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Some Basic Concepts of Chemistry NEET Questions Objective for Students
Quick Quiz
Spiess, the residue which settles down during smelting contains mainly arsenides of
(A) Co
(B) Ni
(C) None of these
(D) Both (A) & (B)
Option d – Both (A) & (B)
‘Mn’ shows oxidation states from +2 to +7. The most strongly oxidizing state known in aqueous solution is
(A) +2
(B) +3
(C) +4
(D) +7
Option d – +7
The sulfide of transition metal insoluble in 50% HNO3 is
(A) Hg
(B) Cr
(C) Cu
(D) Cd
Option a – Hg
The oxidation state of mercury in Nessler’s reagent is
(A) +2
(B) +1
(C) Zero
(D) -1
Option a – +2
The correct order of increasing acidic nature for the following is
(A) MnO < Mn2O3 < MnO2 < MnO3 < Mn2O7
(B) MnO2 < MnO < Mn203 < MnO3 < Mn2O7
(C) Mn2O7 < MnO3 < MnO2 < Mn2O3 < MnO
(D) None of these
Option a – MnO < Mn2O3 < MnO2 < MnO3 < Mn2O7
Which oxide of manganese is amphoteric?
(A) MnO
(B) MnO2
(C) Mn2O7
(D) Mn2O3
Option b – MnO2
In the first transition, series the highest stable oxidation state is shown by
(A) Cr
(B) Mn
(C) V
(D) Fe
Option b – Mn
Gold can show oxidation states
(A) +1, +3
(B) +1, +2
(C) +1, +2, +3
(D) +2, +3
Option a – +1, +3
Misch metal contains iron to the extent of
(A) 25%
(B) 15%
(C) 5%
(D) 20%
Option c – 5%
In the first transition series element which is least abundant in the earth’s crust is
(A) Cr
(B) Ti
(C) Co
(D) Sc
Option d – Sc
Adam’s catalyst contains
(A) TiCl4
(B) Pt/PtO
(C) (CH3)2SiCl2
(D) None of these
Option b – Pt/PtO
Which of the following compounds has color but no unpaired electrons?
(A) KMnO4
(B) K₂MnO4
(C) MnSO4
(D) MnCl2
Option a – KMnO4
Which of the following has the greatest electron affinity?
(A) I
(B) Br
(C) F
(D) Cl
Option d – Cl
Which of the following is used in the preparation of chlorine?
(A) Both MnO2 and KMnO4
(B) Only KMnO4
(C) Only MnO₂
(D) Either MnO2 or KMnO4
Option a – Both MnO2 and KMnO4
Which of the following statement is true?
(A) Silicon exhibits 4 coordination numbers in its compound
(B) Bond energy of F2 is less than Cl₂
(C) Mn(III) oxidation state is more stable than Mn(II) in an aqueous state.
(D) Elements of 15th gp show only+3 and +5 oxidation states.
Option b – Bond energy of F2 is less than Cl₂
When H₂S is passed through Hg₂ we get
(A) HgS
(B) HgS+Hg₂S
(C) Hg₂S+Hg
(D) Hg₂S
Option c – Hg₂S+Hg
Elements of which of the following bonds will be most readily?
(A) Oxygen family
(B) Nitrogen family
(C) Halogens
(D) Alkali metals
Option c – Halogens
A solution of potassium bromide is treated with each of the following. Which one would liberate bromine?
(A) Hydrogen iodide
(B) Sulphur dioxide
(C) Chlorine
(D) Iodine
Option c – Chlorine
Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. This is due to
(A) the Strong affinity of HCl gas for moisture in air results in forming of droplets of the liquid solution which appears like a cloudy smoke.
(B) Due to a strong affinity for water, conc. HCl pulls moisture of air towards self. The moisture forms droplets of water and hence the cloud.
(C) Conc. HCl emits strongly smelling HCl gas all the time
(D) Oxygen in the air reacts with emitted HCl gas to form a cloud of Cl₂ gas.
Option c – Conc. HCl emits strongly smelling HCl gas all the time
The shape of O₂F2 is similar to that of
(A) C₂F2
(B) H₂O
(C) H₂F2
(D) C₂H₂
Option b – H₂O
The acid having O-O bond is :
(A) H₂S₂O3
(B) H₂S₂O6
(C) H₂S₂O8
(D) H₂S406
Option c – H₂S₂O8
Which of the following is not oxidized by O3?
(A) KI
(B) FeSO4
(C) KMnO4
(D) K₂MnO4
Option c – KMnO4
A gas that cannot be collected over water is
(A) N₂
(B) O2
(C) SO2
(D) PH3
Option c – SO2
The acidity of diprotic acids in aqueous solutions increases in the order
(A) H₂S <H₂Se <H₂Te
(B) H₂Se <H₂S <H₂Te
(C) H₂Te <H₂S <H₂Se
(D) H₂Se <H₂Te <H₂S
Option a – H₂S
The date of manufacture of food items fried in oil should be checked before buying because oils become rancid due to:
(a) Oxidation
(b) Reduction
(c) Hydrogenation
(d) Decrease viscosity
Option a – Oxidation
In a reaction, what is the loss of hydrogen by a substance called?
