Top Chemistry MCQS
All Questions for: Top Chemistry MCQS
Question 101: An organic compound has a triple bond and not double bond. It can be tested by __________?
- A Ammonical silver nitrate
- B Bromine water
- C Bayer’s reagent
- D Fehling solution
Explanation: The correct answer to the question is: Ammonical silver nitrate
Question 102: The system which exchange only energy with its surroundings is called______________?
- A Isolated system
- B closed system
- C Open system
- D All of the above
Explanation: The correct answer to the question is: closed system
Question 103: In a closed vessel, a gas is heated from 300K to 600 K. The kinetic energy becomes__________?
- A Half
- B Same
- C Four times
- D Double
Explanation: The correct answer to the question is: Double
Question 104: Cyclone collector is used for minimizing:____________-?
- A Soil pollution
- B Sound pollution
- C Air pollution
- D Water pollution
Explanation: The correct answer to the question is: Air pollution
Question 105: Which of the following noble gases is not present in atmosphere?
- A Radon
- B Helium
- C Argon
- D Xenon
Explanation: The correct answer to the question is: Radon
Question 106: Which of the following is not use of compounds of Fluorine________________?
- A Sodium fluoroacetate is a rat poison
- B None of the above
- C SbF3 is used for manufacture of pottery
- D Cu F2 is used in ceramic industry
Explanation: The correct answer to the question is: None of the above
Question 107: Because of its ability to combine with both oxygen and nitrogen aluminium metal is used_____________?
- A As insulator
- B To remove air bubbles from molten metal
- C To produce alloy
- D As nitrometer
Explanation: The correct answer to the question is: To remove air bubbles from molten metal
Question 108: Gypsum is applied to the soil as a source of________________?
- A Ca and S
- B S and P
- C Ca and P
- D we could not apply
Explanation: The correct answer to the question is: Ca and S
Question 109: Which of the following is more acidic in nature?
- A Aniline
- B Benzene
- C Cresol
- D Phenol
Explanation: The correct answer to the question is: Phenol
Question 110: The number of lone pairs in XeOF4 is_________?
- A O
- B 3
- C 1
- D 2
Explanation: The correct answer to the question is: 1
Question 111: Ozone is formed in the upper layer of the atmosphere from oxygen by action of:____________?
- A Free radicals
- B Nitrogen oxides
- C UV -rays
- D Cosmic rays
Explanation: The correct answer to the question is: UV -rays
Question 112: A compound is determined to have an emperical formula of C2H6O and a molar mass of 138 g/mole. What is the molecular formula?
- A C6H18O3
- B C2H6O
- C C6H12O6
- D C2H5O
Explanation: The correct answer to the question is: C6H18O3
Question 113: Biodegradable pollutant is:_____________?
- A Aluminum foil
- B mercury salt
- C DDT
- D Domestic waste
Explanation: The correct answer to the question is: Domestic waste
Question 114: Azimuthal quantum number defines___________?
- A Magnetic momentum of an electron
- B Spin of an electron
- C Angular momentum of an electron
- D e/m ratio of an electron
Explanation: The correct answer to the question is: Angular momentum of an electron
Question 115: The product On the oxidation of 2°Alcohol is ________?
- A Carboxylic acid
- B Ester
- C Ketone
- D Aldehyde
Explanation: The correct answer to the question is: Ketone
Question 116: Reading of a Barometer going down is an indication of:___________?
- A Intense heat
- B Storm
- C Rainfall
- D Snow
Explanation: The correct answer to the question is: Rainfall
Question 117: Gypsum is______?
- A CaSO4
- B CaSO4.1/2H2O
- C CaSO4,2H2O
- D CaSO4.3H2O
Explanation: The correct answer to the question is: CaSO4,2H2O
Question 118: BeCl2 has the hybrid orbitaks of type_______?
- A Sp3
- B Sp
- C dsp2
- D Sp2
Explanation: The correct answer to the question is: Sp
Question 119: Those aliphatic hydrocarbons which contain carbon to carbon single covalent bond in the chain are called ___________?
- A Alkenes
- B Alkanes
- C Alkynes
- D a & c
Explanation: The correct answer to the question is: Alkanes
Question 120: Cassiterite is an ore of_______?
- A Sn
- B Sb
- C Mn
- D Ni
Explanation: The correct answer to the question is: Sn
Question 121: Identify the Molecular mass for Glucose (C6H12O6) among the following.
- A 180amu
- B 98amu
- C 188amu
- D 190amu
Explanation: The correct answer to the question is: 180amu
Question 122: Mass spectroscopy mainly tells about ____________?
- A Isotopes
- B e/m ratio
- C Mass
- D None of These
Explanation: The correct answer to the question is: e/m ratio
Question 123: Absolute alcohol is obtained when rectified spirit is treated with__________________?
- A Ca(OH)2
- B CaCO3
- C CaCl2
- D CaO
Explanation: The correct answer to the question is: CaO
Question 124: The process of aluminium extraction is called__________________?
- A Haber process
- B Hall process
- C Thermite process
- D Contact process
Explanation: The correct answer to the question is: Hall process
Question 125: Ozonolysis of benzene produces___________________?
- A Vicinal diol
- B Glyoxal
- C Glycol
- D Both B & C
Explanation: The correct answer to the question is: Glyoxal
Question 126: Atom is the smallest particall which is_________?
