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.
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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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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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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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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The following molecules has linear structure except?
A. CS2
B. SO2
C. CO2
D. BeCl2
Right Answer: B. SO2
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Which of the following statement is correct?
A. Zn can replace Cu2+ in CuSO4
B. Cu can replace H+ in H2SO4
C. Cu can replace Zn2+ in ZnSO4
D. None of these
Right Answer: A. Zn can replace Cu2+ in CuSO4
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Which can be replace hydrogen from dilute acids?
A. Au
B. Zn
C. Pt
D. None of these
Right Answer: B. Zn
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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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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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Total number of d-block elements are?
A. 37
B. 35
C. 40
D. All of these
Right Answer: C. 40
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Some O2 is present in water. The water will be considered as “polluted water” when concentration of O2 in it will be?
A. 4 – 8 ppm
B. Less than 4 ppm
C. Greater than 4 ppm
D. Greater than 8 ppm
Right Answer: B. Less than 4 ppm
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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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What will be the pH of 1.0 mol dm-3 of NH4OH, which is 1% dissociated?
A. 2
B. 12
C. 0
D. 2.7
Right Answer: B. 12
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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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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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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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Lack of essential amino acids in diet leads to the disease.
A. Kwashiorkar
B. Sickle cell anaemia
C. Night blindness
D. Pernicious anaemia
Right Answer: A. Kwashiorkar
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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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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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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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Colligative property is not represented by?
A. Elevation of boiling point
B. Osmotic pressure
C. Freezing point
D. Relative lowering of vapor pressure
Right Answer: C. Freezing point
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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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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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The quality of raw water is improved by?
A. Reduction
B. Dehydration
C. Aeration
D. Incineration
Right Answer: C. Aeration
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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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The correct set of four quantum numbers for the valence electron of rubidium (Z = 37) is?
A. n = 5, 1 = 0, m = 0 and s = +1/2
B. n = 5, 1 = 1, m = 1 and s = +1/2
C. n = 5, 1 = 1, m = 0 and s = +1/2
D. n = 6, 1 = 0, m = 0 and s = +1/2
Right Answer: A. n = 5, 1 = 0, m = 0 and s = +1/2
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. In Contact process for the manufacture of sulfuric acid, the most important reaction occurs in the catalyst chamber. Which set of the reactants and the catalyst are correct?
A. Sulfur, air and Pt
B. Sulfur, Oxygen and V2O5
C. Sulfur dioxide, air and V2O5
D. Sulfur dioxide air and steam
Right Answer: C. Sulfur dioxide, air and V2O5
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Which of the following halogen shows metallic luster?
A. Fluorine
B. Chlorine
C. Iodine
D. At
Right Answer: C. Iodine
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Hydrolysis of alkyl nitriles for preparing carboxylic acids requires?
A. Acidic condition
B. Any of the above
C. Alkaline conditions
D. Both are simultaneously necessary
Right Answer: A. Acidic condition
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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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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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For which one of the following pairs of compounds can the members be distinguished by means of Tollen’s tests.
A. HCHO and CH3CHO
B. CH3CHO and CH3COCH3
C. CH3COCH and CH3COCH2CH3
D. CH3COOH and CH3COCH3
Right Answer: B. CH3CHO and CH3COCH3
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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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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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Smog is essentially caused by presence of?
A. O2 and N2
B. O3 and N2
C. O2 and O3
D. Oxides of Sulphur and nitrogen
Right Answer: D. Oxides of Sulphur and nitrogen
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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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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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Which of the following formula is more reactive for hydrolysis?
A. -COOR
B. -COOH
C. -CONH2
D. -COCl
Right Answer: D. -COCl
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The reactivity of oxides of alkaline earth metals _________ down to the group.
A. Increase
B. Decrease
C. Unpredictable
D. Remains constant
Right Answer: A. Increase
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Which of the following is an example of solid in solid solution?
A. Dust particles in smoke
B. Opals
C. Mercury metal in silver metal
D. All of the above
Right Answer: B. Opals
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Major sources of NOx pollutants are?
A. Natural gas
B. Combustion of coal and oil
C. Gasoline
D. All of these
Right Answer: D. All of these
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Which of the following statement is true about galvanic cell?
A. Anode is positively charged
B. Cathode is positively charged
C. Reduction occurs at anode
D. Reduction occurs at cathode
Right Answer: D. Reduction occurs at cathode
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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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Dry ice (Solid CO2) has geometry?
A. Linear
B. Trigonal planer
C. Bent and angular
D. All of the above
Right Answer: A. Linear
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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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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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Which of the following species has lone pair of electrons on central atom?
A. CH4
B. NH+4
C. PCl5
D. PCl3
Right Answer: D. PCl3
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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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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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What type of reaction occurs between ethane and hydrogen?
A. Addition
B. Dehydration
C. Neutraliization
D. Oxidation
Right Answer: A. Addition
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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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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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In esterification reaction, which one of the following bonds of alcohol undergo cleavage?
A. C – H
B. O – H
C. C – O
D. C – C
Right Answer: B. O – H
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What is the pH of ideal buffer?
A. 10
B. 7
C. Less than 7
D. 0
Right Answer: B. 7
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Esters are?
A. Acidic
B. Basic
C. Neutral
D. None of these
Right Answer: C. Neutral
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Which of the following is the example of derived proteins?
