Top Chemistry MCQS
All Questions for: Top Chemistry MCQS
Question 701: The Latin word formica means ant. The name formic acid is derived from this Latin word because__________?
- A this acid was first obtained by the distillation of ants
- B this acid, in ancient times, was used to eliminate ant-hills
- C ants are attracted by the odour of this acid
- D this corrosive acid is secreted by ants to drive away their enemies
Explanation: The correct answer to the question is: this acid was first obtained by the distillation of ants
Question 702: Soda lime is a mixture of____________________?
- A Na2O and KOH
- B CaO and NaOH
- C NaOH and Na2O
- D CaO and KOH
Explanation: The correct answer to the question is: CaO and NaOH
Question 703: Ethanol can be converted into ethanoic acid by_________________?
- A Hydration
- B Fermentation
- C Hydrogenation
- D Oxidation
Explanation: The correct answer to the question is: Oxidation
Question 704: The most useful dye for those fabric which can form hydrogen bonds is:_____________?
- A Vat dye
- B Mordent dye
- C Direct dye
- D Acid dye
Explanation: The correct answer to the question is: Direct dye
Question 705: Sodium is not observed in +2 oxidation state because of its__________________?
- A high ionic radius
- B high first ionization potential
- C high second ioniation potential
- D high electronegativity
Explanation: The correct answer to the question is: high second ioniation potential
Question 706: Which one of the following is the weakest acid in water__________________?
- A HI
- B HCI
- C HBr
- D HF
Explanation: The correct answer to the question is: HF
Question 707: Which of the following sulphates is not soluble in water ?
- A Zinc sulphate
- B Potassium sulphate
- C Barium sulphate
- D Sodium sulphate
Explanation: The correct answer to the question is: Barium sulphate
Question 708: A sample of an iron and oxygen ore has a mass of 35.8 grams. The iron in the compound has a mass of 27.9 grams. What is the percent iron in the ore?
- A 78% Fe
- B 74% Fe
- C 77% Fe
- D 75% Fe
Explanation: The correct answer to the question is: 78% Fe
Question 709: The earth absorb radiation in Visible range but emit radiation at the same rate in the:
- A Ultra voilet
- B Infrared
- C All of these
- D Gamma rays
Explanation: The correct answer to the question is: Infrared
Question 710: Product of Nucleophilic Substitution Uni Molecular reaction is in case of chiral substrate?
- A Inversion
- B Retention
- C Recemic Mixture
- D Stereospecific
Explanation: The correct answer to the question is: Recemic Mixture
Question 711: The Electronegativity of Hydrogen is _____.
- A 2.2
- B 1.8
- C 2.8
- D 3.1
Explanation: The correct answer to the question is: 2.2
Question 712: The valency of carbon Atom is __________ ?
- A 4
- B 3
- C 1
- D 2
Explanation: The correct answer to the question is: 4
Question 713: Elements which emit natural radioactivity are known as __________ ?
- A Radio elements
- B Nuclear elements
- C Radioactive elements
- D Active elements
Explanation: The correct answer to the question is: Radioactive elements
Question 714: When 0.01 moles of NaOH are added to a buffer solution, its PH changes from 4.745 to 4.832. What is its?
- A 0.115
- B 0.900
- C 0.215
- D 0.015
Explanation: The correct answer to the question is: 0.115
Question 715: The typical reactions of aldehyde is _____________?
- A Nucleophilic elimination
- B Nucleophilic addition
- C Electrophilic addition
- D Nucleophilic substitution
Explanation: The correct answer to the question is: Nucleophilic addition
Question 716: Which among the following is not a property of Ionic bond _________?
- A Losing of electrons
- B Transfer of electrons
- C Sharing of electrons
- D Gain of electrons
Explanation: The correct answer to the question is: Sharing of electrons
Question 717: One fathom is equal to:__________?
- A 100 cm
- B 6 feet
- C 6 meters
- D 60 feet
Explanation: The correct answer to the question is: 6 feet
Question 718: Silicon differ from silica by a group of__________________?
- A O2
- B Ch3
- C OCH3
- D OH
Explanation: The correct answer to the question is: Ch3
Question 719: A metallic atom loses its valence electron to form a/an _________?
- A an anion
- B none of these
- C an anion – cation
- D a cation
Explanation: The correct answer to the question is: a cation
Question 720: Which compound shows hydrogen bonding ?
- A C2H6
- B C2H5Cl
- C C2H5OH
- D CH3OCH3
Explanation: The correct answer to the question is: C2H5OH
Question 721: Which of the following alloys contain(s) Cu and Zn?
- A Type metal
- B Gun-metal
- C Brass
- D Bronze
Explanation: The correct answer to the question is: Brass
Question 722: Noble gases are so called zero group because they have:_________?
- A Zero Electron Affinity
- B Zero Electronegativity
- C Both A and B
- D Zero Valency
Explanation: The correct answer to the question is: Both A and B
Question 723: Magnetic quantum number specifies___________?
- A All of the above
- B Shape of orbitals
- C Size of orbitals
- D Orientation of orbitals
Explanation: The correct answer to the question is: Orientation of orbitals
Question 724: 2-Butyne contains:______________?
- A both sp and sp hybridised carbon atoms
- B sp hybridised carbon atoms only
- C both sp and sp hybridised carbon atoms
- D sp hybridised carbon atoms only
Explanation: The correct answer to the question is: both sp and sp hybridised carbon atoms
Question 725: Acetaldehyele cyanohydrin on acid hydrolysis yields___________________?
