PPSC CHEMISTRY SUBJECT SPECIALIST & SENIOR SUBJECT SPECIALIST past paper mcqs

PPSC CHEMISTRY SUBJECT SPECIALIST & SENIOR SUBJECT SPECIALIST past paper mcqs

>>Enzymes belong to which class of compound———–Proteins————— right answer)

>> The helical structure of protein is stabilized by ——–Hydrogen———-bond. right answer)

>> Enzymes have…Polypeptide…………………..unit

1. Polypeptide right answer)
2. HYDROCARBON

>> Function of enzymes in biological system is……….

1. Catalyze biochemical action right answer)

>> Night blindness is produce due to deficiency of …

1. ……..VITAMIN A right answer)

>> Zwitter ion exist in which of the following

1. a)Alanine right answer)
2. b)Glycine HCL
3. c) Both a and b
4. d)None

>> IR determine ——————–bond

1. a)kind of bond nature of bond right answer)
2. c)hydrocarbon

>> Marsh gas is ………………

1. …CH4 right answer)

>> Solvent used in IR Spectroscopy is………………..

1. a)CCL4 right answer)
2. B)CH30H
3. C)WATER
4. D)CH3CH2OH

>> 1700——1760 PEAK In IR Spectroscopy is…………

…Carbonyl group right answer)

>> NMR use ——————source of radiation

1. a)UV
2. B)Radio waves right answer)
3. micro waves
4. d)visible rays

>> Existence of nucleus is confirmed by………….. Millikian method or

1. Alpha scattering by thin metal foil right answer)

>> What is fase about electron

(Not conform but it should be d)

1. Electron is a particle
2. Wave is associated with electron
3. When electron jump from orbital its energy c..
4. oriented by magnetic field

>> Which one is occur in whole number always

1. Atomic number right answer)
2. Molecular weight
3. Equivalent weight

>> A metal has an electronic configuration is M+2 has 2,8,14 and its atomic weight is 56.the

number of neutron is ………………

1. 30) right answer)

>> Least soluble in Water Is

 

1. Ethano
2. l b. Phenol
3. Carboxylic acid
4. benzene right answer)

>> The EAN Value of Ni(CO)4 is

1. a)36 right answer)
2. b)54

>> The ration of C:Si in their neutron ration with atoic weight having 12 and 28 respectively

1. (3:7) right answer)

>> Phenolphthalein is colourless in acidic medium due to __

1. __Benzenoid form right answer)

>> The weakest base is

1. Hb)
2. Cl- right answer)
3. HCO3-
4. OH-

>> Which compound declourize KMnO4 solution but not give test with AgNO3 solution

1. Ethylene right answer)
2. Acetylene
3. Ethane

>> Which one of the following does not give Lassaignes test for nitrogen

1. Phenylhydrazine
2. Glycine
3. Urea
4. Azobenzene right answer)

>> which one the following compound does not explode:

1. trinitro toluene
2. b)2-amine toluene (I think this is not conform)

>>. Strongest oxidizing agent is supported by———-

1. Low dissociation energy
2. hIgh electron affinity right answer)
3. low ionization energy

>>  the order of oxidizing agent is

1. I<Br<Cl<F
2. inversion of cane sugar into glucose and fructose is ?(not conform)
3. a)slow process
4. fast process
5. b)spontaneous process
6. instaneous process

>>. rate of chemical reaction is———–when it proceed

1. decrease right answer)
2. increase

>> when reactants are added then rate of reaction is

1. (not conform)
2. decrease
3. increase right answer)

>> which one of the following metal has highest electrical conductivity

1. gold
2. silver right answer)
3. aluminium
4. copper

>> preparation of ice cream is

 

1. colloids
2. excessive cooling right answer)
3. Coagulation
4. peptization

>> colloids are example of —————equilibrium

1. homogenous equilibrium

heterogeneous equilibrium ( right answer)

1. suspension
2. none of these
3. pure water is nonconductor of electricity
4. water is neutral
5. water is almost unionized ( right answer)
6. water is completely ionized

