Questions: Top Chemistry MCQS

Question 651: In Bosch Process, that is used to separate the Hydrogen gas from water Gas, the catalyst is used ______?

A FeO
B Both B&C
C Pt
D Cr²O³

Explanation: The correct answer to the question is: Both B&C

Question 652: Consider the following reaction- 2KCIO3 + H2C2O4 + H2SO4 ? K2SO4 + 2H2O + 2CO2 + Oxide Which oxide of chlorine is produced in the above reaction ?

A Cl2O
B Cl2O6
C Cl2O7
D ClO2

Explanation: The correct answer to the question is: ClO2

Question 653: The snow on the mountains does NOT melt all at once when it is heated by the sun because:

A it has a high latent heat of fusion
B it becomes very hard
C it has a low specific heat capacity
D it reflects most of the heat from the sun

Explanation: The correct answer to the question is: it has a high latent heat of fusion

Question 654: The source of the Sun’s energy is the process of ____________?

A Nuclear fission
B Photoelectric emission
C Thermionic emission
D Nuclear fusion

Explanation: The correct answer to the question is: Nuclear fusion

Question 655: The metal which is used in thermite process because of its activity is____________________?

A aluminium
B iron
C zinc
D copper

Explanation: The correct answer to the question is: aluminium

Question 656: LiAlH4 converts Acetaldehyde into ___________?

A Ethyl alcohol
B Acetic acid
C Methane
D Methyl alcohol

Explanation: The correct answer to the question is: Ethyl alcohol

Question 657: The solution remaining after the formation of crystals is called ___________________?

A Residue
B Dilute solution
C both A & B
D Mother liquor

Explanation: The correct answer to the question is: Mother liquor

Question 658: When sulphuric acid is treated with ethanol sulphuric acid behaves like________________?

A as sulphonating agent
B an oxidizing agent
C a dehydrating agent
D an acid

Explanation: The correct answer to the question is: a dehydrating agent

Question 659: Which one is a pure carbon?

A Coal Tar
B None of These
C Coke
D Coal gas

Explanation: The correct answer to the question is: Coke

Question 660: The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is___________?

A Raoult’s law
B Dalton’s law
C Gay Lussac’s law
D Henry’s law

Explanation: The correct answer to the question is: Henry’s law

Question 661: When phenol is heated with concentrated nitric acid the product is________________?

A Picric acid
B o-nitrophenol
C 1 3 5 -trinitro benzene
D p-nitrophenol

Explanation: The correct answer to the question is: Picric acid

Question 662: The systematic name of sucrose is_______?

A 1-β- D- glucofuranosyl-2-α- D- fructofuranoside
B 1-α-D- glucofuranosyl-2-α-D- fructopyranoside
C 11-α-D-glucopyranosyl-2-β-D-fructofuranoside
D 1-α-D- glucopyranosyl-2-β-D-fructopyranoside

Explanation: The correct answer to the question is: 1-α-D- glucopyranosyl-2-β-D-fructopyranoside

Question 663: Iodoform test can be used to distinguish between_________________?

A ethanol and methanol
B acetaldehyde and methanal
C acetone and diethyl ketone
D all of the above

Explanation: The correct answer to the question is: all of the above

Question 664: What are the metal bearing rocks called?

A Ores
B Metalloids
C Bitumen
D Bauxite

Explanation: The correct answer to the question is: Ores

Question 665: Find the PH of a 0.001 M solution of Nitric acid HNO3?

A 2
B 3
C 4
D 5

Explanation: The correct answer to the question is: 3

Question 666: Which one does not give borax bead test_________________?

A Barium sulphate
B Copper sulphate
C Nickel sulphate
D Cobalt sulphate

Explanation: The correct answer to the question is: Barium sulphate

Question 667: Removal of halogen and hydrogen atom is_________________?

A hydrohalogenation
B halogenation
C dehydrohalogenation
D dehalogenation

Explanation: The correct answer to the question is: dehydrohalogenation

Question 668: Cathode is a metalic plate where__________ takes place.

A Redox
B Reduction
C Oxidation
D Substitution

Explanation: The correct answer to the question is: Reduction

Question 669: In an electrolysis of aqueous Sodium Flouride, the species that moves towards Anode is _________?

A Flouride
B H²O
C None of them
D Sodium

Explanation: The correct answer to the question is: H²O

Question 670: Borax is a white crystalline solid and it is_________________?

A More soluble in hot water
B More soluble in cold water
C Insoluble in water
D Soluble only in organic solvents

Explanation: The correct answer to the question is: More soluble in hot water

Question 671: Which allotropic form of phosphorous is the most stable ?

A White
B black
C Violet
D red

Explanation: The correct answer to the question is: black

Question 672: Preparation of vegetable ghee involves_________________?

A hydroxylation
B halogenation
C hydration
D hydrogenation

Explanation: The correct answer to the question is: hydrogenation

Question 673: which Compound Destroy The OZONE ?

A BOTH A & B
B CFCs
C None Of These
D CH3COOH

Explanation: The correct answer to the question is: CFCs

Question 674: The medium which interact with long lived pollutant is:_____________?