A. Proteoses
B. Collagen
C. Enzymes
D. Both a and c
Right Answer: D. Both a and c
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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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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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When the solvent is containing non volatile solute particles, then?
A. Vapor pressure is decreased
B. Vapor pressure doesn’t change
C. Vapor pressure is elevated
D. Volume is decrease
Right Answer: A. Vapor pressure is decreased
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Ethanoic acid can be prepared by hydrolysis of?
A. Methyl chloride
B. Methane nitrile
C. Ethane nitrile
D. Ethyl chloride
Right Answer: B. Methane nitrile
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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 unit of rate constant depends on?
A. Number of reactants
B. Order of Reaction
C. Concentration terms
D. Molecularity of reaction
Right Answer: B. Order of reaction
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Which of the following amino acid is achiral?
A. Histidine
B. Valine
C. Proline
D. None of these
Right Answer: D. None of these
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An element having high ionization energy and tends to be chemically in-active would most likely to be a/an?
A. Alkali metal
B. Noble gas
C. Transition element
D. Halogen
Right Answer: B. Noble gas
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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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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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At equilibrium, the concentration of reactants and products are?
A. Constant
B. Maximum
C. Different
D. Equal
Right Answer: A. Constant
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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 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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The half life period of zero order reaction is equal to?
A. 0.693/K
B. 1/Ka
C. a/2
D. 1.5/Ka2
Right Answer: C. a/2
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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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1 gram molecule refers to
A. Amount in grams equivalent to 1 mole of an atom
B. Amount in grams equivalent to 1 mole of a molecule
C. Amount in grams equivalent to 1 mole of a molecule or a compound
D. Amount in grams of an ionic compound
Right Answer: B. Amount in grams equivalent to 1 mole of a molecule
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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 is a secondary cell?
A. Dry Cell
B. Ni – Cd cell
C. Mercury Cell
D. Alkali Cell
Right Answer: B. Ni – Cd cell
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Haloform test is given by?
A. Acetadehyde
B. Propanone
C. Methyl group ketones
D. All of these
Right Answer: C. Methyl group ketones
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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 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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Number of moles present in 0.6 grams of silica is (Atomic mass Si = 28, O = 16)?
A. 0.01 mole
B. 0.064 mole
C. 0.044 mole
D. 0.054 mole
Right Answer: A. 0.01 mole
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Two enzymes that are distinct chemically and physically but catalyze same reaction are called?
A. Transferees
B. Hydrolases
C. Co-enzymes
D. Iso-enzymes
Right Answer: D. Iso-enzymes
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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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The Friedel craft reaction will be slowest for?
A. Benzene
B. Nitrobenzene
C. Toluene
D. Phenol
Right Answer: B. Nitrobenzene
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Baeyer’s reagent is?
A. 1% alkaline KMnO4
B. (R)3Al and TiCl4
C. 1% acidified potassium dichromate
D. Liquid ammonia
Right Answer: A. 1% alkaline KMnO4
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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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The organic compounds containing both the amino and the carboxyl group are called?
A. Carboxylic acids
B. Mineral acids
C. Amino acids
D. Polybasic acids
Right Answer: C. Amino Acids
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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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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 alcohols is aromatic?
A. Glycerol
B. Ethane-1, 2 diol
C. 2-Phenylethanol
D. None of these
Right Answer: C. 2-Phenylethanol
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Which of the following has maximum steric hindrance?
A. (C2H5)2CO
B. CH3COCH3
C. C3H7COCH3
D. CH3COH
Right Answer: C. C3H7COCH3
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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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Combustion analysis is performed for the determination of?
A. Molar mass of the compound
B. Structural formula of the substance
C. Empirical formula of the compound
D. Mass of halogens present in organic compound
Right Answer: C. Empirical formula of the compound
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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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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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What is the molecular formula of Benzenetriozonide?
A. C6H6O9
B. C6H5O9
C. C6H5O8
D. C6H6O6
Right Answer: A. C6H6O9
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How many electrons have to be removed to ionize 1.0 x 10-6 mol of Ne atoms to Ne+ ions in a neon advertising tube?
A. 6.02 x 1023 / 1.0 x 10-6
B. 1.0 x 10-6 x 6.02 x 1023 / 20.2
C. 1.0 x 10-6 x 6.02 x 1023
D. 1.0 x 10-6 x 6.02 x 1023 / 9.65 x 10-1
Right Answer: C. 1.0 x 10-6 x 6.02 x 1023
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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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The oxidation state of carbon-atom in glucose is?
A. +4
B. +6
C. -4
D. None of these
Right Answer: D. None of these
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Which of the following will decolorize aqueous bromine?
A. 1-pentene
B. 2-methyl-1-butene
C. Pentane
D. Both a and b
Right Answer: D. Both a and b
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Ethanoic acid manufacturing through ethanol involves the use of?
A. Acidified potassium dichromate
B. Both a and c
C. Ammonical silver nitrate
D. Fehling’s solution
Right Answer: A. Acidified potassium dichromate
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Molal boiling point constant is the ratio of the elevation in the boiling to?
A. Molarity
B. Mole fraction of solvent
C. Molality
D. Mole fraction of the solute
Right Answer: C. Molality
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Which one of the following species is not an electrophile?
A. NH3
B. H+
C. Br+
D. BF3
Right Answer: A. NH3
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