Chemistry is the branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances.Chemistry is the scientific discipline involved with compounds composed of atoms, i.e. elements, and molecules, i.e. combinations of atoms, their composition, structure, properties, behavior and the changes they undergo during a reaction with other compounds. Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds.In the scope of its subject, chemistry occupies an intermediate position between physics and biology. It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level.Chemistry was preceded by its protoscience, alchemy, which is an intuitive but non-scientific approach to understanding the constituents of matter and their interactions. Just follow the Mcqs online quiz being dispatched over here with respect to your preparation for entry admission test NTS PPSC OTS PTS and missllenous job exams simultaneously.
Here we have large collection of Chemistry Mcqs for all Students and jobs test preparation purpose. These Chemistry Mcqs will be updated on daily basis and added more multiple choice question about Chemistry frequently.You can prepare your Chemistry Subject for different classes like 9th class, 10th class ,11th class 12th class exams, Entry Test like MCAT NTS ,OTS ,PTS ,BTS, GTS, Jobs Test,Recruitment Test like PPSC CSS FPSC SPSC KPPSC and interviews here.
Chemistry Mcqs Online With Answers for NTS PPSC Entry Test Classes
Chemistry
Chemistry Mcqs with Answers solved online.
The height of the peak in mass spectrum shows?
A. Number of isotopes
B. Mass Number
C. Relative abundance
D. Number of protons
Right Answer: C. Relative abundance
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The Friedel craft reaction will be slowest for?
A. Benzene
B. Nitrobenzene
C. Toluene
D. Phenol
Right Answer: B. Nitrobenzene
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Which one of the following is not a pollutant?
A. CO2
B. CO
C. NO2
D. SO2
Right Answer: A. CO2
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Which ester is used as orange flavor?
A. Amylacetate
B. Benzylacetate
C. Acetyl chloride
D. Carboxylic acid
Right Answer: C. Acetyl chloride
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One mole of SO2 contains?
A. 6.002 x 1023 atoms of Oxygen
B. 6.002 x 1023 atoms of Sulphur
C. 18.1 x 1023 molecules of SO2
D. 4 g atoms of SO2
Right Answer: B. 6.002 x 1023 atoms of Sulphur
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When HCl gas is passed through saturated solution of rock salt, the solubility of NaCl?
A. Increases
B. May increases or decreases
C. Decreases
D. None of these
Right Answer: C. Decreases
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When two amino acids are condensed releasing a water molecule, HN – C=O linkage thus formed is called?
A. α helix linkage
B. Peptide linkage
C. Glycosidic linkage
D. All of the above
Right Answer: B. Peptide linkage
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. In a given system, water and ice are in equilibrium, if the pressure is applied to the above system then?
A. More ice is formed
B. Amount of ice and water will remain the same
C. More ice is melted
D. Bot a and b
Right Answer: C. More ice is melted
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Which of the following has maximum reactivity in nucleophilic substitution reactions?
A. Formaldelyde
B. Acetaldehyde
C. Propanone
D. All of these
Right Answer: A. Formaldelyde
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Carboxylic acids react with active metals (Na, K, Ca and Mg) to form their salt and?
A. H2O
B. H2O and CO2
C. CO2 only
D. H2 gas
Right Answer: D. H2 gas
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The cell in which electrical energy is converted into chemical energy is?
A. Galvanic cell
B. Electrolytic cell
C. Volatic cell
D. All of these
Right Answer: B. Electrolytic cell
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Polyester resins are used in?
A. Plastic
B. Food Container
C. Floor covering
D. Clothing and water tanks
Right Answer: D. Clothing and water tanks
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10g NaOH is dissolved in 1000g water. The molality of NaOH is?
A. 1m
B. 0.5m
C. 4m
D. 0.25m
Right Answer: D. 0.25m
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In contact process SO3 manufacturing is favour at low temperature but in actual practice the reaction is carried out at 400-600°C the reason is that?
A. At high temperature reaction will be fast
B. Rate of forward reaction is low
C. Equilibrium will established later
D. Separation is easy at high temperature
Right Answer: B. Rate of forward reaction is low
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Elimination bimolecular reactions involve?
A. 1st order kinetics
B. Zero order kinetics
C. 2nd order kinetics
D. None of these
Right Answer: C. 2nd order kinetics
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What sis the colour of Mn+2?