(a) Reduction
(b) Oxidation
(c) Hydronization
(d) Both reduction and hydronization
Option b – Oxidation
The bleaching action of chlorine is due to which reaction?
(a) Oxidation
(b) Hydrolysis
(c) Redox
(d) Decomposition
Option a – Oxidation
Starch iodide paper is used to test for the presence of:
(a) Iodine
(b) Iodide iron
(c) Oxidizing agent
(d) Reducing agent
Option c – Oxidizing agent
In a reaction, the concentration of principal reactants is equal to the concentration of products. This state of a reaction is called as:
(a) Reversible reaction
(b) Chemical equilibrium
(c) Irreversible reaction
(d) Forward reaction
Option b – Chemical equilibrium
What is the role of a positive catalyst in a chemical reaction?
(a) It increases the rate of reaction.
(b) It decreases the rate of reaction.
(c) It increases the yield of products.
(d) It provides better purity of the products.
Option c – It increases the yield of products
The solubility of calcium oxide in water increases by lowering the temperature. Thus, the dissolution process is:
(a) Endothermic
(b) Exothermic
(c) Non-thermic
(d) Cannot be decided
Option b – Exothermic
Corrosion is the oxidative deterioration of a metal, such as tarnishing of silver, rusting of iron, and development of a green coating on copper and bronze. Corrosion is an example of:
(a) Fast reaction
(b) Slow reaction
(c) Homogeneous reaction
(d) Heterogeneous reaction
Option b – Slow reaction
The oxidation number of an element in a compound is evaluated on the basis of certain rules. Which of the following is incorrect in this respect?
(a) The oxidation number of hydrogen is always +1.
(b) The algebraic sum of all the oxidation numbers in a compound is zero.
(c) An element in the free or the uncombined state bears an oxidation number of zero.
(d) In all its compounds, the oxidation number of fluorine is -1.
Option a – The oxidation number of hydrogen is always +1
The process of gaining electrons is known as:
(a) Oxidation
(b) Reduction
(c) Radiation
(d) Both oxidation and reduction
Option b – Reduction
When a substance loses oxygen during a reaction, it is called:
(a) Corrosion
(b) Reduction
(c) Oxidation
(d) Both corrosion and oxidation
Option b – Reduction
Which of the following reactions represent(s) a redox process?
(a) Electrochemical process for the extraction of highly reactive metals and nonmetals.
(b) Manufacturing of caustic soda.
(c) Corrosion of metals.
(d) All of the above
Option d – All of the above
4d, 5p, 5f, and 6p orbitals are arranged in the order of decreasing energy. The correct option is:
(A) 6p > 5f > 5p > 4d
(B) 5p > 5f > 4d > 6p
(C) 5f > 6p > 4d > 5p
(D) 5f > 6p > 5p > 4d
Option d – 5f > 6p > 5p > 4d
Among the following, the one that is not a greenhouse gas is:
(A) Methane
(B) Ozone
(C) Sulphur dioxide
(D) Nitrous oxide
Option c – Sulphur dioxide
Among the following, the narrow-spectrum antibiotic is:
(A) Ampicillin
(B) Amoxycillin
(C) Chloramphenicol
(D) Penicillin G
Option d – Penicillin G
The method used to remove the temporary hardness of water is:
(A) Clark’s method
(B) Ion-exchange method
(C) Synthetic resins method
(D) Calgon’s method
Option a – Clark’s method
Which of the following series of transitions in the spectrum of the hydrogen atom falls in the visible region?
(A) Balmer series
(B) Paschen series
(C) Brackett series
(D) Lyman series
Option a – Balmer series
If the rate constant for a first-order reaction is k, the time (t) required for the completion of 99% of the reaction is given by:
(A) t = 6.909/k
(B) t = 4.606/k
(C) t = 2.303/k
(D) t = 0.693/k
Option b – t = 4.606/k
Under isothermal conditions, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is (Given that 1 L bar = 100 J):
(A) 5 kJ
(B) 25 J
(C) -30 J
(D) 30 J
Option d – 30 J
Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor. M is:
(A) Mg
(B) Ca
(C) Sr
(D) Be
Option a – Mg
The mixture that forms the maximum boiling azeotrope is:
(A) Ethanol + water
(B) Acetone + carbon disulphide
(C) Heptane + Octane
(D) Water + nitric acid
Option d – Water + nitric acid
Which of the following alkanes cannot be made in good yield by the Wurtz reaction?
