Top Chemistry MCQS
All Questions for: Top Chemistry MCQS
Question 151: Which one of the following reactants will be required to form straight chain alcohol by using Grignard reagent________________?
- A both A & C
- B formaldehyde
- C ethylene epoxide
- D ketone
Explanation: The correct answer to the question is: both A & C
Question 152: What is the mass of one mole of Iodine?
- A 74g
- B 127g
- C 254g
- D 53g
Explanation: The correct answer to the question is: 254g
Question 153: The formula C6H5-CO-CH3 represents_______ ?
- A Phenyl acetate
- B Acetone
- C Acetic acid
- D Acetophenone
Explanation: The correct answer to the question is: Acetophenone
Question 154: Which of the following is used with milk of lime to kill fungus and molds?
- A Chlorine
- B Nitric acid
- C Silver nitrate
- D Copper Sulfate
Explanation: The correct answer to the question is: Copper Sulfate
Question 155: The stationary and mobile phases in paper chromatography are____________?
- A Solid/liquid
- B Liquid/liquid
- C Liquid/gas
- D Liquid/solid
Explanation: The correct answer to the question is: Solid/liquid
Question 156: R-Mg-Br is called___________________?
- A Metallic alkyl halide
- B Grignard reagent
- C Alkyl
- D Both A & B
Explanation: The correct answer to the question is: Both A & B
Question 157: Benzene does not undergo___________________?
- A Polymerization reactions
- B Substitution reaction
- C Addition reaction
- D Oxidation reactions
Explanation: The correct answer to the question is: Polymerization reactions
Question 158: When alcohol reacts with phosphorous halides it geive____________________?
- A alkynes
- B alkyl amine
- C alkanes
- D alkyl halides
Explanation: The correct answer to the question is: alkyl halides
Question 159: The bond length of C=C is___________?
- A 1.54A°
- B 1.68A°
- C 1.20A°
- D 1.34A°
Explanation: The correct answer to the question is: 1.68A°
Question 160: Universe is almost 70% made up of __________?
- A Chlorine
- B Carbon
- C Hydrogen
- D Helium
Explanation: The correct answer to the question is: Hydrogen
Question 161: Which of the following is unit of Viscosity?
- A Torr
- B Decibell
- C Hertz
- D Poise
Explanation: The correct answer to the question is: Poise
Question 162: Fehling solution react with HCHO to form precipitate of _____________?
- A Blue colour
- B White colour
- C Red colour
- D Yellow colour
Explanation: The correct answer to the question is: Red colour
Question 163: Nitronium ion is___________________?
- A NO2-
- B NO
- C NO3
- D NO2+
Explanation: The correct answer to the question is: NO2+
Question 164: Silver mirror is a test for ____________?
- A Ethers
- B Thio alcohols
- C Aldehydes
- D Amines
Explanation: The correct answer to the question is: Aldehydes
Question 165: What is the formula of Copper Sulfate?
- A CuSO4.4H2O
- B CuSO3.4H2O
- C CuSO4.5H2O
- D CuSO3.5H2O
Explanation: The correct answer to the question is: CuSO4.5H2O
Question 166: Vander Waals forces are stronger in_______________?
- A F2
- B Cl2
- C Br2
- D I2
Explanation: The correct answer to the question is: I2
Question 167: Element that have same number of neutrons are called__________?
- A None of these
- B isotope
- C isotone
- D isobar
Explanation: The correct answer to the question is: isotone
Question 168: Which one of the following compound does not have – OH group___________________?
- A ethylene glycol
- B picric acid
- C glycerol
- D ethyl acetate
Explanation: The correct answer to the question is: ethyl acetate
Question 169: The halogen having highest electron affinity is_____________________?
- A Iodine
- B Chlorine
- C Fluorine
- D Bromine
Explanation: The correct answer to the question is: Chlorine
Question 170: The best method of preparation of alkyl halides is a reaction of alcohol with__________________?
- A PCI3
- B PCI5
- C Zn / HCI
- D SOCl2 / Pyridine
Explanation: The correct answer to the question is: SOCl2 / Pyridine
Question 171: The deliquescence is a property in which a solid____________________?
- A Loses water of crystallization
- B Absorbs moisture and remains solid
- C Absorbs moisture and turns to liquid form
- D Increases the number of water of crystallization
Explanation: The correct answer to the question is: Absorbs moisture and turns to liquid form
Question 172: The general formula for alkenes is:______________?
- A CnH2n
- B CnH2n+1
- C CnH2n-2
- D CnH2n+2
Explanation: The correct answer to the question is: CnH2n
Question 173: Oxalate ion behaves as a ________ ligand.
- A Unidentate
- B Tridentate
- C Hexadentate
- D Bidentate
Explanation: The correct answer to the question is: Bidentate
Question 174: Clemmensens reduction infolves the reduction of___________________?
- A ketone
- B alkane
- C aldehyde
- D all of the above
Explanation: The correct answer to the question is: ketone
Question 175: Which of the following does not contain phosphorus ?
- A Nerves
- B Bone
- C Yolk of egg
- D Steel
Explanation: The correct answer to the question is: Steel
Question 176: In a molecule of carbon monoxide, what are the formal charges on the two atoms?
