen halides has the highest percentage ionic character
(B) HBr
(C) HF
(D) HI

An excess of aqueous AgNO3 is added to aqueous BaCt2 solution. The precipitate is removed off The filtrate contains
(A) Ag+ and NO3 ions
(B) Ag+, Ba+2 and NO3- ions
(C) Ba+2 and NO3- only
(D) Ba+2, NO3 and Cr ions

Which is not a state function
(A) Energy
(B) Heat
(C) Temperature
(D) Volume

The hybridization of carbon in C2H4 is
(A) SP3
(B) SP2
(C) SP
(D) dSP3

The molar volume of CO2 is maximum at
(B) 127°C and 1 atm
(C) 0°C and 2 atm
(D) 273°C and 2 atm

One calorie is equivalent to
(A) 0.4184 J
(B) 41.84 J
(C) 4.184 J
(D) 418.4 J

The volume occupied by 1.4 g of N2 at S.T.P is
(A) 2.24 dm3
(B) 22.4 dm3
(C) 1.12 dm3
(D) 112 dm3

Which of the following has zero dipole moment
(A) NH3
(B) BF3
(C) H2O
(D) H2S

The absolute zero is
(A) Attainable
(B) May be attainable
(C) Unattainable
(D) May not be attainable

In endothermic reactions the heat content of the
(A) Product is more than that of reactantsV
(B) Reactants is more than that of products
(C) Both I and II,
(D) Reactants and products are equal

Standard enthalpies are measured at
(A) 273k
(B) 298k
(C) 373k
(D) All of these

Which one of the following is a pseudo solid
(A) CaF2
(B) NaCC
(C) Borax
(D) Glass

The maximum number of electrons in a sub-shell is given by
(A) 2C+1
(B) 2C—1
(C) 2(2C+1)
(D) 2(2C—1)

When value is small, the equilibrium position lies to
(A) Left
(B) Right
(C) Equilibrium
(D) None

The concentrations of reactants and products at equilibrium are
(A) Equal
(B) Maximum
(C) Minimum
(D) Constant

When 50% reactants in a reversible reaction are converted into a product, the value of equilibrium constant Kc is
(A) 2
(B) 1
(C) 3
(D) 4

K-series have wave-length
(A) Longer
(B) Smaller
(C) Same
(D) Different

Properties of waves are
(A) Wave length
(B) Wave number
(C) Frequency
(D) All

The wave number of the light emitted by a certain is 2 x 106 m-1. The wavelength of this light will be
(A) 500 nm
(B) 500 m
(C) 200 nm
(D) 5 x 107 m

The number of fundamental ways of transferring energy into or out of system is
(A) One
(B) Two
(A) Three
(A) Four

The enzyme used for hydrolysis of urea is
(A) Invertase
(B) Urease
(C) Lipase
(D) Zymase

If the salt bridge is not used between two half cells, the voltage
(A) Decreases rapidly
(B) Decreases slowly
(C) Does not change
(D) Drops to zero

Silver has isotopes: (9, 16, 17, 18)

Whith statement is not correct about galvanic cell?
(A) Anode is negatively charged
(B) Reduction occurs at anode
(C) Cathode is positively charged
(D) Reduction occurs at cathode

Which statement is not true?
(A) Isotopes with even atomic masses are comparatively abundant
(B) Isotopes with odd atomic masses are comparatively abundant
(C) Isotopes even atomic masses and even atomic numbers are comparatively abundant
(D) Isotopes with even atomic masses and odd atomic numbers are comparatively abundant

Which statement about the following equilibrium is correct 2S02(g) + 02(0….77-2S03(g) AH = — 188.3 KJ/ mole
(A) The value of Kp falls with rise in temperature
(B) The value of Kp falls with increase in pressure
(C) Adding V205 catalyst increases the equilibrium yield of sulphur trioxide
(D) The value Kp = Ke

The mass of two moles of electrons is
(A) 1.10 mg
(B) 1.008 mg
(C) 0.184 mq
(D) 1.673 mg

A substance which makes the catalyst more effective is called
(A) Inhibitor
(B) Retarder
(C) Promoter
(D) Auto Catalyst

2.7 g of At will react completely with how much mass of 02 to produce At203
(A) 0.8 g of oxygen
(B) 1.6 g of oxygen
(C) 3.2 g of oxygen
(D) 2.4 g of oxygen

0.1 mole of solute dissolved in 100g of the solvent will be
(A) 0.1 molal
(B) 1.0 molal
(C) 0.5 molal
(D) None of these

Mass of one mole of electron is
(A) 1.008 mg
(B).0.55 mg
(C) 1.84 mg
(D) 1.673mg

Solvent extraction method is particularly useful technique for separation when the product to be separated is
(A) Non-volatile or thermally unstable
(B) Volatile or thermally stable
(C) Non-volatile or thermally stable
(D) Volatile or thermally unstable