(A) n-Butane
(B) n-Hexane
(C) 2,3-Dimethylbutane
(D) n-Heptane
Option d – n-Heptane
The freezing point depression constant (Kf) of benzene is 5.12 K kg mol⁻¹. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off up to two decimal places):
(A) 0.60 K
(B) 0.20 K
(C) 0.80 K
(D) 0.40 K
Option d – 0.40 K
The reaction between acetone and methylmagnesium chloride followed by hydrolysis will give:
(A) Isobutyl alcohol
(B) Isopropyl alcohol
(C) Sec. butyl alcohol
(D) Tert. butyl alcohol
Option d – Tert. butyl alcohol
Which of the following is a cationic detergent?
(A) Sodium dodecylbenzene sulphonate
(B) Sodium lauryl sulfate
(C) Sodium stearate
(D) Cetyl trimethyl ammonium bromide
Option d – Cetyl trimethyl ammonium bromide
The material in a nanoscale has different properties in comparison with bulk materials. These properties include:
(A) Catalytic properties
(B) Magnetic properties
(C) Electrical properties
(D) All of these
Option d – All of these
Nanomaterial may be:
(A) Nanoparticles
(B) Nanowires
(C) Nanotubes
(D) All of these
Option d – All of these
A nanomaterial having all three dimensions on the nanoscale is called:
(A) Zero dimensional nanostructure
(B) One dimensional nanostructure
(C) Two dimensional nanostructure
(D) Three dimensional nanostructure
Option a – Zero dimensional nanostructure
For green chemistry, chemicals formed in the reaction of their degradation products should be:
(A) Non-toxic
(B) Bioaccumulative
(C) Environmentally persistent
(D) All of these
Option d – All of these
Green chemistry can help to:
(A) Protect the ozone layer
(B) Control greenhouse effect
(C) To save the environment
(D) All of these
Option d – All of these
Nanotechnology is used in:
(A) DVD
(B) CD players
(C) Computers
(D) All of these
Option d – All of these
The prefix nano comes from:
(A) Greek word meaning ‘dwarf’
(B) A French word meaning ‘billion’
(C) Spanish word meaning ‘particle’
(D) Latin word meaning ‘invisible’
Option a – Greek word meaning ‘dwarf’
Correct the statement about nanomaterial:
(A) Have a large surface area
(B) Have the same volume as that of macro size
(C) Have more chemical reactivity due to more surface area
(D) All of these
Option d – All of these
Catalytic activity in nanomaterial is more due to:
(A) Increase in surface area
(B) Decrease in volume
(C) Same particle size
(D) All of these
Option a – Increase in surface area
Nanogold is used as a catalyst in:
(A) Organic reactions
(B) Photocatalysis
(C) Polymerization
(D) Metal extraction
Option a – Organic reactions
The melting point of the material in nanosize will ………
(A) Decrease
(B) Increase
(C) Remain the same
(D) Cannot predict
Option a – Decrease
One-dimensional nanostructures have ………. dimensions in the nanoscale:
(A) 1
(B) 2
(C) 3
(D) 4
Option b – 2
An example of a two-dimensional nanostructure is:
(A) Nanoparticles
(B) Nanorods
(C) Thin films
(D) Nanorings
Option c – Thin films
Material having all three dimensions less than 100 nm is:
(A) Nanoparticles
(B) Quantum dots
(C) Nanoscales
(D) All of these
Option d – All of these
Material having two dimensions in nanoscale:
(A) Nanotubes
(B) Fibres
(C) Nanowires
(D) All of these
Option d – All of these
Materials having only one dimension in the nanoscale are:
(A) Thin films
(B) Layers
(C) Coating
(D) All
Option d – All
The color of gold in the nanoscale is:
(A) Yellow
(B) Red
(C) Blue
(D) Black
Option b – Red
X-ray diffractometer is used to detect:
(A) Preliminary confirmation of formation of nanoparticles.
(B) Particle size, crystal structure, and geometry.
(C) Morphology
(D) Binding nature
Option b – Particle size, crystal structure, and geometry
TEM is used to detect:
(A) Morphology
(B) Particle size
(C) Crystal structure
(D) Geometry
Option b – Particle size
FTIR is used to detect:
(A) Absorption of functional group and binding nature.
(B) Particle size
(C) Geometry
(D) Morphology
Option a – Absorption of functional group and binding nature
Nanoparticles can contribute to stronger, lighter, cleaner, and smart surfaces and they are used in the manufacturing of:
(A) Scratchproof eyeglass
(B) Sunscreens
(C) Crack-resistant paints
(D) All of these
Option d – All of these
Nanotechnology is used in:
(A) MRAM
(B) Electronic devices
(C) Water cleaning
(D) All of these
Option d – All of these
Example of self-cleaning material is:
(A) Lotus plant
(B) Mango plant
(C) Hybrid plants
(D) None of these
Option a – Lotus plant
Nanotechnology is commonly used in:
(A) Electronics and computers
(B) Make solar power more economic
(C) Manufacturing of smart drugs
(D) All of these
Option d – All of these
Disadvantages of nanotechnology are:
(A) Increase in air pollution
(B) Cause lung diseases
(C) Affects respiratory tract of humans due to small particle size
(D) All of these
Option d – All of these
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