Top Chemistry MCQS
All Questions for: Top Chemistry MCQS
Question 551: On oxidation, an alcohol gives an aldehyde having same number of carbon atoms as in alcohol, the alcohol is____
- A None of These
- B Tertiary alcohol
- C Primary Alcohol
- D Secondary Alcohol
Explanation: The correct answer to the question is: Primary Alcohol
Question 552: Incomplete oxidation of methane in the limited supply of air forms ?
- A CO2 and H2O
- B CH3OH
- C CO + H2O + C
- D CO + H2 + C
Explanation: The correct answer to the question is: CH3OH
Question 553: The only non metal exists in liquid state is ___________?
- A Phosphorus
- B Bromine
- C Mercury
- D Iodine
Explanation: The correct answer to the question is: Bromine
Question 554: A brivalent metal has the equivalent weighr of 12. The molecular weight to its oxide will be_______?
- A 32
- B 24
- C 36
- D 40
Explanation: The correct answer to the question is: 40
Question 555: An acid with unpleasant smell_________________?
- A acetic acid
- B formic acid
- C butyric acid
- D propionic acid
Explanation: The correct answer to the question is: butyric acid
Question 556: The system which can exchange matter as well as energy with its surroundings is called____________?
- A open system
- B Inert system
- C Isolated system
- D Closed system
Explanation: The correct answer to the question is: open system
Question 557: Formalin is ___________ solution of formaldehyde in water?
- A 20%
- B 40%
- C 60%
- D 10%
Explanation: The correct answer to the question is: 40%
Question 558: The element cesium bears resemblance with________________?
- A Cr
- B Both of the above
- C None of the above
- D Ca
Explanation: The correct answer to the question is: None of the above
Question 559: Li is different from its family members due to____________________?
- A all of the above
- B high charge density
- C small size
- D less electropositivity
Explanation: The correct answer to the question is: all of the above
Question 560: Carbonates of lithium are not stable like that of sodium due to________________?
- A Not known yet
- B Low electronegativity
- C Low electropositivity
- D Low charge density
Explanation: The correct answer to the question is: Low electropositivity
Question 561: Alkyl halides undergo a type of reaction_________________?
- A both A & C
- B Elimination
- C Nucleophilic addition
- D Nucleophilic substitution
Explanation: The correct answer to the question is: both A & C
Question 562: If temperature of gallium arsenide is increased then its conductivity will___________________?
- A decrease
- B increase
- C remains constant
- D first decreases then increases
Explanation: The correct answer to the question is: increase
Question 563: Order of ease of halogenation in alkane is________________?
- A F2>Cl2>Br2>I2
- B F2>Cl2>I2>Br2
- C Cl2>F2>Br2>I2
- D I2>Cl2>Br2>F2
Explanation: The correct answer to the question is: F2>Cl2>Br2>I2
Question 564: Alcohols of lower Molecular weight are _______________?
- A Soluble in water on heating
- B Insoluble in water
- C Insoluble in all solvents
- D More Soluble in water
Explanation: The correct answer to the question is: More Soluble in water
Question 565: General formula of alkyne is______________?
- A CnH2n
- B CnH2n + 2
- C CnH2n + 2
- D CnH2n – 2
Explanation: The correct answer to the question is: CnH2n – 2
Question 566: Which of the following is non spontaneous cell?
- A Not
- B Galvanic cell
- C Daniel cell
- D Electrolytic cell
Explanation: The correct answer to the question is: Electrolytic cell
Question 567: The bond angle between hybrid orbitals in methane CH3 is___________?
- A 105. 7°
- B 180°
- C 109.5°
- D 115.5°
Explanation: The correct answer to the question is: 109.5°
Question 568: Phosphorus is a Greek word and it means_________________?
- A Tetrahedral
- B Impure
- C Fire
- D Light bearing
Explanation: The correct answer to the question is: Light bearing
Question 569: Alkaline PH scale starts from?
- A 0 to 14
- B 6 to 10
- C 7 to 11
- D 8 to 14
Explanation: The correct answer to the question is: 8 to 14
Question 570: The word Alkali means__________________?
- A Base
- B Basic salt
- C Ashes
- D Spirit
Explanation: The correct answer to the question is: Ashes
Question 571: At what digit of PH scale PH is neutral?
- A 7
- B 10
- C 3
- D 5
Explanation: The correct answer to the question is: 7
Question 572: Silver nitrate is also known as____________?
- A Lunar Caustic
- B Both A & B
- C Blue Vitriol
- D Blue Stone
Explanation: The correct answer to the question is: Lunar Caustic
Question 573: Optic fibres are used in :
- A X-ray photos
- B Ultrasound scans
- C CAT scans
- D Endoscopy
Explanation: The correct answer to the question is: Endoscopy
Question 574: Which of the following is not a use of acetaldehyde ?
- A formation of phenolic resins
- B antiseptic inhalant
- C formation of mirror
- D formation of throat lozenges
Explanation: The correct answer to the question is: formation of throat lozenges
Question 575: Which of the halogen has highest electronegativity ?
- A Fluorine
- B Bromine
- C Iodine
- D Chlorine
Explanation: The correct answer to the question is: Fluorine
Question 576: Phosphorous acid upon thermal decomposition yields phosphoric acid and____________________?
- A Phosphorus
- B Water
- C Phosphine
- D Phosphorus pentoxide
Explanation: The correct answer to the question is: Phosphine
Question 577: Which of the following is a soft Coal?