>> which one of the following aqueous solution conductor of electricity

1. Glucose
2. HCl( right answer)

>> Which is correct statement (not confirm my answer is c)

1. Catalyst increase the rate of forward reaction
2. Catalyst increase the rate of backward reaction
3. Catalyst influence on the rate of forward reaction and backward reaction equally right answer)
4. Catalyst decrease the rate of forward reaction

>> Pick a right statement:

1. Order of reaction is in fraction ( right answer)

>> The unit for formation of ammonia from N2+3H………..>2NH3

2. Mol-2.lit2( right answer)

>> The unit of active mass is———–

1. Gram atom per litre ( right answer)
2. Gram molecule per litre
3. Gram litre

>> colloidal particles are

1. negative
2. positive
3. neutral (my answer is neutral not confirm)
4. may be positive or negative

>> who classify element first

1. lother meyer
2. doberiener
3. newlands
4. mendleevs

>> molecularity of reaction is always in ………………whole number ( right answer)

>> the chemical which destroy ozone layer is CFCl3 ( right answer)

>> Physisorption occur at —————temperature low ( right answer)

>> if dispersion medium is gas its example is

1. Aerosol( right answer)

>>. pressure vs temperature equation is called (not conform answer)

1. Langmuir equation
2. Fredluck equation
3. Bet equation
4. None of these

>> Resonation structure cannot be separated (right answer)

>> Nickel is use in the hydrogenation of vegetable ghee (right answer)

>> Colloids shows Brownian movement( right answer)

 

>>. Methyl group is 0rtho and p-direction because……..

1. (Not conform my answer is all ob above)
   1. E donating effect of methyl group inductively
   2. E donating effect of methyl group resonatingly
   3. E donating effect of methyl group hyperconjugation ( right answer)
   4. All of above

>> Chloro group is ortho and para but electron withdrawing ( right answer)

>> To avoid maximum yield For a Reversible reaction to occur

1. Glass vessel
2. Closed vessel( right answer)
3. Open vessel

>>. In benzene, there are —————type of carbon atom

1. One type ( right answer)
2. Two type
3. Three type
4. Four type
5. In benzene, the number of pi electron is
6. 3 e
7. 4e
8. 6e ( right answer)
9. 4e

>> In benzene , all carbon atoms are————-hybridization

1. Sp3
2. Sp2 ( right answer)
3. Sp
4. None

>> According to lechatlier principle in a reversible reaction between solid and liquid, the amount of

heat added

1. (Not conform answer)
2. Decrease the concentration of solid
3. increase the concentration of solid
4. Decrease the concentration of liquid
5. Decrease the concentration of liquid

>> The fastest reaction occur in which of the following:

1. Rusting of iron
2. Burning of coal
3. The AgCl formation by the reaction of AgNo3 and Nacl ( right answer)

>> The amount of energy required to separate nucleons is called

1. Ionization energy
2. Binding energy ( right answer)

>> The enthalpy of heat of formation of sodium ion from its atom is known as

1. Enthalpy of atomization
2. First ionization energy (not conform)
3. Enthalphy of combustion

>> The brown vapour is formed of which element when MnO2 and conc. H2SO4 is added in them

1. NO2 ( right answer)
2. CL2
3. Br2
4. I2
5. Stability of nucleus is due to
6. Proton and neutron ( right answer)
7. Proton and electron
8. Neutron and electron

>> Difference between particle mass and real mass is called…………

1. Mass defect ( right answer)

>> A gas has a volume of 2 litre at S.T.P at constant pressure, the new volume is 4 litre at which

temperature:

1. 50c
2. 100c

>> The difference between the crystalloids and colloids

1. Particle size ( right answer)
2. Colloidal size
3. Diffusion
4. True solution

>> The gas which shows deviation from ideal behavior is:

1. Helium
2. Hydrogen
3. Ammonia ( right answer)
4. Trichloro methane

>> Some substance shows scattering of light but they can pass through ordinary filter paper

is………….

