Top Chemistry MCQS
All Questions for: Top Chemistry MCQS
Question 1: Transition temperature for tin grey & tin white is : _____________?
- A 246.12°C
- B 18°C
- C 128.15°C
- D 96°C
Explanation: The correct answer to the question is: 18°C
Question 2: Beillstein test is used for________?
- A N2
- B CO
- C CO2
- D Cl
Explanation: The correct answer to the question is: Cl
Question 3: Main use of salt in diet is to : ___________?
- A produce small amount of hydrochloric acid required for digestion
- B inclease solubility of food particles in water
- C increase the taste
- D ease the process of cooking
Explanation: The correct answer to the question is: produce small amount of hydrochloric acid required for digestion
Question 4: Quantum numbers are __________ ?
- A Logical values
- B Arithmetical values
- C Leometric values
- D Numerical values
Explanation: The correct answer to the question is: Numerical values
Question 5: Hexamethylene diamine and adipic acid combine to form _____________?
- A Synthetic rubber
- B Polystyrene
- C Natural rubber
- D nylon 6-6
Explanation: The correct answer to the question is: nylon 6-6
Question 6: Which of the following does not give Borax bead test ?
- A Cr
- B A1
- C Cu
- D Ni
Explanation: The correct answer to the question is: A1
Question 7: The concept of ensemble was introduced by____________?
- A Boltzmann
- B Mexwell
- C Gibbs
- D Carnot
Explanation: The correct answer to the question is: Gibbs
Question 8: Which of the following is used in photography?
- A Na2SO3
- B NaHSO3
- C Na2S
- D Na2S2O3
Explanation: The correct answer to the question is: Na2S2O3
Question 9: At higher temperature, Ethyne on reaction with water in the presence of HgSO4 and H2SO4 gives:
- A Acetone
- B Acetaldehyde
- C Ethyl alcohol
- D Acetic acid
Explanation: The correct answer to the question is: Acetaldehyde
Question 10: The number of molecules taking part in the rate determining step is called___________________?
- A Mole of a reaction
- B Order of reaction
- C Rate of reaction
- D Extent of a reaction
Explanation: The correct answer to the question is: Order of reaction
Question 11: The Clemmenson reduction of acetone yields
- A Ethanol
- B Propanol
- C Propane
- D Ethanal
Explanation: The correct answer to the question is: Propane
Question 12: One of the outstanding features of boron is its ability to form__________________?
- A Semiconductors
- B Ionic compounds
- C Molecular crystals
- D Molecular addition compounds
Explanation: The correct answer to the question is: Molecular addition compounds
Question 13: __________ is one of the allotropic modifications of carbon.
- A Silicon
- B Iodine
- C Graphite
- D Diamond
Explanation: The correct answer to the question is: Diamond
Question 14: Which of the following statement is correct ?
- A Cl- < Na+
- B size of Na+ ion < Na atom
- C size of Na atom < Na+ ion
- D size of Cl atoms > Cl- ion
Explanation: The correct answer to the question is: size of Na+ ion < Na atom
Question 15: Basicity of orthophosphoric acid is________?
- A 4
- B 2
- C 5
- D 3
Explanation: The correct answer to the question is: 3
Question 16: Which one of the following carbonate is water insoluble ?
- A (NH4)2CO3
- B Na2CO3
- C CaCO3
- D K2CO3
Explanation: The correct answer to the question is: CaCO3
Question 17: The molecular formula of Sucrose(Sugar) is___________?
- A CHO
- B CHO
- C CH
- D NH
Explanation: The correct answer to the question is: CHO
Question 18: Ammonium cynanate was 1st Inorganic compound that was converted into an Organic compound (in Lab) through boiling water. The organic compound was____.
- A Urea
- B Acetic acid
- C Ethanol
- D Methane
Explanation: The correct answer to the question is: Urea
Question 19: Which of the following effects best explains that o-nitrophenol is insoluble in water?
- A Inductive effect
- B Resonance effect
- C Isomeric effect
- D Intermolecular H-bonding
Explanation: The correct answer to the question is: Intermolecular H-bonding
Question 20: Which of the following shows inert pair effect ?
- A silicon
- B carbon
- C boron
- D tin
Explanation: The correct answer to the question is: tin
Question 21: Which one can form complex ?
- A K
- B Na
- C Cr
- D Li
Explanation: The correct answer to the question is: Li
Question 22: The strongest hydrogen bonding is present in: _____________?
- A Ice
- B Acetone and chloroform
- C Ammonia gas
- D Ethanol
Explanation: The correct answer to the question is: Ice
Question 23: Phosphene gas will be produced if phosphorous acid is subjected to___________________?
- A Decomposition
- B Both b & c
- C Reduction
- D Oxidation
Explanation: The correct answer to the question is: Both b & c
Question 24: Which one is natron ?
- A Na2CO3
- B NaHCO3
- C Na2CO3.H2O
- D Na2CO3.10H2O
Explanation: The correct answer to the question is: Na2CO3.H2O
Question 25: Radiations are harmful as it:___________?
- A Causes skin cancer
- B Alters body tissue
- C Causes anemia
- D is unstable
Explanation: The correct answer to the question is: Causes skin cancer
Question 26: The chemical formula of sodium hypochlorite is________________?