A. Pink
B. Violet
C. Purple
D. Green
Right Answer: A. Pink
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Which of the following fertilizer provides to soil 75% neutrients?
A. Urea
B. Calcium superphosphate
C. Diammonium phosphate
D. Pottasium nitrate
Right Answer: C. Diammonium phosphate
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Standard hydrogen electrode has an arbitrary fixed potential of?
A. 0 V
B. 0.1 V
C. 1.0 V
D. 0.001 V
Right Answer: A. 0 V
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All noble gases are?
A. Mono-atomic
B. Tri-atomic
C. Di-atomic
D. Polyatomic
Right Answer: A. Mono-atomic
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Alkane nitrilescan be prepared by treating alkyl halide with?
A. Alcohol
B. Potassium cyanide
C. Alcoholic potassium cyanide
D. Water
Right Answer: C. Alcoholic potassium cyanide
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Which one metal shows maximum oxidation state?
A. Mn
B. Ag
C. Cr
D. Hg
Right Answer: A. Mn
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Which statement is incorrect about formation of ester?
A. When carboxylic acids are heated with alcohols esters are formed
B. Esters have fruity smell
C. Esters are used as artificial flavors
D. Ester are formed in the presence of NaOH
Right Answer: D. Ester are formed in the presence of NaOH
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Most of the reactions which give stable products are?
A. Endothermic
B. Isothermal
C. Exothermic
D. None of these
Right Answer: C. Exothermic
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Enzyme inactivation can be done by?
A. Exposing UV light
B. Exposing X-rays
C. Exposing beta rays
D. All of these
Right Answer: D. All of these
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Which type of reactions are more abundant in organic reaction?
A. Substitution reaction
B. Free Radical reaction
C. Addition reaction
D. Elimination reaction
Right Answer: B. Free Radical reaction
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Which functional group participates in disulphide bond formation in protein?
A. Thio ester
B. Thiol
C. Thioacetone
D. Thioaldehyde
Right Answer: B. Thiol
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Which of the following reacts with aqueous alkaline iodine?
A. 1-Propanol
B. Methanol
C. Ethanol
D. 2-Methyl-2-propanol
Right Answer: C. Ethanol
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18g glucose is dissolved in 90g water. The relative lowering of vapor pressure is equal to?
A. 1/5
B. 1/51
C. 5.1
D. 1/55.5
Right Answer: B. 1/51
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The production of acid amide involves the reaction of ethanoic acid with?
A. Amine
B. Amino acid
C. Ammonia
D. All of these
Right Answer: C. Ammonia
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Which of the following not has equal number of atoms as that in 6g Molybdenum (Ar : 96)
A. 3 g O3
B. 4 g SO2
C. 4 g Ca
D. 5 g SO3
Right Answer: C. 4 g Ca
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The correct order of equivalent conductance at infinite dilution among LiCl, NaCl and KCl is?
A. LiCl > NaCl > KCl
B. NaCl > KCl > LiCl
C. KCl > NaCl > LiCl
D. LiCl > KCl > NaCl
Right Answer: C. KCl > NaCl > LiCl
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Maximum ammonia is used for the?
A. Explosive formation
B. Fertilizer itself
C. Manufacturing of fertilizer
D. Manufacturing of Nylon
Right Answer: C. Manufacturing of fertilizer
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Which of the following is the strongest alkali?
A. NaOH
B. Ca(OH)2
C. CsOH
D. KOH
Right Answer: C. CsOH
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Iron can be prevented from rusting by?
A. Connecting iron to more electropositive metal, a case of cathodic protection
B. Connecting iron to more electropositive metal, a case of anodic protection
C. Connecting iron to less electropositive metal, a case of anodic protection
D. Connecting iron to less electropositive metal, a case of cathodic protection
Right Answer: B. Connecting iron to more electropositive metal, a case of anodic protection
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Which one is very weak acid?
A. HF
B. H2CO3
C. HCl
D. H2O
Right Answer: D. H2O
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Acetic acid (ethanoic acid) can be prepared by ethanol under?
A. Oxidizing condition
B. Reducing condition
C. Redox condition
D. 7.0 pH condition
Right Answer: A. Oxidizing condition
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The process in which the orbitals of different energies and shape mix with each other to give equivalent hybrid orbitals is called?
