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
- Polypeptide right answer)
- HYDROCARBON
>> Function of enzymes in biological system is……….
- Catalyze biochemical action right answer)
>> Night blindness is produce due to deficiency of …
- ……..VITAMIN A right answer)
>> Zwitter ion exist in which of the following
- a)Alanine right answer)
- b)Glycine HCL
- c) Both a and b
- d)None
>> IR determine ——————–bond
- a)kind of bond nature of bond right answer)
- c)hydrocarbon
>> Marsh gas is ………………
- …CH4 right answer)
>> Solvent used in IR Spectroscopy is………………..
- a)CCL4 right answer)
- B)CH30H
- C)WATER
- D)CH3CH2OH
>> 1700——1760 PEAK In IR Spectroscopy is…………
…Carbonyl group right answer)
>> NMR use ——————source of radiation
- a)UV
- B)Radio waves right answer)
- micro waves
- d)visible rays
>> Existence of nucleus is confirmed by………….. Millikian method or
- Alpha scattering by thin metal foil right answer)
>> What is fase about electron
(Not conform but it should be d)
- Electron is a particle
- Wave is associated with electron
- When electron jump from orbital its energy c..
- oriented by magnetic field
>> Which one is occur in whole number always
- Atomic number right answer)
- Molecular weight
- 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 ………………
- 30) right answer)
>> Least soluble in Water Is
- Ethano
- l b. Phenol
- Carboxylic acid
- benzene right answer)
>> The EAN Value of Ni(CO)4 is
- a)36 right answer)
- b)54
>> The ration of C:Si in their neutron ration with atoic weight having 12 and 28 respectively
- (3:7) right answer)
>> Phenolphthalein is colourless in acidic medium due to __
- __Benzenoid form right answer)
>> The weakest base is
- Hb)
- Cl- right answer)
- HCO3-
- OH-
>> Which compound declourize KMnO4 solution but not give test with AgNO3 solution
- Ethylene right answer)
- Acetylene
- Ethane
>> Which one of the following does not give Lassaignes test for nitrogen
- Phenylhydrazine
- Glycine
- Urea
- Azobenzene right answer)
>> which one the following compound does not explode:
- trinitro toluene
- b)2-amine toluene (I think this is not conform)
>>. Strongest oxidizing agent is supported by———-
- Low dissociation energy
- hIgh electron affinity right answer)
- low ionization energy
>> the order of oxidizing agent is
- I<Br<Cl<F
- inversion of cane sugar into glucose and fructose is ?(not conform)
- a)slow process
- fast process
- b)spontaneous process
- instaneous process
>>. rate of chemical reaction is———–when it proceed
- decrease right answer)
- increase
>> when reactants are added then rate of reaction is
- (not conform)
- decrease
- increase right answer)
>> which one of the following metal has highest electrical conductivity
- gold
- silver right answer)
- aluminium
- copper
>> preparation of ice cream is
- colloids
- excessive cooling right answer)
- Coagulation
- peptization
>> colloids are example of —————equilibrium
- homogenous equilibrium
heterogeneous equilibrium ( right answer)
- suspension
- none of these
- pure water is nonconductor of electricity
- water is neutral
- water is almost unionized ( right answer)
- water is completely ionized
>> which one of the following aqueous solution conductor of electricity
- Glucose
- HCl( right answer)
>> Which is correct statement (not confirm my answer is c)
- Catalyst increase the rate of forward reaction
- Catalyst increase the rate of backward reaction
- Catalyst influence on the rate of forward reaction and backward reaction equally right answer)
- Catalyst decrease the rate of forward reaction
>> Pick a right statement:
- Order of reaction is in fraction ( right answer)
>> The unit for formation of ammonia from N2+3H………..>2NH3
- Mol-2.lit2( right answer)
>> The unit of active mass is———–
- Gram atom per litre ( right answer)
- Gram molecule per litre
- Gram litre
>> colloidal particles are
- negative
- positive
- neutral (my answer is neutral not confirm)
- may be positive or negative
>> who classify element first
- lother meyer
- doberiener
- newlands
- 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
- Aerosol( right answer)
>>. pressure vs temperature equation is called (not conform answer)
- Langmuir equation
- Fredluck equation
- Bet equation
- 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……..
