Top Chemistry MCQS
All Questions for: Top Chemistry MCQS
Question 401: Nucleus of an atom was discovered by___________?
- A Rutherford
- B Goldstein
- C James Chadwick
- D J J Thomson
Explanation: The correct answer to the question is: Rutherford
Question 402: Urea as a fertilizer contains:____________?
- A 57% N
- B 46% N
- C 73% N
- D 53% N
Explanation: The correct answer to the question is: 46% N
Question 403: Introduction of nitro group in a molecule is called___________________?
- A nitration
- B sulphonation
- C halogenation
- D amination
Explanation: The correct answer to the question is: nitration
Question 404: The most appropriate method for separating a large quantity of a mixture of nonvolatile, nonpolar organic compounds would be__________?
- A Column chromatography
- B Gas chromatography
- C Distillation
- D Extraction
Explanation: The correct answer to the question is: Column chromatography
Question 405: Which metal is used as a reducing agent in Smelting______?
- A Zn
- B Cu
- C C
- D Al
Explanation: The correct answer to the question is: C
Question 406: The molar mass of an organic acids is determined by____________?
- A Depression of freezing point
- B Volumetric method
- C Osmosis method
- D Victor Meyer’s method
Explanation: The correct answer to the question is: Volumetric method
Question 407: Alkyl halides are considered to be very reactive compounds towards nucleophile because_________________?
- A they have a nucleophilic carbon & a good leaving group
- B they have an electrophilic carbon
- C they have an electrophilic carbon & a good leaving group
- D they have an electrophilic carbon & a bad leaving group
Explanation: The correct answer to the question is: they have an electrophilic carbon & a good leaving group
Question 408: According to Journal of Biological Chemistry 158, human brain and heart are composed of ________water?
- A 73%
- B 75%
- C 81%
- D 89%
Explanation: The correct answer to the question is: 73%
Question 409: Methyl alcohol on oxidation with acidified K2Cr2O7 gives__________?
- A CH3CHO
- B CH3COOH
- C CH3COCH3
- D HCOOH
Explanation: The correct answer to the question is: HCOOH
Question 410: Orthoboric acid is 2.6% soluble in water at 40?C and ___________at 107°C.
- A 37%
- B 27%
- C 26%
- D <2.6%
Explanation: The correct answer to the question is: 37%
Question 411: Tincal is a mineral of___________________?
- A C
- B B
- C A1
- D Si
Explanation: The correct answer to the question is: B
Question 412: Which ion will have maximum value of heat of hydration ?
- A Mg+2
- B Cs+
- C A1+3
- D Ba+
Explanation: The correct answer to the question is: A1+3
Question 413: Which is artificial manmade fiber?
- A None of these
- B Boron
- C Saffron
- D Rayon
Explanation: The correct answer to the question is: Rayon
Question 414: Acetylene gives:
- A Red precipitate with both the reagents
- B White precipitate with CuCl and red precipitate with AgNO
- C White precipitate with AgNO and red precipitate with CuCl
- D White precipitate with both the reagents
Explanation: The correct answer to the question is: White precipitate with AgNO and red precipitate with CuCl
Question 415: Alkanes are also known as________________?
- A unsaturated hydrocarbon
- B saturated hydrocarbon
- C both A & C
- D paraffins
Explanation: The correct answer to the question is: paraffins
Question 416: Which element is necessary for normal leaf development ?
- A Ca
- B Si
- C Ba
- D Mg
Explanation: The correct answer to the question is: Ca
Question 417: Isotopes differs in______________________?
- A position in the periodic table
- B chemical properties
- C arrangement of electrons in orbitals
- D properties depend upon mass
Explanation: The correct answer to the question is: properties depend upon mass
Question 418: Poisonous gas present in the exhaust fumes of a jet plane is__________?
- A Carbon monoxide
- B Flurocarbon
- C Methane
- D C2H2
Explanation: The correct answer to the question is: Carbon monoxide
Question 419: Example of ‘globular’ proteins is __________ ?
- A Secondary proteins
- B Primary protein
- C Peptide
- D Enzymes
Explanation: The correct answer to the question is: Enzymes
Question 420: The heat energy produced when the human body metabolises 1 gram of fat is__________?
- A 1 KJ
- B 29 KJ
- C 39 KJ
- D 30 KJ
Explanation: The correct answer to the question is: 39 KJ
Question 421: The chemical symbol for silver is __________?
- A At
- B Sv
- C Au
- D Ag
Explanation: The correct answer to the question is: Ag
Question 422: The process in which no heat enters or leave the system known as _____________?
- A Isothermal
- B Isochoric
- C Isobaric
- D adiabatic
Explanation: The correct answer to the question is: adiabatic
Question 423: Hookworm is a parasitic worm that infects ______?
- A liver
- B lungs
- C small intestine
- D large intestine
Explanation: The correct answer to the question is: small intestine
Question 424: In isothermal process?
- A temperature of the system remains constant
- B No heat enter or leave the system
- C Pressure of the system remains constant
- D Volume of the system remains unchanged
Explanation: The correct answer to the question is: temperature of the system remains constant
Question 425: Electric bulb filament is made of__________?
- A Lead
- B Aluminum
- C Copper
- D Tungsten
Explanation: The correct answer to the question is: Tungsten
Question 426: Argon gas was discovered by_______?