A. Dissolution
B. Hybridization
C. Resonance
D. Ionization
Right Answer: B. Hybridization
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Which one among the following is not a good leaving group?
A. HSO4
B. OH–
C. Cl–
D. Br–
Right Answer: B. OH–
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The main cause of ozone depletion is?
A. Acid rain
B. Use of CFCs
C. Global Warming
D. None of the above
Right Answer: B. Use of CFCs
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The unit of rate constant of second order reaction is?
A. mol dm-3 sec-1
B. mol-2 dm+6
C. sec-1
D. mol-1 dm+3 sec-1
Right Answer: D. mol-1 dm+3 sec-1
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Dehydrohalogenation of RX occurs in the presence of?
A. An alcoholic base
B. An alcoholic salt
C. An alcoholic acid
D. An alcoholic Grignard reagent
Right Answer: An alcoholic base
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Which compound will readily undergo sulphonation?
A. Benzene
B. Toluene
C. Notro benzene
D. Chlorobenzene
Right Answer: B. Toluene
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In a saturated solution of AgCl, the molar concentration of Ag+ and Cl- is 1.0 x 10-5 M each. What is the value of Ksp?
A. 1.0 x 10-5
B. 0.1 x 10-5
C. 1.0 x 10-15
D. 1.0 x 10-10
Right Answer: D. 1.0 x 10-10
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Which substance is mostly used as coagulant to remove the suspended particles of raw water?
A. Sodium chloride
B. Washing Soda
C. Alum
D. Chile salt Peter
Right Answer: C. Alum
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Which of the following compounds has non directional bond?
A. BF3
B. KBr
C. Mg CO3
D. NF3
Right Answer: B. KBr
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A smuggler was caught by Airport police and 24 g of diamond was recovered from him. How many atoms of carbon he was carrying?
A. 6 x 1023
B. 1.8 x 1024
C. 1.2 x 1024
D. 2.4 x 1024
Right Answer: C. 1.2 x 1024
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Milk of magnesia is?
A. Suspension of Ca(OH)2
B. Suspension of Mg Mg(OH)2
C. Suspension of Mg(OH)2 in water
D. Suspension of Ca(OH)2 and Mg(OH)2
Right Answer: C. Suspension of Mg(OH)2 in water
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Which of the following ketones will produce propanoic acid only after oxidation by acidified potassium dichromate?
A. Ethyl n-propyl ketone
B. Ethyl methyl ketone
C. Dimethyl ketone
D. Diethyl ketone
Right Answer: A. Ethyl n-propyl ketone
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Which of the following is alkyl halide?
A. CH3Cl
B. CH2Cl2
C. C2H4Cl2
D. All of these
Right Answer: A. CH3Cl
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Isotopes are?
A. Chemically similar
B. Physically dissimilar
C. Chemically dissimilar
D. Both a and b
Right Answer: D. Both a and b
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Which of the following test is used to identify amino acids?
A. Silver mirror test
B. Ninhydrin test
C. Iodoform test
D. Allof these
Right Answer: B. Ninhydrin test
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Total number of valance electrons of nitrogen atom in a ammonium ion is?
A. 6
B. 10
C. 8
D. 16
Right Answer: C. 8
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Nitric acid is prepared commercially by?
A. Brikeland and Eyde’s process
B. Contact process
C. Wurtz-Fitting synthesis
D. Haber’s process
Right Answer: A. Brikeland and Eyde’s process
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That solution which possess maximum concentration of solute at given temperature is known as?
A. Unsaturated
B. Saturated
C. Super saturated
D. Dilute solution
Right Answer: B. Saturated
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All II-A group elements react with halogens to form halides of the type?
A. Ionic
B. Polymeric
C. Covalent
D. Amphoteric
Right Answer: A. Ionic
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Which substance does not oxidize easily?
A. CH3CH2CHO
B. CH3CHO
C. HCHO
D. CH3COCH3
Right Answer: D. CH3COCH3
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Which of the following is not a characteristic of SiO2?
A. High transparency to light
B. Very low thermal expansion
C. Solubility in aqua rigia
D. Excellent insulator
Right Answer: C. Solubility in aqua rigia
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Oxidation of SO2(g) in the presence of NO(g) catalyst is an example of?