- A Non of these
- B Divisible
- C Indivisible
- D Both
Explanation: The correct answer to the question is: Indivisible
Question 127: Kipps Apparatus is used to prepare_________?
- A Cu
- B NaOH
- C Cl²
- D H²S
Explanation: The correct answer to the question is: H²S
Question 128: Which of the following haloalkane is hydrolysed by SN1 mechanism?
- A CH3CH2CH2Br
- B CH3CH2Br
- C CH3Br
- D (CH3)3CBr
Explanation: The correct answer to the question is: (CH3)3CBr
Question 129: Effective volume is usually taken for ____________ ?
- A 5 moles of gas
- B 1 mole of gas
- C 2 moles of gas
- D 3moles of gas
Explanation: The correct answer to the question is: 1 mole of gas
Question 130: Aqueous solution of borax above 62°C gives crystals of________________?
- A Na2B4O7.10H2O
- B Na2B4O7.2H2O
- C Na2B4O7.4H2O
- D Na2B4O7.5H2O
Explanation: The correct answer to the question is: Na2B4O7.5H2O
Question 131: What is the density ofargon gas at a temperature of 30°C and a pressure of 1.05 atm?
- A 1.68 g/L
- B 1.67 g/L
- C 1.65 g/L
- D None of the above
Explanation: The correct answer to the question is: 1.68 g/L
Question 132: Which of the following element has the maximum electron affinity_____?
- A F
- B Br
- C I
- D Cl
Explanation: The correct answer to the question is: Cl
Question 133: Formalin consists of mixture of formaldehyde methyl alcohol and water Percentage of water in it is________________?
- A 52%
- B 60%
- C 50%
- D 8%
Explanation: The correct answer to the question is: 52%
Question 134: During Electrolysis of Water the product @cathode obtained is ___________?
- A CO & Water
- B Oxygen Gas & Water
- C Hydrogen Gas & Water
- D Hydrogen & Carbon monoxide
Explanation: The correct answer to the question is: Hydrogen Gas & Water
Question 135: The method in which more steam is passed through the water Gas to oxidize CO to Carbon Dioxide which is then more soluble in water than Hydrogen gas and gets separated is called______.
- A Thermal decomposition
- B Bosch Process
- C liquification process
- D Fragmentation
Explanation: The correct answer to the question is: Bosch Process
Question 136: Chemistry is given from ……language ?
- A Arabic
- B None of these
- C Greek
- D Latin
Explanation: The correct answer to the question is: Greek
Question 137: In acidic medium, ____ is used to balance oxygen atoms in an ionic equation.
- A H+
- B H2O
- C OH-
- D O
Explanation: The correct answer to the question is: H2O
Question 138: When limestone reacts with water, which gas is released?
- A Nitrogen
- B Hydrogen
- C Carbon Dioxide
- D Oxygen
Explanation: The correct answer to the question is: Carbon Dioxide
Question 139: Which one of the following results in the discovery of proton.
- A X-rays
- B Alpha rays
- C Canal rays
- D Cathode rays
Explanation: The correct answer to the question is: Canal rays
Question 140: Downs cell is used to prepare_________________?
- A Sodium metal
- B Sodium hydroxide
- C Sodium bicarbonate
- D Sodium carbonate
Explanation: The correct answer to the question is: Sodium metal
Question 141: Aniline is a derivative of benzene which contains__________________?
- A Nitro group
- B Amide group
- C Amino group
- D Imino group
Explanation: The correct answer to the question is: Amino group
Question 142: Which of the elements show passivity when treated with conc. HNO3?
- A All of the above
- B A
- C Fe
- D Cr
Explanation: The correct answer to the question is: All of the above
Question 143: Special features of borate glass is that it is_________________?
- A Low melting
- B Heat resistant
- C Green in colour
- D Used to prepare chemical garden
Explanation: The correct answer to the question is: Heat resistant
Question 144: The carbon atom of carbonyl group is__________________?
- A sp2 hybridized
- B dsp2 hybridized
- C cp3 hybridized
- D sp hybridized
Explanation: The correct answer to the question is: sp2 hybridized
Question 145: Which alcohol will undergo elimination reaction to give alkene in the presence of acidic potassium dichromate ?
- A Tertiary alcohol
- B Primary alcohol
- C Secondary alcohol
- D All of above
Explanation: The correct answer to the question is: Tertiary alcohol
Question 146: Example of linear polymer is ______________?
- A High density polythene
- B both A and C
- C Low density polythene
- D PVC
Explanation: The correct answer to the question is: both A and C
Question 147: Dehalogenation of ethyl tetrahalide will give____________________?
- A all of the above are possible
- B ethene
- C ethyne
- D ethyl halide
Explanation: The correct answer to the question is: ethyne
Question 148: The maximum amount of product obtained by balanced chemical equation is called as __________?
- A Actual yield
- B NOT
- C Practical yield
- D Theoretical yield
Explanation: The correct answer to the question is: Theoretical yield
Question 149: K2Cr2O7/H2SO4 generate____________________?
- A Nascent oxygen[O]
- B Oxygen
- C Nascent hydrogen[H]
- D Hydrogen
Explanation: The correct answer to the question is: Nascent oxygen[O]
Question 150: The science of fermentation is called _______ ?
- A Zymurgy
- B Zymology
- C Zygology
- D Zootaxy
Explanation: The correct answer to the question is: Zymology