A Receptor
B All of them
C Sink
D Source

Explanation: The correct answer to the question is: Sink

Question 675: Acetaldehyde cannot show

A Lucas test
B Iodoform test
C Benedict’s test
D Tollen’s test

Explanation: The correct answer to the question is: Lucas test

Question 676: Which of the following is the use of Silver nitrate?

A All of these
B used in making green pigments
C used in photography and medicines
D used as mordant in dyeing

Explanation: The correct answer to the question is: used in photography and medicines

Question 677: Which one of the following pairs shown diagonal relationship in the periodic table ?

A Lithium and magnesium
B Lithium and beryllium
C Boron and Beryllium
D Sodium and Lithium

Explanation: The correct answer to the question is: Lithium and magnesium

Question 678: When an aldehyde is reacted with hydrogen cyanide a ” Cyanihydrin” is formed. This process is best termed as __________?

A Electrophilic addition
B Electrophilic substitution
C Nucleophilic addition
D Necleophilic substitution

Explanation: The correct answer to the question is: Nucleophilic addition

Question 679: Cannizaros reaction takes place through the transfer of ____________________ from complex anion?

A hydride ion
B hydrogen ion
C oxide ion
D methoxide ion

Explanation: The correct answer to the question is: hydride ion

Question 680: Photographic plates are coated with a thin film of _________________?

A AgNO3
B AgI
C AgCl
D AgBr

Explanation: The correct answer to the question is: AgBr

Question 681: One Water molecule can form maximum ______hydrogen bonds.

A 3
B None
C 2
D 4

Explanation: The correct answer to the question is: 4

Question 682: Boyle’s Law was given by the Robert Boyle in_______?

A 1661
B 1662
C 1660
D 1663

Explanation: The correct answer to the question is: 1662

Question 683: The process of fermentation of starch involve many enzymes the sequence of enzymes used are____________________?

A Diastase-zymase-maltase
B Diastase-maltase-zymase
C Maltase-diastase-zymase
D Zymase-maltase-diastase

Explanation: The correct answer to the question is: Diastase-maltase-zymase

Question 684: The chemical composition of cinnabar is__________________?

A ZnS
B PbS
C HgS
D FeS

Explanation: The correct answer to the question is: HgS

Question 685: Identify the unsaturated compound that does not give red ppts when treated with____________Ammonical cuprous chloride

A CH-CCH(1-Propyne)
B CH-CH-CHCCH(1-Pentyne)
C CH-CH-CCH (1-Butyne)
D CH=CH

Explanation: The correct answer to the question is: CH=CH

Question 686: Raney nickel is prepared from ______________________ by treating with caustic soda?

A Ni-Cu alloy
B Ni-Mg alloy
C Ni-Al alloy
D Ni-Fe alloy

Explanation: The correct answer to the question is: Ni-Al alloy

Question 687: The practical problem in Hydrogen production is it:______________?

A Size
B Weight
C Valency
D Chemical property

Explanation: The correct answer to the question is: Weight

Question 688: Which of the following shows electrical conduction_____?

A Graphite
B Potassium
C Diamond
D Sodium

Explanation: The correct answer to the question is: Graphite

Question 689: Chlorination of toluene in the presence of sublight produces_________________?

A p – chlorotoluene
B benzoic acid
C Benzyl chloride
D o – chlorotoluene

Explanation: The correct answer to the question is: Benzyl chloride

Question 690: Octane number is 0 value for ___________?

A iso-heptane
B n-hexane
C iso-octane
D n-heptane

Explanation: The correct answer to the question is: n-heptane

Question 691: Which one of the following substances conducts electricity by the movement of ions ?

A Graphite
B Molten sodium chloride
C Copper
D Mercury

Explanation: The correct answer to the question is: Molten sodium chloride

Question 692: The fundamental way to transfer energy are:_____________?

A heat and volume
B pressure and temperature
C heat and work
D pressure and volume

Explanation: The correct answer to the question is: heat and work

Question 693: The main buffer system of the human blood is____________?

A HCO – HCO
B CHCOOH – CHCOO
C HCO – CO
D NHCONH – NHCONH

Explanation: The correct answer to the question is: HCO – HCO

Question 694: The acetylene molecule contains:___________?

A 3 sigma and 2 pi bonds
B 2 sigma and 3 pi bonds
C 5 sigma bonds
D 4 sigma and 1 pi bonds

Explanation: The correct answer to the question is: 3 sigma and 2 pi bonds

Question 695: Black foot disease is caused by the pollution of groundwater as a consequence of increased seepage of:__________?

A Fluorides
B Mercury
C Arsenic
D Nitrates

Explanation: The correct answer to the question is: Arsenic

Question 696: Which of the following gases when passed through warm dilute solution of H2SO4 in presence of HgSO4 gives acetaldehyde

A CH
B CH
C CH
D CH

Explanation: The correct answer to the question is: CH

Question 697: Sabatier Senderns reaction involve _____________ in presence of Ni?

A alkene & O2
B alkene & N2
C alkyne & Cl2
D Aalkene & H2

Explanation: The correct answer to the question is: Aalkene & H2

Question 698: In network of silica (SiO2) each silicon atom is surrounded by _____________ atoms of osygen?

A 1
B 6
C 2
D 4