1. Colloids ( right answer)
2. Suspension
3. True solution
4. None

>> In the lime kiln , CaCO3………………>CaO+CO2 proceed to complete because………..

1. CO2 ESCAPPE
2. CaO remove
3. Low Temperature
4. High Pressure

>> Which one of the following equation is not affected by change in pressure

1. 1/2N2+1/2O2………..>NO ( right answer)
2. P2O5……………..>P2O+O2
3. N2+3H2…………….>2NH3

>> A Reaction approaches go farthest completions

1. K=102
2. K=101
3. K=10
4. K=10-2

>> Isothermal thermal system is one in which

1. DELTA T=0 ( right answer)
2. DELTA E=W
3. V=0
4. E=0

>> Temperature of the system decreases in

1. adiabatic expansion ( right answer)
2. adiabatic compression

>> System in which no change in temperature is

1. Isochoric
2. isobaric
3. isothermic ( right answer)

>>. Cyclic structure of benzene is given by

1. Kekule( right answer)
2. Doberiener

>> Which is least soluble in water

1. Ethanol
3. Benzene ( right answer)
4. Benzoic acid
5. Phenol

>> Heterogeneous catalysis is based on

1. Adsorption ( right answer)
   1. Absorption
   2. Sorption
   3. Desorption

>> Entropy of the unive rse is

1. Always increasing ( right answer)
2. Decreasing
3. Constant

>> Which indicator is not used in conical flask

1. Self indicator
2. External indicator ( right answer)
3. Internal indicator
4. Mixed indicator

>> Toluene is prepared from benzene

1. Fridel craft reaction ( right answer)
2. Perkin reaction
3. Wurtz reaction

>> Catalyst used in fridel craft alkylation is

1. AlCl3 ( right answer)
2. BFCl3

>> Order of reaction is………

1. Can be determined from equation

Can be determined from experiment ( right answer)

>> Oxidation number of P in KH2PO2 IS

1. +1 ( right answer)
2. +3
3. +5
4. +2

>> Molten KCl conduct electricity because of

1. Free ions ( right answer)
2. Free electron

>> which individual units loose identity

1. Complex salts right answer)
2. Simple salts
3. Compound salts
4. Double Salt

>> When a multidemential ligand is surrounded it is known as

Coordination sphere

Coordination complex

>> Group no. represents

1. Same electronic configuration
2. same number of electron in valance shell( right answer)
3. Chelates ( right answer)

>> Entropy decreases in melting of ice rusting of iron

>> In this reaction 6NaOH+3Cl2……………5NaCl+NaClO3+3H2O

1. Chlorine is reduced
2. Chlorine is oxidized
3. Disproportionate reaction

>> Aqueous solution is electrical conductor MgCl2

>> According to lewis concept,

1. Bases are electron pair donor

>> According to lowry-bronsted concept

1. Bases are proton acceptor

>> Which one of the following aqueous solution of oxide and chloride give same test with litmus

solution.

1. Phosphorous
2. Sodium
3. Magnesium

>> The element of group 1B is known as coinage metal.

>> Oxidation of which gives positive DNP but not Fehling’s test

1. CH3CH2CH2CH2OH
2. CH3CH (OH)CH2CH3
3. CH3CH (CH3)CH2CH2OH
4. (CH3)3COH

>> Product of hydrolysis of CH3CO2C3H7 with NaOH gives

1. CH3COONa +C3H7OH

>> Flourescene, rhodamine, are example of—————indicators.

1. Acid base indicator
2. Adsorption indicator
3. Absorption indicator

>> Evaporation causes a change in entropy………

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PPSC CHEMISTRY SENIOR SUBJECT SPECIALIST past paper mcqs

PPSC CHEMISTRY SUBJECT SPECIALIST past paper mcqs

PPSC CHEMISTRY SUBJECT SPECIALIST & SENIOR SUBJECT SPECIALIST past paper mcqs