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.
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Chemistry Mcqs Online With Answers for NTS PPSC Entry Test Classes
Chemistry
Chemistry Mcqs with Answers solved online.
“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 of the following transition used as a catalyst in Haber’s process?
A. Fe
B. Cr2O3
C. Al2O3
D. All of these
Right Answer: A. Fe
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Which one used in containers and pipe work for reactive and corrosive chemicals?
A. Silicone polymers
B. Teflon
C. Steel
D. None of these
Right Answer: B. Teflon
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Which pair has trigonal planar geometry?
A. NH3, PH3
B. H2O, C2H2
C. BF3, AlH3
D. CO2, SO2
Right Answer: C. BF3, AlH3
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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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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 of the following step is not involved in NH4NO3 manufacturing?
A. Prilling
B. Neutralization of HNO3 with NH3
C. Evaporation
D. Dehydration
Right Answer: D. Dehydration
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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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Number of shared pair of electrons between C and O in a molecule of CO is?
A. 1
B. 3
C. 2
D. 4
Right Answer: B. 3
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Which of the following statements is not correct?
A. Double bond is stronger than the single bond
B. σ bond is stronger than π bond
C. Triple bond is shorter than double bond
D. σ bond is weaker than π bond
Right Answer: D. σ bond is weaker than π bond
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Which of the following will not form enolate ion?
A. CH3COCH3
B. CH3CwHO
C. HCHO
D. All of these
Right Answer: C. HCHO
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Buffer solutions are used in except?
A. Clinical analysis
B. Nutrition
C. Soil science
D. Qualitative analysis
Right Answer: D. Qualitative analysis
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Total heat content of a system is called?
A. Internal energy
B. Enthalpy
C. Entropy
D. All of these
Right Answer: B. Enthalpy
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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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Which of the following has highest ionization energy value?
A. Li
B. Be
C. H
D. He
Right Answer: D. He
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Which one affects the specific rate constant?
A. Temperature
B. Concentration of reactants
C. Catalyst
D. All of these
Right Answer: A. Temperature
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If the energy of the activated complex lies close to energy of reactants, it means that reaction is?
A. Slow
B. Exothermic
C. Endothermic
D. Exothermic and fast
Right Answer: D. Exothermic and fast
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Hydrolysis of CH3CH2CN will synthesize?
A. Ethanoic acid
B. Methanoic acid
C. Propanoic acid
D. Gultamic acid
Right Answer: C. Propanoic acid
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Number of H+ ions when 0.1 mole of sulfuric acid is completely ionized in water?
A. 4×6.022 x 1023
B. 2×6.002 x 1023
C. 1 x 6.022 x 1023
D. None of these
Right Answer: D. None of these
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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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Replacement of hydrogen of benzene by alkyl group in the presence of alkyl halide and aluminum chloride is known as?
A. Dow’s process
B. Friedel and Craft alkylation
C. Friedel and Craft acylation
D. Clemmenson reduction
Right Answer: B. Friedel and Craft alkylation
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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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A compound contains 50% sulphur and 50% oxygen by mass. The empirical formula of the compound is?
A. S2O3
B. SO3
C. SO2
D. SO
Right Answer: C. SO2
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Gold and silver are least reactive due to?
A. Positive oxidation potential
B. Zero oxidation potential
C. Positive reduction potential
D. Having large negative electrode potential
Right Answer: C. Positive reduction potential
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A solution of glucose is 10%. The volume in which 1g mole of it will be dissolved is
A. 1 dm3
B. 200 dm3
C. 1.8 dm3
D. 180 dm3
Right Answer: C. 1.8 dm3
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Which of the following is the example of proteins?
A. Albumin
B. Legumin
C. Globulin
D. All of these
Right Answer: D. All of these
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The stoichiometric calculations for a chemical reaction results in?
A. Actual yield
B. Theoretical yield
C. Percentage yield
D. Selectivity
Right Answer: C. Percentage yield
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He normal amount of overhead ozone is?
A. 300 DU
B. 400 DU
C. 350 DU
D. 450 DU
Right Answer: C. 350 DU
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Molecule in which the distance between two carbon atom is largest is?
A. Ethane
B. Ethene
C. Ethyne
D. Benzene
Right Answer: A. Ethane
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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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The temperature at which nitrogen oxidized to NO during HNO3 production is?
A. 1000°C
B. 1500°C
C. 2000°C
D. 3000°C
Right Answer: D. 3000°C
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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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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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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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Identify the correct order of increasing energy?
A. 1s < 2s < 3s
B. 2s > 3s > 1s
C. 1s > 2s > 3s
D. None of these
Right Answer: A. 1s < 2s < 3s
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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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What sis the colour of Mn+2?
