Top Chemistry MCQS
All Questions for: Top Chemistry MCQS
Question 351: Which one exhibits aldol condensation____________________?
- A CH3COCH3
- B HCHO
- C Cl3CCHO
- D C6H5CHO
Explanation: The correct answer to the question is: CH3COCH3
Question 352: The number of ions produced by [Pt(NH3)]Cl2?
- A 5
- B 4
- C 3
- D 2
Explanation: The correct answer to the question is: 3
Question 353: Which electronic configuration corresponds to an element of group IIIA ?
- A 1s2 2s2 2p6 3s2 3p6 4s2 3d1
- B 1s2 2s2 2p4
- C 1s2 2s2 2p3
- D 1s2 2s2 2p6 3s2 3p1
Explanation: The correct answer to the question is: 1s2 2s2 2p6 3s2 3p1
Question 354: The organic acid that can be made from ethanol is_________________?
- A Formic acid
- B Butanoic acid
- C Acetic acid
- D Citric acid
Explanation: The correct answer to the question is: Acetic acid
Question 355: Atomic mass of an atom is present in the __________?
- A Orbital
- B Orbit
- C Shell
- D Nucleus
Explanation: The correct answer to the question is: Nucleus
Question 356: Evaporation is_____________?
- A Surface Process
- B Endothermic Reaction
- C Continuous Process
- D All of these.
Explanation: The correct answer to the question is: All of these.
Question 357: Ketones and aldehydes can be distinguished using ____________?
- A Tollens reagent
- B Fehling solution
- C Bendict solution
- D None of These
Explanation: The correct answer to the question is: Tollens reagent
Question 358: What is the chemical name of Oil of Vitriol?
- A Sulphuric Acid
- B Muriatic Acid
- C Nitric Acid
- D Hydrochloric Acid
Explanation: The correct answer to the question is: Sulphuric Acid
Question 359: Ostwald’s dilution law applicable to:
- A Strong electrolytes
- B Weak electrolytes
- C Non electrolytes
- D All electrolytes
Explanation: The correct answer to the question is: Weak electrolytes
Question 360: The PH of pure water at 25°C, kw=1×10-4____________?
- A 14
- B None of above
- C 7
Explanation: The correct answer to the question is: 7
Question 361: The Substance which resist in change in PH is called?
- A Neutralization
- B Active transport
- C Osmosis
- D Buffer
Explanation: The correct answer to the question is: Buffer
Question 362: In borax bead test which compound is formed_________?
- A Ortho burate
- B Tetra borate
- C Meta borate
- D Double oxide
Explanation: The correct answer to the question is: Meta borate
Question 363: Molecular orbital Theory is also called_________?
- A π and σ bonding theory
- B Band theory
- C Antibondingtheory
- D Bonding theory
Explanation: The correct answer to the question is: Antibondingtheory
Question 364: In which compound of Xenon the oxidation state of Xenon is + 6?
- A Na4XeO6
- B XeOF2
- C XeF4
- D XeOF4
Explanation: The correct answer to the question is: XeOF4
Question 365: The discovery of neutron became very late because _______ ?
- A It is present in nucleus
- B It does not carry any charge
- C It does not move
- D It is a fundamental particle
Explanation: The correct answer to the question is: It does not carry any charge
Question 366: Which of the following phenomenon is considered responsible for Global Warming?
- A Monsoon
- B Greenhouse effect
- C Fire in coal mines
- D Dry farming
Explanation: The correct answer to the question is: Greenhouse effect
Question 367: Stainless steel contains___________?
- A Fe+Ni+Cu
- B Fe+ Cr+Cu
- C Fe+Cr+Ni
- D Cu+C+Ni
Explanation: The correct answer to the question is: Fe+Cr+Ni
Question 368: The heaviest subatomic particle among the following is_________?
- A All have mass
- B Proton
- C Neutron
- D Electron
Explanation: The correct answer to the question is: Neutron
Question 369: The whole universe is made up of almost _______of Hydrogen?
- A 70%
- B 50%
- C 80%
- D 60%
Explanation: The correct answer to the question is: 70%
Question 370: Ethyl chloride with nascent hydrogen produces_________________?
- A butane
- B methane
- C propane
- D ethane
Explanation: The correct answer to the question is: ethane
Question 371: Water Gas is a mixture of two gases Hydrogen & Carbon monoxide, while separating Hydrogen gas by liquification process which one is liquefied first__?
- A Hydrogen Gas
- B None of them
- C Both at same time
- D Carbon Monoxide Gas
Explanation: The correct answer to the question is: None of them
Question 372: Who used the term Concentrationwindow to draw the arbitrary lines of demarcation
- A Einstein
- B Schwartz
- C S.E.Manhan
- D Dr.A.Walash
Explanation: The correct answer to the question is: Schwartz
Question 373: When Ammonia is used as a refrigerant in vapour compression cycle?
- A Both a & b
- B Cu Tubing used
- C Steel tubes used
- D Material does not effect by refrigerant
Explanation: The correct answer to the question is: Steel tubes used
Question 374: The compound C3H4 has a triple bond, which is indicated by its reaction with____________?
- A Ammonical silver nitrate
- B Bromine water
- C Fehling solution
- D Bayer’s reagent
Explanation: The correct answer to the question is: Ammonical silver nitrate
Question 375: Law of mass action was proposed by Goldberg and Peter Waage in _________?