A. Homogeneous catalysis
B. Auto catalysis
C. Heterogeneous catalysis
D. Negative catalysis
Right Answer: A. Homogeneous catalysis
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Non-stoichiometric compounds of transition elements are called?
A. Hydrates
B. Hydrides
C. Binary compounds
D. Interstital compounds
Right Answer: D. Interstital compounds
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Fats and oils are the example of?
A. Simple lipids
B. Associated lipids
C. Compound lipids
D. Derived lipids
Right Answer: A. Simple lipids
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Which one of the following doesn’t react with water even at red hot temperature?
A. Be
B. Ca
C. Mg
D. Ba
Right Answer: A. Be
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. In laboratory the decomposition of hydrogen peroxide is carried out best by using _____ catalyst.
A. Mn
B. Finally powdered MnO2
C. Chromium
D. All of these
Right Answer: B. Finally powdered MnO2
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During combustion analysis, which one is used for absorbing carbon dioxide?
A. 50% KOH solution
B. Mg (ClO4)2
C. Silica gel and Mg (ClO4)2
D. Silica gel
Right Answer: A. 50% KOH solution
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Arrhenius equation can be used for evaluating?
A. Specific rate constant
B. Both of the above
C. Activation energy
D. Half life period
Right Answer: C. Activation energy
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When alcohols react with Na metal, the alkoxide ion thus formed is a strong?
A. Electrophile
B. Acid
C. Nucleophile
D. None of these
Right Answer: C. Nucleophile
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Reduction of an aldehyde using NaBH4 gives?
A. Primary alcohol
B. Tertiary alcohol
C. Seconadry alcohol
D. Phenol
Right Answer: A. Primary alcohol
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Which of the following will not give iodoform test?
A. Ethanol
B. Ethanal
C. 3-Pentanone
D. 2-Pentanone
Right Answer: C. 3-Pentanone
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Formation of cyanohydrin form an aldehyde is an example of?
A. Nucleophilic substitution
B. Nucleophilic addition
C. Electrophilic addition
D. Electrophilic substitution
Right Answer: B. Nucleophilic addition
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Carbohydrate containing aldehyde is called?
A. Aldose
B. Ketone
C. Fructose
D. Starch
Right Answer: A. Aldose
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Which of the following is not a colligative property?
A. Density
B. Elevation of boiling point
C. Depression in freezing point
D. Osmotic pressure
Right Answer: A. Density
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2-Pentanone and 3-Pentanone are?
A. Metamers
B. Functional group isomers
C. Geometrical isomers
D. Chain isomers
Right Answer: A. Metamers
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In β – Elimination the resulting product is?
A. Alcohol
B. Alkyl halide
C. Alkane
D. Alkene
Right Answer: D. Alkene
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Ozone layer of stratosphere requires protection from indiscriminate use of?
A. Aerosols and high flying jets
B. Pesticides
C. Balloons
D. Atomic explosions
Right Answer: A. Aerosols and high flying jets
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Oxidation of SO2(g) in the presence of V2O5(s) is an example of?
A. Homogeneous catalysis
B. Auto catalysis
C. Heterogeneous catalysis
D. Negative catalysis
Right Answer: C. Heterogeneous catalysis
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Which one of the following is not affect of acid rain?
A. It decrease the pH of natural rain
B. It damages the buildings
C. It leaches metals like aluminium mercury and lead from soil
D. It increase the percentage of CO2 in the atmosphere
Right Answer: D. It increase the percentage of CO2 in the atmosphere
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SN1 reactions are favoured in which solvent?
A. Non polar
B. Slightly polar
C. Polar
D. Solvents
Right Answer: C. Polar
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Reduction of ketone using NaBH4 gives?
A. Primary alcohol
B. Tertiary alcohol
C. Secondary alcohol
D. Phenol
Right Answer: C. Secondary alcohol
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Which one tells amount of the free fatty acid?
A. Sponification number
B. Acid number
C. Iodine number
D. Number of double bonds
Right Answer: B. Acid number
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Carboxylic acid react with ammonia to form which salt?