A. Pink
B. Violet
C. Purple
D. Green
Right Answer: A. Pink
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Hydrolysis of amides gives the corresponding?
A. Carboxylic acid
B. Alkane
C. Alcohol
D. Amino acid
Right Answer: A. Carboxylic acid
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Benzene is heated in air with V2O5 at 450°C it undergoes?
A. Substitution reaction
B. Elimination reaction
C. Addition reaction
D. Oxidation reaction
Right Answer: D. Oxidation reaction
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In which process alcohol is produced?
A. Esterification
B. Dehydrohalogenation of vicinal dihalide
C. Fermentation
D. Condensation of two acetone molecules in the presence of base
Right Answer: C. Fermentation
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There are _________ oxides of carbon are known.
A. Two
B. Three
C. Four
D. Five
Right Answer: B. Three
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Which of the following compounds has the highest % age of oxygen by weight?
A. CH3 – OH
B. C2H5 – OH
C. HCCOOH
D. H2O
Right Answer: D. H2O
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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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Which of the following can differ in different acids?
A. R Group
B. Carbonyl oxygen can be replaced in different amino acids
C. Carbonyl group
D. Amino Group
Right Answer: A. R Group
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Which of the following 0.1 m solution will have the lowest freezing point?
A. K2SO4
B.
C.
D.
Right Answer: A. K2SO4
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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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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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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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The ability of transition elements to form complexes is due to?
A. Small size of metal ion
B. Availability of empty d and f orbitals
C. Highly charged metal ion
D. All of these
Right Answer: B. Availability of empty d and f orbitals
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Which statement is correct about DNA?
A. These help in protein synthesis
B. Hydrogen bonding is absent in DNA
C. These help in genetic transmission
D. Ribose sugar is present in DNA
Right Answer: C. These help in genetic transmission
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The manufacturing of nitrogenous fertilizer’s from ammonia is the result of?
A. Addition Reaction
B. Substitution Reaction
C. Acid-base reaction
D. Decomposition reaction
Right Answer: C. Acid-base reaction
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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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The separation of different isotopes in the mass spectrometer is done on the basis of?
A. Different amounts of positive change on each ion
B. Different m/e
C. Different e/m value
D. Velocities of the ions
Right Answer: C. Different e/m value
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Alanine is an amino acid but its nature is?
A. Acidic
B. Neutral
C. Basic
D. All of these
Right Answer: B. Neutral
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What is the Molailty of pure water?
A. 1
B. 55.5
C. 18
D. 6
Right Answer: B. 55.5
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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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The relative lowering of vapor pressure is equal to?
A. Mole fraction of solvent
B. Mole fraction of solution
C. Molar mass of solute
D. Mole fraction of solute
Right Answer: D. Mole fraction of solute
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Neo-pentyl alcohol is a type of alcohol?
A. Primary alcohol
B. Secondary alcohol
C. Tertiary alcohol
D. Aromatic alcohol
Right Answer: A. Primary alcohol
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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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The 2nd order reaction becomes 1st when?
A. One of the reactants is limiting
B. One of the reactants is in large excess
C. None of the reactants is in large excess
D. One of the reactant is acidic
Right Answer: B. One of the reactants is in large excess
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The largest number of moles are present in?
A. 2.8g CO
B. 3.6g H2O
C. 4.8g C2H5OH
D. 5.4g N2O5
Right Answer: B. 3.6g H2O
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Acetyl chloride is soluble in which solvent?
A. H2O
B. Acetone
C. Ether
D. Both b and c
Right Answer: D. Both b and c
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1 gram formula refers to?
A. Amount in grams equivalent to 1 mole of an atom
B. Amount in grams equivalent to 1 mole of a covalent compound
C. Amount in grams equivalent to 1 mole of a ionic compound
D. Amount in grams equivalent to 1 mole of an ion
Right Answer: C. Amount in grams equivalent to 1 mole of a ionic compound
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Which one of the following is alicyclic hydrocarbon?
A. Benzene
B. Isobutylene
C. Cyclohexane
D. Neopentane
Right Answer: C. Cyclohexane
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Which one of the following has the maximum number of sp2 carbon atoms?
A. Benzene
B. Methane
C. CCl4
D. Ethene
Right Answer: A. Benzene
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If an electrophile is the attacking reagent which one is most reactive?
A. R – I
B. R – Br
C. R – Cl
D. R – F
Right Answer: D. R – F
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What will be the pH of 1.0 mol dm-3 of H2X, which is only 50% disscociated?
A. 0
B. 1
C. 2
D. Less than 0
Right Answer: A. 0
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When alkyl halide reacts with sodium metal in the presence of ether. Which product is formed?