- A NaCLO
- B NaClO3
- C NaClO2
- D NaClO4
Explanation: The correct answer to the question is: NaCLO
Question 27: Which C-X bond has the highest bond energy per mole ?
- A C-I
- B C-F
- C C-C
- D C-Br
Explanation: The correct answer to the question is: C-F
Question 28: In water molecule, Hydrogen & water are held together by ______ bond.
- A Dating
- B Ionic
- C Covalent
- D Hydrogen
Explanation: The correct answer to the question is: Covalent
Question 29: Which of the halogen can displace other three elements ?
- A Iodine
- B Bromine
- C Chlorine
- D Flourine
Explanation: The correct answer to the question is: Flourine
Question 30: A process in which large molecules are broken up into into smaller molecules is called as_____.
- A Refining
- B Cracking
- C Reforming
- D Isomerization
Explanation: The correct answer to the question is: Cracking
Question 31: Which one of the following molecules does not form alcohol when reacts with Grignard reagent ?
- A acetaldehyde
- B formaldehyde
- C carbondioxide
- D propanone
Explanation: The correct answer to the question is: carbondioxide
Question 32: The ore CaSO4.H2O has the general name_______________?
- A Dolomite
- B Gypsum
- C Calcite
- D Plaster of Paris
Explanation: The correct answer to the question is: Gypsum
Question 33: Treating phenol with formaldehyde in the presence of dilute base forms Bakelite. The process involved is_________________?
- A oxidation
- B additional polymertization
- C elimination
- D condensation polymerization
Explanation: The correct answer to the question is: condensation polymerization
Question 34: Which law states that the rate of the effusion of a gas is inversely proportional to the square root of its density?
- A Gay-Lussac’s law
- B None of these
- C Graham’s Law
- D Boyle’s law
Explanation: The correct answer to the question is: Graham’s Law
Question 35: Identify the correct statement regarding CO_______________?
- A it combines with H2O to form carbonic acid
- B it is powerful oxidizing agent
- C it reacts with red blood cells of haemoglobin
- D it is used to prepare aerated drinks
Explanation: The correct answer to the question is: it reacts with red blood cells of haemoglobin
Question 36: Treatment of sucrose with conc. HNO3 gives__________?
- A Laevulinic acid
- B Nitrosucrose
- C Glucose+ fructose
- D Oxalic acid
Explanation: The correct answer to the question is: Nitrosucrose
Question 37: Ethers show functional group isomerism with __________________?
- A carboxylic acid
- B aldehydes
- C alcohols
- D ketones
Explanation: The correct answer to the question is: alcohols
Question 38: which of the following is a non-crystalline solid pair?
- A sucrose. glass
- B glass, table salt
- C wood, glass
- D diamond, wood
Explanation: The correct answer to the question is: wood, glass
Question 39: When two moles of ethyl chloride react with two moles of sodium in the presence of ether what will be formed ?
- A 2 moles of butane
- B 1 mole of ethane
- C 2 moles of ethane
- D 1 mole of butane
Explanation: The correct answer to the question is: 1 mole of butane
Question 40: Polyethylene Glycols are used in the preparation of which type of detergents?
- A All of above
- B Anionic detergents
- C Non-ionic detergents soap
- D Cationic detergents
Explanation: The correct answer to the question is: Non-ionic detergents soap
Question 41: Phenol was isolated by Runge from________________?
- A wood
- B none of these
- C vegetable oil
- D coaltar
Explanation: The correct answer to the question is: coaltar
Question 42: Out of Alkane, Alkene & Alkyne, which one is more acidic?
- A Alkyne
- B All have same
- C Alkane
- D Alkene
Explanation: The correct answer to the question is: Alkyne
Question 43: The coloured glassy mass in borax bead test is due to the formation of___________________?
- A metal silicate
- B metal meta borate
- C metal borate
- D metal boride
Explanation: The correct answer to the question is: metal meta borate
Question 44: The radiations with highest speed are _______.
- A Gamma radiations
- B Alpha radiations
- C AOT
- D Beta radiations
Explanation: The correct answer to the question is: Gamma radiations
Question 45: If steel is heated to a temperature well below red heat and is then cooled slowly, the process is called_________?
- A Nitriding
- B Tempering
- C Quenching
- D Annealing
Explanation: The correct answer to the question is: Annealing
Question 46: If volumetric analysis methyl orange indicator is used when_________?
- A Acid is strong base is weak
- B Bade is strong
- C Acid is strong
- D Acid is weak
Explanation: The correct answer to the question is: Acid is strong
Question 47: The weight of a metal of equivalent of 12 which will give 0.475g of its chloride is_______?
- A 0.12g
- B 0.18g
- C 0.24g
- D 0.16g
Explanation: The correct answer to the question is: 0.18g
Question 48: Which of the following aqueous solutions would have the highest boiling point?
- A 0.20 m NaCl
- B 0.15 m CaCl2
- C 0.20 m glucose
- D 0.25 m sucrose
Explanation: The correct answer to the question is: 0.15 m CaCl2
Question 49: The formula of palmitic acid_________________?
- A C13H27COOH
- B C15H31COOH
- C C17H33COOH
- D C17H35COOH
Explanation: The correct answer to the question is: C15H31COOH
Question 50: Which one of the following is not an alkali metal ?
- A Caesium
- B Rubidium
- C Francium
- D Radium
Explanation: The correct answer to the question is: Radium