- (Not conform my answer is all ob above)
- E donating effect of methyl group inductively
- E donating effect of methyl group resonatingly
- E donating effect of methyl group hyperconjugation ( right answer)
- All of above
>> Chloro group is ortho and para but electron withdrawing ( right answer)
>> To avoid maximum yield For a Reversible reaction to occur
- Glass vessel
- Closed vessel( right answer)
- Open vessel
>>. In benzene, there are —————type of carbon atom
- One type ( right answer)
- Two type
- Three type
- Four type
- In benzene, the number of pi electron is
- 3 e
- 4e
- 6e ( right answer)
- 4e
>> In benzene , all carbon atoms are————-hybridization
- Sp3
- Sp2 ( right answer)
- Sp
- None
>> According to lechatlier principle in a reversible reaction between solid and liquid, the amount of
heat added
- (Not conform answer)
- Decrease the concentration of solid
- increase the concentration of solid
- Decrease the concentration of liquid
- Decrease the concentration of liquid
>> The fastest reaction occur in which of the following:
- Rusting of iron
- Burning of coal
- The AgCl formation by the reaction of AgNo3 and Nacl ( right answer)
>> The amount of energy required to separate nucleons is called
- Ionization energy
- Binding energy ( right answer)
>> The enthalpy of heat of formation of sodium ion from its atom is known as
- Enthalpy of atomization
- First ionization energy (not conform)
- Enthalphy of combustion
>> The brown vapour is formed of which element when MnO2 and conc. H2SO4 is added in them
- NO2 ( right answer)
- CL2
- Br2
- I2
- Stability of nucleus is due to
- Proton and neutron ( right answer)
- Proton and electron
- Neutron and electron
>> Difference between particle mass and real mass is called…………
- 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:
- 50c
- 100c
>> The difference between the crystalloids and colloids
- Particle size ( right answer)
- Colloidal size
- Diffusion
- True solution
>> The gas which shows deviation from ideal behavior is:
- Helium
- Hydrogen
- Ammonia ( right answer)
- Trichloro methane
>> Some substance shows scattering of light but they can pass through ordinary filter paper
is………….
- Colloids ( right answer)
- Suspension
- True solution
- None
>> In the lime kiln , CaCO3………………>CaO+CO2 proceed to complete because………..
- CO2 ESCAPPE
- CaO remove
- Low Temperature
- High Pressure
>> Which one of the following equation is not affected by change in pressure
- 1/2N2+1/2O2………..>NO ( right answer)
- P2O5……………..>P2O+O2
- N2+3H2…………….>2NH3
>> A Reaction approaches go farthest completions
- K=102
- K=101
- K=10
- K=10-2
>> Isothermal thermal system is one in which
- DELTA T=0 ( right answer)
- DELTA E=W
- V=0
- E=0
>> Temperature of the system decreases in
- adiabatic expansion ( right answer)
- adiabatic compression
>> System in which no change in temperature is
- Isochoric
- isobaric
- isothermic ( right answer)
>>. Cyclic structure of benzene is given by
- Kekule( right answer)
- Doberiener
>> Which is least soluble in water
- Ethanol
- Benzene ( right answer)
- Benzoic acid
- Phenol
>> Heterogeneous catalysis is based on
- Adsorption ( right answer)
- Absorption
- Sorption
- Desorption
>> Entropy of the unive rse is
- Always increasing ( right answer)
- Decreasing
- Constant
>> Which indicator is not used in conical flask
- Self indicator
- External indicator ( right answer)
- Internal indicator
- Mixed indicator
>> Toluene is prepared from benzene
- Fridel craft reaction ( right answer)
- Perkin reaction
- Wurtz reaction
>> Catalyst used in fridel craft alkylation is
- AlCl3 ( right answer)
- BFCl3
>> Order of reaction is………
- Can be determined from equation
Can be determined from experiment ( right answer)
>> Oxidation number of P in KH2PO2 IS
- +1 ( right answer)
- +3
- +5
- +2
>> Molten KCl conduct electricity because of
- Free ions ( right answer)
- Free electron
>> which individual units loose identity
- Complex salts right answer)
- Simple salts
- Compound salts
- Double Salt
>> When a multidemential ligand is surrounded it is known as
Coordination sphere
Coordination complex
>> Group no. represents
- Same electronic configuration
- same number of electron in valance shell( right answer)
- Chelates ( right answer)
>> Entropy decreases in melting of ice rusting of iron
>> In this reaction 6NaOH+3Cl2……………5NaCl+NaClO3+3H2O
- Chlorine is reduced
- Chlorine is oxidized
- Disproportionate reaction
>> Aqueous solution is electrical conductor MgCl2
>> According to lewis concept,
- Bases are electron pair donor
>> According to lowry-bronsted concept
- Bases are proton acceptor
>> Which one of the following aqueous solution of oxide and chloride give same test with litmus
solution.
- Phosphorous
- Sodium
- Magnesium
>> The element of group 1B is known as coinage metal.
>> Oxidation of which gives positive DNP but not Fehling’s test
- CH3CH2CH2CH2OH
- CH3CH (OH)CH2CH3
- CH3CH (CH3)CH2CH2OH
- (CH3)3COH
>> Product of hydrolysis of CH3CO2C3H7 with NaOH gives
- CH3COONa +C3H7OH
>> Flourescene, rhodamine, are example of—————indicators.
- Acid base indicator
- Adsorption indicator
- Absorption indicator
>> Evaporation causes a change in entropy………
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