- A Anthracite
- B Peat
- C Bituminous
- D Lignite
Explanation: The correct answer to the question is: Bituminous
Question 578: The properties which do not depend on mass of the substance are _____________?
- A Colligative properties
- B Extensive properties
- C None of These
- D intensive properties
Explanation: The correct answer to the question is: intensive properties
Question 579: In base catalyzed reaction of carbonyl compound the catalyst___________________?
- A acidic character of reagent
- B increases the nucleophilic character of reagent
- C increases electrophilic character of carbonyl compound
- D both a and b
Explanation: The correct answer to the question is: increases the nucleophilic character of reagent
Question 580: Which one of the following is caustic potash?
- A NaBH4
- B NaCl
- C NaOH
- D KOH
Explanation: The correct answer to the question is: KOH
Question 581: Soil pollution is caused by:_________?
- A Ozone
- B Aerosol
- C Acid rain
- D PAN
Explanation: The correct answer to the question is: Acid rain
Question 582: Why do we determined the boiling point of a liquid?
- A To check its Acidity and Basicity
- B To Check temperature
- C None of These
- D To check its Purity and nature
Explanation: The correct answer to the question is: To check its Purity and nature
Question 583: In benzene sulphonic acid the sulphonic group is attached with benzene ring through ___________________?
- A Sulphur
- B OH
- C Hydrogen
- D Oxygen
Explanation: The correct answer to the question is: Sulphur
Question 584: The halogen which reacts very slowly with halogen is________________?
- A Fluorine
- B Bromine
- C Iodine
- D Chlorine
Explanation: The correct answer to the question is: Iodine
Question 585: The O-O linkage is present in__________?
- A H2S4O6
- B H2SO8
- C H2 S2 O6
- D H2S2O3
Explanation: The correct answer to the question is: H2SO8
Question 586: Why does Ethyl Alcohol show high boiling point then Acetone?
- A Due to high molecular weight
- B Due to its Low molecular weight
- C Due to its Acidic nature
- D Due to Hydrogen bonding
Explanation: The correct answer to the question is: Due to Hydrogen bonding
Question 587: Colour in transition metal compounds is attributed to____________?
- A Absorption of light in UV region
- B Complete ns sub-shell
- C Incomplete (n-1) d sub-shell
- D Small sized metal ions
Explanation: The correct answer to the question is: Incomplete (n-1) d sub-shell
Question 588: In homologous series there is the difference of mass between adjacent members.
- A 14amu
- B 22amu
- C 12amu
- D 18amu
Explanation: The correct answer to the question is: 14amu
Question 589: Elimination bimolecular reactions involve____________________________?
- A first order kinetics
- B third order kinetics
- C second order kinetics
- D zero order kinetics
Explanation: The correct answer to the question is: second order kinetics
Question 590: Formula of haloform is_________________?
- A CX4
- B CH3X
- C CHX3
- D HCOX
Explanation: The correct answer to the question is: CHX3
Question 591: Which one of the following statement is not correct about benzene ?
- A C-H bond length in benzene is 1.09 A?
- B Molecular mass of benzene is 78.108
- C On hydrogenation 208 KJ/mole is liberated
- D Resonance energy of benzene is 150.5 K Cal/mole
Explanation: The correct answer to the question is: Resonance energy of benzene is 150.5 K Cal/mole
Question 592: A 10 volume solution of H2O2 means_______?
- A 10 grams of H2O2 solution liberate 10 mL of O2 at STO
- B 1mL of solution of H2O2 liberates 10 mL of O2 at STP
- C 10 gram equivalents of H2O2 liberates 10 mL of O2 at STP
- D 10 litres of H2O2 liberates 19 mL of O2 at STP
Explanation: The correct answer to the question is: 1mL of solution of H2O2 liberates 10 mL of O2 at STP
Question 593: Nylon-2-nylon-6 is a__________polymer?
- A biodegradable polymer
- B Branched polymer
- C Synthetic polymer
- D Natural polymer
Explanation: The correct answer to the question is: biodegradable polymer
Question 594: What will be the order of reaction of a reaction whose rate can be expressed as R = K [A] [B] ?
- A Three
- B Two
- C One
- D Zero
Explanation: The correct answer to the question is: Two
Question 595: A process used for the Concentration of Ore is________?
- A Distillation
- B Forth flotation
- C Roasting
- D Electrolysis
Explanation: The correct answer to the question is: Forth flotation
Question 596: Which one of the following is not a semiconductor ?
- A Sn
- B Ge
- C Si
- D Se
Explanation: The correct answer to the question is: Sn
Question 597: Which law states that “equal volumes of all gases, at the same temperature and pressure, have the same number of molecules?
- A Avogadro’s law
- B Gay-Lussac’s law
- C Boyle’s law
- D Charles’ law
Explanation: The correct answer to the question is: Avogadro’s law
Question 598: The radio-active element used in heart pacemakers is ___________?
- A Uranium
- B Deuterium
- C Plutonium
- D Radium
Explanation: The correct answer to the question is: Plutonium
Question 599: Which one of the following gives the measure of Organic pollution in water?
- A DO
- B Salinity
- C PH
- D COD
Explanation: The correct answer to the question is: COD
Question 600: The most stable state of Vanadium(V) is
- A V+2
- B V+5
- C V+3
- D V+3
Explanation: The correct answer to the question is: V+2