- A 1888
- B 1864
- C None of These
- D 1866
Explanation: The correct answer to the question is: 1864
Question 376: Quality of petrol is measured by___________?
- A Reforming
- B Refining
- C Heptane number
- D octane number
Explanation: The correct answer to the question is: octane number
Question 377: Greater the heat of neutralization the acid will be____________?
- A None of the above
- B more stronger
- C More weaker
- D Not related to acid strength
Explanation: The correct answer to the question is: more stronger
Question 378: The mass of 3.2 moles of ammonia (NH3) gas?
- A 54.4 grams
- B 53.4 grams
- C 56.4 grams
- D 55.4 grams
Explanation: The correct answer to the question is: 54.4 grams
Question 379: I3( Tri-iodine) has shape_________?
- A Linear
- B Square bipyramidal
- C Trigonal bipyramidal
- D Both A and C
Explanation: The correct answer to the question is: Linear
Question 380: Which one of the following alcohol has greater boiling point___________________?
- A methanol
- B glycerol
- C ethylene glaycol
- D ethanol
Explanation: The correct answer to the question is: glycerol
Question 381: The preparation of benzene from acetylene can also be said as_________________?
- A Polymerization
- B Dehydration
- C Oxidation
- D Condensation
Explanation: The correct answer to the question is: Polymerization
Question 382: A elements are named as alkali metals because_______________?
- A Their oxides are basic
- B They are found in earth
- C Their oxide and hydroxides are water soluble
- D Both A & B
Explanation: The correct answer to the question is: Both A & B
Question 383: The reciprocal of the coefficent of viscosity is called__________?
- A Density
- B Fluidity
- C Specific gravity
- D Absorbance
Explanation: The correct answer to the question is: Fluidity
Question 384: Carbon in wrought iron is present as_________?
- A Iron carbide
- B Partly as iron carbide and partly as graphite
- C Graphite
- D Silicon carbide
Explanation: The correct answer to the question is: Iron carbide
Question 385: Which alkyl halide has the highest reactivity for a particular alkyl group ?
- A R-I
- B R-F
- C R-C
- D R-Br
Explanation: The correct answer to the question is: R-I
Question 386: Identify among the following which has Lowest energy of electron in 1st shell.
- A Be+³
- B He+¹
- C H
- D Li+²
Explanation: The correct answer to the question is: Be+³
Question 387: The reaction of Lucas reagent is the fastest with_________?
- A CH3CH2OH
- B (CH3)2CHOH
- C (CH3)3COH
- D CH3(CH2)OH
Explanation: The correct answer to the question is: (CH3)3COH
Question 388: The process by which a substance absorbs moisture upon exposure to atmosphere is called?
- A Efflorescence
- B Deliquescence
- C Dehydrogenation
- D Desalination
Explanation: The correct answer to the question is: Deliquescence
Question 389: A substance is analyzed and found to have an emperical formula of CH2 and a molar mass of 56g/mole. What is the molecular formula of the compound?
- A C4H8
- B C2H4
- C C5H10
- D C3H6
Explanation: The correct answer to the question is: C4H8
Question 390: Z number for chlorine is __________?
- A 35.5
- B 21
- C 17
Explanation: The correct answer to the question is: 17
Question 391: Hydrocarbon is formed when Grignard reagent is treated with___________?
- A CH3OH
- B H2O
- C None of the above
- D Both a and b
Explanation: The correct answer to the question is: H2O
Question 392: Substance which is found in dried up lakes of Tibet and California is_______________?
- A Colemanite
- B Boric acid
- C Tincal
- D Calcium carbonate
Explanation: The correct answer to the question is: Tincal
Question 393: Electronic Configuration of Calcium (Ca) atom may be written as________?
- A Ar, 4s2
- B Ne, 4p2
- C Ne, 4s2
- D Kr,4p2
Explanation: The correct answer to the question is: Ar, 4s2
Question 394: Which of the following will decompose to produce litharge_________________?
- A Pb3O4
- B All of the above
- C PbO2
- D Pb2O
Explanation: The correct answer to the question is: Pb3O4
Question 395: The phenomenon of negative catalysis is also known as:
- A inhibition
- B Self catalysis
- C auto catalysis
- D Enzyme catalysis
Explanation: The correct answer to the question is: inhibition
Question 396: Which of the following is not a use of formaldehyde ?
- A in making throat lozenges
- B in making medicine urotropine
- C in silvery mirror
- D in making acetic acid
Explanation: The correct answer to the question is: in making acetic acid
Question 397: Upto ___________________ C atoms alkanes are gases?
- A 3
- B 6
- C 4
- D 2
Explanation: The correct answer to the question is: 4
Question 398: When the radiation of light is passed through a prism, it undergoes __________?
- A refraction
- B reflection
- C diffraction
- D interference
Explanation: The correct answer to the question is: refraction
Question 399: What is the mass percent of silver in silver notrate, AgNO3?
- A 64.5%
- B 61.5%
- C 65.6%
- D 63.5%
Explanation: The correct answer to the question is: 63.5%
Question 400: 24g of an unknown gas occupied 8.4dm3at STP, Identify the gas among the following
- A CH
- B CH
- C SO
- D SO
Explanation: The correct answer to the question is: SO