Law of mass action was derived by Gulberg and wage in
(A) 1909
(B) 1906
(C) 1846
(D) 1864

Solvent extraction is an equilibrium process and it is controlled by
(A) Law of mass action
(B) Distribution law
(C) The amount of solvent used
(D) The amount of solute

In solvent extraction the law applied is
(A) Law of mass action
(B) Distribution law
(C) Coulomb’s law
(D) Boyle’s law

London dispersion forces are the only forces present among the
(A) Molecules of water in liquid state
(B) Atoms of helium in gaseous state at high temperature
(C) Molecules of solid iodine
(D) Molecules of hydrogen chloride gas

Solvent extraction is a process
(A) Exothermic
(B) Endothermic
(C) Equilibrium
(D) Non-equilibrium

The molecules of CO2 in dry ice form the
(A) Ionic crystals
(B) Covalent crystals
(C) Molecular crystals
(D) Any type of crystals

The most stable elements are
(A) Halogens
(B) Lithium family
(C) Noble gases
(D) None of these

Which of the following molecules has zero dipole moment?
(A) NH3
(B) CFICei
(C) H2O
(D) BF3

Bond angle (I) in case of ammonia molecule is
(A) 105°
(B) 107.5°
(C) 120°
(D) 180°

In dry ice CO2 molecules form
(A) Ionic crystals
(B) Covalent crystals
(C) Molecular crystals
(D) Any type of crystals

The number of bonds in oxygen molecule is
(A) One a and one 7
(B) One a and two 7
(C) Three sigma only
(D) Two sigma only

Escape out of gas molecules one by one through tiny hole is
(A) Diffusion
(B) Effusion
(C) Osmosis
(D) All of these

Largest number of molecules are in

(A) 3.6 gmH20
(B) 4.8 gm C2H5OH
(C) 2.8 gm CO
(D) 5.8 gm N205

Which molecule has zero dipole moment?
(A) NH3
(B) CHC 3
(C) H2O
(D) BF3

Quantum number values for 21 orbitals are
(A) n = 2, = 1
(B) n = 1, = 2
(C) n = 1, =0
(D) n = 2, t =0

An orbital which is spherical and symmetrical is
(A) s-orbital
(B) p-orbital
(A) d-orbital
(A) f-orbital

The four equivalents SP3 hybrid orbitals in space are at an angle of
(A) 120°
(B) 107.5°
(C) 104.5°
(D) 109.5°

Cathode in NICAD is
(A) Ag2O
(B) N102
(C) Cd
(D) Zn

The nature of positive rays depends on
(A) The nature of electrode
(B) The nature of discharge tube
(C) The nature of residual gas
(D) The temperature

Cathode rays strike alumina and produce a colour
(A) Red
(B) Blue
(C) Yellow
(D) Green

The —e value for the positive rays is maximum for
(A) Hydrogen
(B) Helium
(C) Oxygen
(D) Nitrogen

Positive ions are called
(A) cations
(B) Annions
(C) Molecules
(D) Hydrated ions

An ionic compound A+ 13- is most likely to be formed when
(A) The ionization energy of A is high and electron affinity of B is low
(B) The ionization energy of A is low and electron affinity of B is high
(C) Both the ionization energy of A and electron affinity of B are high
(D) Both the ionization energy of A and electron affinity of B are low

CsF has ionic character
(A) 60%
(B) 80%
(C) 92%
(D) 100%

Which of the hydrogen halide has the highest percentage of ionic character
(A) HI
(B) HBr
(D) HF

Ionic product of water (Kw) increases when temperature increases from 0°C to 100°C
(A) 25 times
(B) 75 times
(C) 55 times
(D) 65 times

Which species has unpaired electrons in anti bonding molecular orbitals?
(A) 022+
(B) 022-
(C) B2
(D) F2

Formation of chemical bond takes place when
(A) Energy is absorbed
(B) Forces of repulsion overcome forces of attraction
(C) Forces of attraction are equal to forces of repulsion
(D) Forces of attraction overcome forces of repulsion.