- A Tartaric acid
- B Propanoic acid
- C Valeric acid
- D Lactic acid
Explanation: The correct answer to the question is: Lactic acid
Question 726: How many isomeric aldoses are possible for the molecular formula C6H12O6?
- A 7
- B 2
- C 16
- D 4
Explanation: The correct answer to the question is: 16
Question 727: Lead battery is secondary battery the paste used in it is______________?
- A Magnese dioxide
- B Zinc chloride
- C AOT
- D Ammonium chloride
Explanation: The correct answer to the question is: AOT
Question 728: Identify the Lucas reagent among the following
- A Conc. HNO & Anhydrous ZnCl
- B Conc. HCl & Anhydrous ZnCl
- C Dil. HCl & hydrated ZnCl
- D Conc. HNO & Anhydrous MgCl
Explanation: The correct answer to the question is: Conc. HCl & Anhydrous ZnCl
Question 729: The molecular formula for cholesterol is C27 H46 O. What are the degrees of unsaturation for this compound?
- A 7
- B 5
- C 6
- D 8
Explanation: The correct answer to the question is: 5
Question 730: The element having electronic configuration [kr] 4d10, 4f14,5s2,5p6,5d1,6s2 belongs to __________?
- A f-Block
- B P-Block
- C d-Block
- D S-Block
Explanation: The correct answer to the question is: f-Block
Question 731: Which compound will readily undergo sulphonation ?
- A Nitro benzene
- B Benzene
- C Toluene
- D Chlorobenzene
Explanation: The correct answer to the question is: Toluene
Question 732: If a compound contains 24 gram of carbon 2 gram of hydrogen and 64 gram of oxygen then its empirical formula will be________?
- A CH2
- B C2H2O4
- C CHO2
- D CH2O
Explanation: The correct answer to the question is: CHO2
Question 733: The Ionization energy of Hydrogen is __________?
- A 13.6ev
- B 10.54ev
- C 12.54ev
- D 17.56ev
Explanation: The correct answer to the question is: 13.6ev
Question 734: Which of the following aldehydes shows rapid reaction with sodium nitroprusside ?
- A accetaldehyde
- B benzaldehyde
- C acetone
- D formaldehyde
Explanation: The correct answer to the question is: acetone
Question 735: A helium nucleus comprising of two protons and two neutrons with a charge of 2e is _________ ?
- A Gamma particle
- B Beta particle
- C Negative particle
- D Alpha particle
Explanation: The correct answer to the question is: Alpha particle
Question 736: When benzene is substituted by halogens only which one of the following halogens only which one of the following halogens is given the number one position in the ring while writing the name of compound ?
- A Iodine
- B Chlorine
- C Fluorine
- D Bromine
Explanation: The correct answer to the question is: Iodine
Question 737: The molecules of which gas have highest speed?
- A CH at 300 K
- B N at 1,027C
- C O at 0C
- D H at -73C
Explanation: The correct answer to the question is: H at -73C
Question 738: Boron is non metal while other elements of IIIA group are metals. This is because______________?
- A it has small size
- B it forms molecular addition compounds
- C all of the above
- D it has high nuclear charge
Explanation: The correct answer to the question is: all of the above
Question 739: Which of the following will not give addition reaction with NaHSO3________________?
- A None of the above
- B HCHO
- C CH3-CH2-CHO
- D CH3CHO
Explanation: The correct answer to the question is: CH3-CH2-CHO
Question 740: The common oxidation state of lanthanides is_________?
- A +2
- B +4
- C +3
- D +1
Explanation: The correct answer to the question is: +3
Question 741: The decomposition of nitroglycerine is an example of:
- A Autocatalytic reaction
- B Enzyme catalytic reaction
- C Self catalytic reaction
- D induced catalysis
Explanation: The correct answer to the question is: Autocatalytic reaction
Question 742: Which of the following will give phosphoric acid one reaction with water_________________?
- A P2O3
- B P2O5
- C PCI5
- D All of the above
Explanation: The correct answer to the question is: All of the above
Question 743: Which one of the following serve as aquatic solar fuel cell:
- A Virus
- B Algae
- C Bacteria
- D Fungi
Explanation: The correct answer to the question is: Algae
Question 744: The Bond Energy of H-F is________?
- A 562kJ/mol
- B None
- C 456kJ/mol
- D 281kJ/mol
Explanation: The correct answer to the question is: 562kJ/mol
Question 745: Barometer was invented by _______?
- A Torricelli
- B Pascal
- C Newton
- D Huygen
Explanation: The correct answer to the question is: Torricelli
Question 746: Which of the following do not give aldol condensation reactions ?
- A diemthyl ketone
- B formaldehyde
- C acetaldehyde
- D propionaldehyde
Explanation: The correct answer to the question is: formaldehyde
Question 747: Electromeric effect is ____________?
- A Permanent effect
- B Operate due to electronegativity difference
- C temporary effect
- D None of the above
Explanation: The correct answer to the question is: temporary effect
Question 748: In electrolysis of NaCl the product obtained at cathode is_______.
- A Remain at the bottom of the cell
- B Chloride ions
- C Both
- D Sodium ions
Explanation: The correct answer to the question is: Sodium ions
Question 749: The term internal salt refers to_____________________?
- A Dipolar character of amino acids
- B Basic character of amino acids
- C Non-polar structure of amino acids
- D Acidic character of amino acids
Explanation: The correct answer to the question is: Dipolar character of amino acids
Question 750: The composition of brown ring in nitrate test is_________________?
- A FeSO4.No3
- B FeSO4.N2o
- C FeSO4.No
- D FeSO4.No2
Explanation: The correct answer to the question is: FeSO4.No