A. Acid amide
B. Ammonium acetate
C. Acetic anhydride
D. Acetyl chloride
Right Answer: B. Ammonium acetate
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Which pair of electrons of elements will have the same chemical properties?
A. 2, 24
B. 2, 4
C. 13, 22
D. 3, 11
Right Answer: D. 3, 11
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Phenol on treatment with dil. HNO3 at low temperature give?
A. o-Nitrophenol
B. p-Nitrophenol
C. m-Nitrophenol
D. Mixture of o-Nitrophenol and p-Nitrophenol
Right Answer: D. Mixture of o-Nitrophenol and p-Nitrophenol
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Organic acids (Carboxylic acids) are considered as?
A. Strong acids
B. Mild acids
C. Weak acids
D. Mineral acids
Right Answer: C. Weak acids
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The alkyl halide molecule on which the nucleophilic attacks is called?
A. Electrophile
B. Substrate
C. Leaving group
D. Electrophilic centre
Right Answer: B. Substrate
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Tertiary alcohols with acidified dichromate gives?
A. Aldehydes
B. Alkenes
C. Ketones
D. Alkynes
Right Answer: B. Alkenes
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During the formation of an ester from acetic acid, what actually happens?
A. Displacement of the H+ from the acid by Cl
B. Displacement of the OH-1 from the acid by OCH3
C. Attachment of OCH3 with the carbonyl oxygen
D. Displacement of the H+ from the acid by NH2
Right Answer: B. Displacement of the OH-1 from the acid by OCH3
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Dehydration of alcohols with conc. H2SO4 at 180°C gives?
A. Ethers
B. Alkenese
C. Alkyl halides
D. Esters
Right Answer: B. Alkenes
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“Al” metal is extracted from its ________ during electrolysis.
A. Chlorides
B. Cryolite
C. Oxides
D. All of these
Right Answer: C. Oxides
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Which one is mono isotopic element?
A. Cl
B. H
C. F
D. Cd
Right Answer: C. F
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Ethylene is oxidized to acetaldehyde on commercial scale by the use of the catalyst which is?
A. PdCl2 and CuCl2
B. FeO and Mo2O3
C. Na2Cr2O7 and H2SO4
D. All of these
Right Answer: A. PdCl2 and CuCl2
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Electrochemical series is useful in?
A. Prediction of the feasibility of a chemical reaction
B. Calculation of voltage
C. Comparison of the relative tendencies of the metals and non-metals to get oxidized or reduced
D. All of the above
Right Answer: D. All of the above
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Which one of the following doesn’t react quickly with water at room temperature?
A. K
B. Mg
C. Li
D. Na
Right Answer: A. K
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What is the molecular formula of Benzenetriozonide?
A. C6H6O9
B. C6H5O9
C. C6H5O8
D. C6H6O6
Right Answer: A. C6H6O9
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Which one is the most important use of nitric acid?
A. Manufacturing of fertilizers
B. Manufacture of explosives
C. Nylon manufacture
D. All of the above
Right Answer: D. All of the above
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Picric acid can be prepared from phenol by?
A. Halogenation
B. Oxidation
C. Nitration
D. Sulphonation
Right Answer: C. Nitration
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. A peptide having molecular mass less than 10,000 is called?
A. Amino acid
B. Glycoprotein
C. Protein
D. Complex protein
Right Answer: C. Protein
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The solubility of Fe(OH)3 is x molar per dm3. Its Ksp would be?
A. 9x3
B. 27x4
C. 3x4
D. 9x4
Right Answer: B. 27x4
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In which of the following Equilibiria will Kc and Kp have not the same value?
A. 2HI ⇌ H2 + I2
B. 2SO2 + O2 ⇌ 2SO3
C. N2 + O2 ⇌ 2NO
D. All of these
Right Answer: B. 2SO2 + O2 ⇌ 2SO3
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Gram atoms of hydrogen in 5.5g H2?
A. 5.50
B. 2.25
C. 5.45
D. 2.20
Right Answer: A. 5.50
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Thioalcohol is prepared when alkyl halide is reacted with?
A. OH–
B. SH–
C. NO–2
D. I–
Right Answer: C. NO–2
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Excess alcohol at low temperature in presence of conc. H2SO4 produce?
A. Ether
B. Ester
C. Organic acid
D. Alkene
Right Answer: A. Ether
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