For a given process the heat changes at constant pressure (qp) and at constant volume (qv) are related to each other as
(A) qp = qv
(B) qp < qv (C) qp >
(D) qp c-1-2L

Which solution has the highest boiling point?
(A) 5.85% solution of sodium chloride
(B) 18.00% solution of glucose
(C) 6.00% solution of urea
(D) all have the same boiling point

The change in heat energy of a chemical reaction at constant temperature and pressure is called
(A) Enthalpy change
(B) Heat of sublimation
(C) Bond energy
(D) Internal energy change

The boiling point of water at the top of Mount Everest is
(A) 59°C
(B) 69°C
(C) 83°C
(D) 75°C

Oxidation state of chromium in K2CrO4 is
(A) 5
(B) 6
(C) 3
(D) 7

In order to mention the boiling point of water at 110°C, the external pressure should be
(A) Between 760 torr and 1200 torni
(B) Between 200 torr and 760 tor
(C) 100 torr
(D) Any value of pressure

The oxidation number of Ce in HCtat is
(A) +2
(B) +3
(C) +5
(D) +7-

Oxidation No. of oxygen in OF2 is
(A) Zero
(B) —1
(C) +2
(D) —1

In H2SO4 the oxidation number of S is
(A) +2
(B) +6
(C) +8
(D) +4

The oxidation number of chromium in K2Cr2O7 is
(A) 14
(B) 12
(C) 6
(D) 13

Acetone and chloroform are soluble in each other due to
(A) Intermolecular hydrogen bonding
(B) Ion-dipole interaction
(C) Instantaneous dipole
(D) All of these

The unit of the rate constant is the same as that of the rate of reaction in
(A) First order reaction
(B) Second order reaction
(C) Third order reaction
(D) Zero order reaction

The solubility product of AgGe is 2.0 x 10-10 mole2 dm-6 the maximum concentration of Ag ions in the solution is
(A) 2.0 x 10 Ic mole dm-3
(B) 1.41 x 10-5 mole dm-3
(A) 1.0 x 10-1° mole
(A) 4.0 x 10-20 mole dm-1

The substance used for decolourization of undesirable colour in a crystalline substance is
(A) H2SO4
(B) Silica gel
(C) NaNO3
(D) Animal charcoal

The existence of a compound in more than one crystalline forms is called:
(A) Anisotropy
(B) Isomorphism
(C) Allotropy
(D) Polymorphism

For the reaction NaOH + HC 2 + H2O NaCI + H2O, the change in enthalpy is called
(A) Heat of reaction
(B) Heat of formation
(C) Heat of neutralization
(D) Heat of combustion

Isotopes differ in
(A) Properties which depend upon mass
(B) Arrangement of electrons in orbitals
(C) Chemical properties
(D) The extent to which they may be effected in electromagnetic field

How many isotopes are present in palladium?
(A) Four
(B) Five
(C) Six
(D) Seven

The geometry of ethane is
(A) Trigonal planar
(B) Linear
(C) V-shaped
(D) Tetrahedral

A solution of glucose is 10% w/v. The volume in which 1 gram mole of it is dissolved will be
(A) 1 dm3
(B) 1.8 dm3
(C) 200 cm3
(D) 900 cm3

The value of Planck’s constant is
(A) 6.62 x 1 J.S.
(B) 6.62 x 10-27 J.S.
(C) 6.62 x 10-31 J.S.
(D) 6.62 x 10-21J.S.

The velocity of photon is
(A) Independent of the wavelength
(B) Depends on its wavelength
(C) Equal to square of its amplitude
(D) Depends on its source

The term pH was introduced by
(A) Henderson
(B) Sorenson
(C) Goldstein
(D) Thomson

Stronger the oxidizing agent greater is the
(A) Oxidation potential
(B) Reduction potential
(C) Redox potential
(D) E.M.F. of cell

The pH of le mol d.-3. of an aqueous solution of H2SO4 is
(A) 3.0
(B) 2.7
(C) 2.0
(D) 1.5

The pH of 10-3 mol drn-3 of an aqueous solution of H2SO4 is
(A) 3.0
(B) 2.7
(C) 2.0
(D) 1.5

pH of pure water is
(A) 4.4
(B) 5.4
(C) 7.0
(D) 8.0

The pH of 10-3 molar H2SO4 solution is
(A) 3.0
(B) 2.7
(C) 2.0
(D) 1.5

Water may boil at 120°C when external pressure is
(A) 369 torr
(B) 700 torr
(C) 760 torr
(D) 1489 torr

Pressure remaining constant at which temperature of the volume Of a gas will become twice of what it is at 0°C
(A) 546°C
(B) 200°C
(C) 546 K
(D) 273 K

Dissolves in water in the presence of KI due to the formation of
(A) 12
(B) 1-
(C) 13
(D) 14

One mole of SO2 consists of
(A) 6.02 x 1023 atoms of oxygen
(B) 18.1 x 1023 molecules of SO2
(C) 6.02 x 1023 atoms of sulphur
(D) 4 gram atoms of SO2

The mass of one mole of electrons is
(A) 1.008 mg
(B) 0.55 mgV
(C) 0.184 mg
(D) 1.673 mg

The volume of one mole CO2 is maximum at
(A) S.T.P
(B) 127° and 1 atm.
(C) 0°C and 2 atm.
(D) 273°C and 2 atm.