- A Dalton
- B Lockerey
- C Rayleigh
- D Ramsay
Explanation: The correct answer to the question is: Ramsay
Question 427: Which statement is incorrect ?
- A All the metals form acidic oxides
- B All the metals form positive ions
- C All the metals are good conductor of electricity
- D All the metals are good conductor of heat
Explanation: The correct answer to the question is: All the metals form acidic oxides
Question 428: Water gas heated at 450?C and 200 atm pressure in the presence of ZnO+Cr2O3 will produce________________?
- A carbonic acid
- B methanol
- C methane
- D methanol
Explanation: The correct answer to the question is: methanol
Question 429: Ozonolysis of acetylene gives:
- A None
- B Glycol
- C Formaldehyde
- D Glyoxal then formic acid
Explanation: The correct answer to the question is: Glyoxal then formic acid
Question 430: Ethylene diammine is ligand________?
- A Bi dentate
- B tri dentate
- C Poly dentate
- D mono dentate
Explanation: The correct answer to the question is: Bi dentate
Question 431: The PH of Tears is __________?
- A 8.2
- B 7.4
- C 7.8
- D 7.0
Explanation: The correct answer to the question is: 7.4
Question 432: The substance used in cancer therapy is___________?
- A Fe
- B Ni
- C Rn
- D Co
Explanation: The correct answer to the question is: Co
Question 433: Boric acid cannot be used__________________?
- A For enamel and glazes
- B In soda bottles
- C For washing eyes
- D As antiseptic in medicine
Explanation: The correct answer to the question is: In soda bottles
Question 434: The hydrolysis of Benzenetrizonide will yield three moles of____________________?
- A Glyoxime
- B Glycol
- C Benzaldehyde
- D Glyoxal
Explanation: The correct answer to the question is: Glyoxal
Question 435: Strong Nucleophile in polar aprotic solvent?
- A Bromide ion
- B Flouride ion
- C Iodide ion
- D Chloride ion
Explanation: The correct answer to the question is: Flouride ion
Question 436: The salt that gives the aqueous solution with pH less than 7, is called as____________?
- A Amphoteric salt
- B Neutral salt
- C Acidic salt
- D Basic salt
Explanation: The correct answer to the question is: Acidic salt
Question 437: Which one of the following is also known as tartaric acid ?
- A 2 3-dihydroxy butance 1 4 -dioic acid
- B 2 3 -dihydroxy butanioc acid
- C 2 2 -dihydroxy butanoic acid
- D 2 3 -dihydroxy butanedioic acid
Explanation: The correct answer to the question is: 2 3-dihydroxy butance 1 4 -dioic acid
Question 438: The law of traids is applicable to__________?
- A Cl, Br, I
- B F, Cl, Br
- C Li, Be, B
- D Na, K, Rb
Explanation: The correct answer to the question is: Cl, Br, I
Question 439: Actinides are the elements with atomic numbers from __________?
- A 97 to 104
- B 89 to 103
- C 101 to 115
- D 36 to 43
Explanation: The correct answer to the question is: 89 to 103
Question 440: Marsh gas is _________?
- A Hydrogen
- B Nitrogen
- C Methane
- D Ethane
Explanation: The correct answer to the question is: Methane
Question 441: Transition elements, in general, exhibit the following properties, except one. Name that property?
- A Tendency to form complexes
- B Formation of alloys
- C Natural Radioactivity
- D Variable oxidation state
Explanation: The correct answer to the question is: Natural Radioactivity
Question 442: Which one of the followings possesses melting point below 0°C?
- A Carbon
- B Nitrogen
- C Bismuth
- D Phosphorus
Explanation: The correct answer to the question is: Nitrogen
Question 443: Acetone reacts with HCN to form a cyanohydrin. It is an example of________________?
- A nucleophilic addition
- B nucleophilic substitution
- C electrophilic substitution
- D electronphilic addition
Explanation: The correct answer to the question is: nucleophilic addition
Question 444: An alcohol produced during the formation of a soap process.
- A Ethylene glycol
- B Glycerol
- C Ethanol
- D Butanol
Explanation: The correct answer to the question is: Glycerol
Question 445: The quantity of petrol can be increased by ___________?
- A Refining
- B Reforming
- C Cracking
- D Induction fueling
Explanation: The correct answer to the question is: Cracking
Question 446: The oxidation of isopropyl alcohol will yield___________________?
- A Propanoic acid
- B Propanone
- C propane
- D Propanol
Explanation: The correct answer to the question is: Propanone
Question 447: Which of the following is not an amino acids_____________________?
- A glycine
- B aspartic acids
- C glumatic acid
- D lactic acid
Explanation: The correct answer to the question is: lactic acid
Question 448: Ethanal is prepared industrially by air oxidation of ethylene using palladium chloride as catalyst and _________ as promoter?
- A CuCl2
- B Cu2Cl2
- C PdCl2
- D PbCl2
Explanation: The correct answer to the question is: CuCl2
Question 449: Species are formed in one step of reaction mechanism and used up in another step are called:
- A inhibitor
- B activated complex
- C Catalyst
- D Intermediate
Explanation: The correct answer to the question is: Intermediate
Question 450: The composition of ‘ Golden spangles is_________?
- A As2Cr2O7
- B PbI2
- C BaCrO4
- D PbCrO4
Explanation: The correct answer to the question is: PbCrO4