- A Carbon= +1, Oxygen= -1
- B Carbon= -1, Oxygen= +1
- C Carbon=0, Oxygen= -1
- D Carbon=0, Oxygen=0
Explanation: The correct answer to the question is: Carbon= -1, Oxygen= +1
Question 177: For the generation of biogas, the materials commonly used are__________?
- A Aquatic plants
- B None of these
- C Animal wastes
- D Forest residues
Explanation: The correct answer to the question is: Animal wastes
Question 178: Electrolysis of dilute solution of NaCl results at the anode_______________?
- A hydrogen
- B sodium
- C chlorine
- D oxygen
Explanation: The correct answer to the question is: oxygen
Question 179: The Boiling Point of Ethyl Alcohol is_________?
- A 58°C
- B 73°C
- C 78°C
- D 56°C
Explanation: The correct answer to the question is: 78°C
Question 180: Nitrates of which pair of elements give different products on thermal decomposition ?
- A Li Na
- B Mg Ca
- C Na K
- D Li Ca
Explanation: The correct answer to the question is: Li Na
Question 181: Example of copolymers is _____________?
- A Polyethylene
- B PVC
- C nylon 6-6
- D Orlon
Explanation: The correct answer to the question is: nylon 6-6
Question 182: Traffic policemen on duty at busy street crossings during heavy traffic rush hours are advised to use:__________?
- A Hydrogen tank
- B Oxygen tank
- C Nitrogen tank
- D None of these
Explanation: The correct answer to the question is: Oxygen tank
Question 183: When CO2 is made to react with ethyl magnesium iodide followed by acid hydrolysis the product formed is _________________?
- A propane
- B propanol
- C propanoic acid
- D propanal
Explanation: The correct answer to the question is: propanoic acid
Question 184: Methanol can be obtained from_________________?
- A methane
- B destructive distillation of wood
- C all
- D water gas
Explanation: The correct answer to the question is: all
Question 185: An acid-Base Reaction is always a/an __________?
- A Exothermic
- B Fusion
- C Fission
- D Endothermic
Explanation: The correct answer to the question is: Exothermic
Question 186: Which law states that the volume of a given amount of gas held at constant pressure is directly proportional to the Kelvin temperature?
- A Graham’s Law
- B Charles’ Law
- C Boyle’s law
- D Avogadro’s Law
Explanation: The correct answer to the question is: Charles’ Law
Question 187: Arsenic oxides are removed by passing through_________________?
- A Aluminium hydroxide
- B Sodium hydroxide
- C Calcium hydroxide
- D Ferric hydroxide
Explanation: The correct answer to the question is: Ferric hydroxide
Question 188: Ethylene epoxide treated with Grignards reagent followed by acid hydrolysis yield __________________?
- A secondary alcohol
- B dihydric alcohol
- C tertiary alcohol
- D primary alcohol
Explanation: The correct answer to the question is: primary alcohol
Question 189: Which compound is also known by the name of carbolic acid ?
- A H2CO3
- B C2H2OH
- C C6H5OH
- D H3PO3
Explanation: The correct answer to the question is: C6H5OH
Question 190: The blotting paper helps observe liquid by__________?
- A Capillary Action
- B Viscosity
- C Boldness
- D Surface Action
Explanation: The correct answer to the question is: Capillary Action
Question 191: Which group contains elements that exist as monoatomic molecule?
- A 14
- B 1
- C 2
- D 18
Explanation: The correct answer to the question is: 18
Question 192: The ether used in Wurtz synthesis is__________________?
- A basic
- B acidic
- C aqueous
- D dry
Explanation: The correct answer to the question is: dry
Question 193: Bosch Process involves _______?
- A Crackling
- B Reduction
- C Isomerization
- D Oxidation
Explanation: The correct answer to the question is: Oxidation
Question 194: Value of normal atmospheric pressure at sea level at 0°C is______?
- A 1 atm
- B 76cm of Hg
- C All of these
- D 760 Torr
Explanation: The correct answer to the question is: All of these
Question 195: d-block elements are also called as __________?
- A Inner Transition
- B Both B & C
- C Outer Transition
- D Alkali Metals
Explanation: The correct answer to the question is: Outer Transition
Question 196: The carbon-carbon bond strength is maximum in__________?
- A Benzene
- B Cyclohexane
- C CH2=CH2
- D CH3CH3
Explanation: The correct answer to the question is: CH3CH3
Question 197: The criteria for aromaticity is presence of_________?
- A Cyclic structure
- B Unsaturations
- C Presence of 4nπ electrons
- D Presence of 4n+2π electrons
Explanation: The correct answer to the question is: Presence of 4n+2π electrons
Question 198: Which set of quantum numbers is not allowed?
- A n=2,l=0,m1=0,ms=-1/2
- B n=2,l=2,m1=1,ms=-1/2
- C n=2,l=1,m1=0,ms=+1/2
- D n=2,l=1,m1=-1,ms=+1/2
Explanation: The correct answer to the question is: n=2,l=2,m1=1,ms=-1/2
Question 199: Which of the following orbitals has maximum penetration effect?
- A d
- B f
- C P
- D S
Explanation: The correct answer to the question is: S
Question 200: Which one of the following species is not an electrophile ?
- A Br+
- B NH3
- C BF3
- D H+
Explanation: The correct answer to the question is: NH3