Percentage of oxygen in water is
(A) 80%
(B) 88.89%
(C) 8.8 %
(D) 9.8%

The number of moles of CO2 which contains 8.0 g of oxygen
(A) 0.25
(B) 0.50
(C) 0.75
(D) 1.0

When water freezes at 0°C, its density decreases due to
(A) Empty spaces present in the structure of ice
(B) Cubic structure of ice
(C) Change of bond lengths
(D) Change of bond angles

Diamond is a bad conductor of electricity because
(A) It has a tight structure
(B) It has a high density
(C) There is no free electron present in the crystal of diamond to conduct electricity
(D) It is transparent to light

Plasma is conductor Of electricity
(A) Bad
(B) Poor
(C) Good
(D) None

The crystal of diamond is
(A) Ionic
(B) Covalent
(C) Molecular
(D) Metallic

Total number of spectral regions is spectrum is
(A) 4
(B) 6
(C) 7
(D) 8

Splitting of spectral lines when atoms are subjected to strong electric field is called
(A) Zeeman effect
(B) Stark effect
(C) photoelectric effect
(D) Compton effect

In ground state of an atom the electrm, is present
(A) In the nucleus
(B) In the second shell
(C) Nearest to the nucleus
(D) Farthest from the nucleus

The number of carbon atoms in 22.0 g of CO2 is
(A) 3.01 x 1023
(B) 6.02 x 1023
(C) 3.01 x 1022
(D) 6.02 x 1022

Bohr model of atom is contradicted by
(A) Plank’s quantum theory
(B) Dual nature of matter
(C) Heisenberg’s uncertainty principle
(D) All of these

An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ions in the filtrate?
(A) Ag+ and Ba2+ and NO3-
(B) Ag+ and NO3- only
(C) Ba2+ and NO3- only
(D) Ba2+ and NO3- and Ce-

If a strip of Cu metal is placed in a solution of FeSO4
(A) Cu will be deposited
(B) Fe is precipitated out
(C) Cu and Fe both dissolve
(D) no reaction occurs

Which of the following is purified by submission
(A) Naphtalene
(B) Benzoic acid
(C) Ammonium chloride
(D) All of these

Dry Ice (Solid CO2) is art example of solid
(A) Covalent
(B) Molecular
(C) Ionic
(D) Metallic

In zero order reaction, the rate is independent of
(a) Temperature of reaction
(B) Concentration of reactants
(C) Concentration of products
(D) None of these

Specific rate constant is equal to rate of reaction, when concentration of reactants are
(A) Zero
(B) Four
(C) Three
(D) Unity

The rate of reaction
(A) Increases as the reaction proceeds
(B) Decreases as the reaction proceeds
(C) Remains the same as reaction proceeds
(D) May decrease or increase as the reaction proceeds

Glycerine decomposes at its
(A) Melting point
(B) Boiling point
(C) Freezing point
(D) Critical point

The comparative rates at which the solutes move in paper chromatography, depend upon
(A) The size of paper
(B) Rf values of solutes
(C) Temperature of experiment
(D) Size of the chromatographic tank used

Maximum no. of electrons in an orbital is
(A) 6
(B) 10
(C) 14
(D) 2

The amount of energy released by absorbing electron in the valence shell is
(A) Ionization energy
(B) Electron affinity
(C) Electro negativity
(D) Atomic radius

When 6 d orbital is complete the entering electron goes to
(A) 7 f
(B) 7 s
(C) 7 p
(D) 7 d

Orbitals having same energy are called
(A) Hybrid orbitals
(B) Valence orbitals
(C) Degenerate orbitals
(D) d-orbitals

Molarity of pure water is
(A) 1.0
(B) 18.0
(C) 55.5V
(D) 6.0

Gooch crucible is made of
(A) Clay
(B) Asbestos
(C) Porcelain
(D) Iron

Which gas will diffuse more rapidly
(B) NH3
(C) CO2
(D) SO2

A real gas obeying van der Waal’s equation will resemble ideal gas if
(A) Both ‘a’ and `b’ are large
(B) Both ‘a’ and `b’ are small
(C) A is small and b is large
(D) a is large and b is small

Transition temperature of tin is
(A) 95.5°C
(B) 13.2°C
(C) 0°C
(D) 128.5°C

If “a” and “b” are zero for certain gas then gas is
(A) Ideal
(B) Real
(C) Non-ideal
(D) May be any diatomic gas

In endothermic reaction tH is taken as
(A) Positive
(B) Negative
(C) Zero
(D) May be any value

Amorphous means
(A) Arranged
(B) Ordered
(C) Shaped
(D) Shapeless

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