A. Alkane with even number carbons
B. Alkane with odd number carbons
C. Alkene
D. Alcohol
Right Answer: A. Alkane with even number carbons
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The acidic character of amino acids is due to?
A. Amino group
B. Carbonyl group
C. Carboxylate
D. Carbonyl oxygen
Right Answer: C. Carboxylate
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Isotopes differ in?
A. Properties with respect to their mass number
B. Properties with respect to their proton number
C. Isotopes don’t differ as they have same number of electrons and protons
D. All of the above
Right Answer: A. Properties with respect to their mass number
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Which one of the following is the same for SiO2 and CO2?
A. Si – O bond distance and C – O bond distance
B. Empirical formula
C. Dipole moments
D. Bond angles
Right Answer: B. Empirical formula
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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 statement is incorrect about lipids
A. Derived from greek word lipos mean fat
B. Derived from fatty acid
C. Soluble in organic solvent
D. Soluble in water
Right Answer: D. Soluble in water
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In the oxidation of unsymmetrical ketone using strong oxidizing agents like conc. HNO3, which carbon atom is preferentially attacked?
A. Carbon atom with the maximum number of hydrogen atoms
B. Carbon atoms with the least number of hydrogen atoms
C. Alpha carbon
D. Beta carbon
Right Answer: A. Carbon atom with the maximum number of hydrogen atoms
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Which of the following can be used for the oxidative preparation of aldehydes from alcohols?
A. Pt – asbestos
B. Na2Cr2O7 and H2SO4
C. FeO and MO2O3
D. All of these
Right Answer: D. All of these
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Which pair of halogens is present in halothanes?
A. F, I
B. F, Cl
C. F, At
D. Cl, I
Right Answer: B. F, Cl
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During the formation of complex compound the Ligands bind with central metal ion/atom by?
A. Covalent bonds
B. Ionic bonds
C. Co-ordinate covalent bond
D. All of these
Right Answer: C. Co-ordinate covalent bond
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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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/Which one among the following is good leaving group?
A. OH–
B. Cl–
C. F–
D. I–
Right Answer: D. I–
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The exothermic process is?
A. Evaporation
B. Respiration
C. Sublimation
D. Boiling
Right Answer: B. Respiration
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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 main advantage of recycling is?
A. Reduced raw material and energy costs
B. Reduced pollution hazards
C. Reduced waste volume
D. All of the above
Right Answer: D. All of the above
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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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Strecker reaction is used for synthesis of?
A. Alcohol
B. Amino acid
C. Aldehyde
D. Ketone
Right Answer: B. Amino acid
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What is the example of zwitter ions?
A. Metamerism
B. Functional group isomerism
C. Tautomerism
D. Positional isomerism
Right Answer: Tautomerism
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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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When an unknown primary alcohol gives yellow precipitates of iodoform, it is most likely to be?
A. Methanol
B. 1-Propanol
C. Ethanol
D. 1-Butanol
Right Answer: C. Ethanol
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Alcohol in which – OH group is attach to carbon which is further attach to only one alkyl group is?
A. Primary alcohol
B. Secondary alcohol
C. Tertiary alcohol
D. None of these
Right Answer: A. Primary alcohol
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Which is example of pentose?
A. Glucose
B. Glyceraldehyde
C. Ribose
D. All of these
Right Answer: C. Ribose
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Which of the following is not primary pollutant?
A. SO3
B. CO
C. NO
D. H2SO4
Right Answer: D. H2SO4
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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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Tetraethyl lead is prepared by reacting ethyl bromide with?
A. Pb
B. Pd
C. Na4Pb
D. NH3
Right Answer: C. Na4Pb
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A nanopeptide contains ________ peptide linkages.
A. 10
B. 8
C. 4
D. 9
Right Answer: B. 8
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Which pair can be used as a reactant for the preparation of acetyl chloride?
A. CH3COOH, HCl
B. CH3COOH, SOCl2
C. CH3, COOH, PCl5
D. Both b and c
Right Answer: D. Both b and c
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A solution of KCl in water contains?
A. Free formula units
B. Free ions
C. Free atoms
D. Free molecules
Right Answer: B. Free ions
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Chloromethane is used in?
A. Production of silicone polymer
B. Petroleum refining
C. Manufacturing of butyle rubber
D. All of these
Right Answer: D. All of these
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The influence of temperature on reaction rate is predicted by?
A. Free energy change of reaction
B. Arrhenius equation
C. Vander waal’ equation
D. Kinetic equation
Right Answer: B. Arrhenius equation
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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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Zinc does not show variable valency, because?
A. Its d-subshell is incomplete
B. It is relatively soft metal
C. Its d-subshell is complete
D. It has two electrons in outermost shell
Right Answer: C. Its d-subshell is complete
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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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