Category: NEET Chemistry Objective Questions

300+ TOP MCQs on Oxidation Number and Oxidation State and Answers

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MCQs on Oxidation Number and Oxidation State :

1. Number of moles of K2Cr2O7 reduced by 1 mole of Sn2+ is
(A) 1/6
(B) 1/3
(C) 2/3
(D) 1

Answer

Answer: (b)

2. The oxidation number of carbon in CH2Cl2 is
(A) 0
(B) 2
(C) 3
(D) 5

Answer

Answer: (a)

3. Which of the following will not be oxidised by O3?
(A) KI
(B) FeSO4
(C) KMnO4
(D) K2MnO4

Answer

Answer: (c)

4. The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is
(A) +4
(B) +6
(C) +2
(D) +3

Answer

Answer: (d)

5. What products are expected from the disproportionation reaction of hypochlorous acid?
(A) HCl and Cl2O
(B) HCl and HClO3
(C) HClO3 and Cl2O
(D) HClO2 and HClO4

Answer

Answer: (b)

6. Which of the following elements does not show disproportionation tendency?
(A) Cl
(B) Br
(C) F
(D) I

Answer

Answer: (c)

7. What is the oxidation number of chlorine in HClO4?
(A) +3
(B) +5
(C) +7
(D) +8

Answer

Answer: (c)

8. The oxidation state of each Cl in CaOCl2 is
(A) 0
(B) +1
(C) -1
(D) +1, -1

Answer

Answer: (d)

9. The products formed when an aqueous solution of NaBr is electrolysed in a cell having inert electrodes are
(A) Na and Br2
(B) Na and O2
(C) H2, Br2, NaOH
(D) H2 and O2

Answer

Answer: (c)

10. Number of moles of MnO4– required to oxidise one mole of ferrous oxalate completely in the acidic medium will be
(A) 7.5 moles
(B) 0.2 moles
(C) 0.6 moles
(D) 0.4 moles

Answer

Answer: (c)

300+ TOP MCQs on Solutions Chemistry and Answers

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MCQs on Solutions Chemistry :

1. The mole fraction of the solute in one molal aqueous solution is
(A) 0.009
(B) 0.018
(C) 0.027
(D) 0.036

Answer

Answer: (b)

2. 5 cm3 of acetone is added to 100 cm3 of water, the vapour pressure of water over the solution will be
(A) equal to the vapour pressure of pure water.
(B) less than the vapour pressure of pure water.
(C) greater than the vapour pressure of pure water.
(D) very large.

Answer

Answer: (b)

3. The density of a solution prepared by dissolving 129g of urea in 1000g of water is 1.15g/ml. The molarity of this solution is
(A) 1.78M
(B) 1.02M
(C) 2.05M
(D) 0.50M

Answer

Answer: (c)

4. If at a certain temperature the vapour pressure of pure water is 25 mm Hg and that of a very dilute aqueous urea solution is 24.5 mm Hg, the molality of the solution is:
(A) 0.02
(B) 1.2
(C) 1.11
(D) 0.08

Answer

Answer: (c)

5. The relationship between osmotic pressure at 273K when 10g glucose (P1), 10g urea (P2) and 10g sucrose (P3) are dissolved in 250ml of water is
(A) P1 > P2 > P3
(B) P3 > P1 > P2
(C) P2 > P1 > P3
(D) P2 > P3 > P1

Answer

Answer: (c)

6. Two liquids X and Y form an ideal solution. At 300K vapour pressure of the solution containing 1mol of X and 3 mol of Y is 550 mm Hg. At the same temperature, if 1 mol of Y is further added to this solution, the vapour pressure of the solution increases by 10 mm Hg. Vapour pressure of X and Y in the pure states will be respectively
(A) 300 and 400
(B) 400 and 600
(C) 500 and 600
(D) 200 and 300

Answer

Answer: (b)

7. Mixing up equal volumes of 0.1M NaOH and 0.1M CH3COOH yields a solution which is
(A) basic
(B) acidic
(C) neutral
(D) None

Answer

Answer: (a)

8. Equal volumes of 0.1M AgNO3 and 0.2M NaCl are mixed. The concentration of NO3– ions in the mixture will be
(A) 0.1M
(B) 0.05M
(C) 0.2M
(D) 0.15M

Answer

Answer: (b)

9. Which of the following should be done in order to prepare 0.4M NaCl starting with 100ml of 0.3M NaCl?
(A) add 5.85g of NaCl
(B) and 20ml water
(C) add 0.01 mol NaCl
(D) evaporate 10ml of water

Answer

Answer: (c)

10. The volume of 0.025M H3PO4 required to neutralise 25ml of 0.03M Ca(OH)2 is
(A) 20ml
(B) 25ml
(C) 40ml
(D) 50ml

Answer

Answer: (a)

300+ TOP MCQs on Conductor and Conductance and Answers

NEET  Chemistry is the very imporatant paper in the Medical Entrance EXAM. So these NEET Chemistry MCQs with Answers for all Concepts as per the new syllabus. Practice daily with these NEET Chemistry objective questions on air pollution. NEET Chemistry Conductor and Conductance Multiple Choice Questions

MCQs on Conductor and Conductance :

1. The unit of conductance cannot be expressed in
(A) mho
(B) (ohm)-1
(C) siemen
(D) ohm/m

Answer

Answer: (b)

2. The SI unit of specific resistance is
(A) onm m
(B) ohm/m
(C) ohm/m2
(D) (ohm)-1

Answer

Answer: (a)

3. The reciprocal of resistivity of a conductor is
(A) conductance
(B) capacitance
(C) conductivity
(D) none of these

Answer

Answer: (c)

4. In order to measure current in a resistance present in a circuit the ammeter is connected
(A) in series
(B) in parallel
(C) in series or parallel
(D) nothing can be decided

Answer

Answer: (a)

5. Good conductors have many loosely bound
(A) atoms
(B) protons
(C) molecules
(D) electrons

Answer

Answer: (d)

6. The reciprocal of electrical resistance is
(A) voltage
(B) current
(C) conductance
(D) none of the above

Answer

Answer: (c)

7. The element with highest conductivity is
(A) gold
(B) silver
(C) copper
(D) platinum

Answer

Answer: (b)

8. As temperature increases electrolytic conduction
(A) increases
(B) decreases
(C) remains unaffected
(D) none of the above

Answer

Answer: (a)

9. The resistance of a conductor varies inversely as
(A) length
(B) area of cross section
(C) temperature
(D) Resistivity

Answer

Answer: (b)

10. With rise in temperature the resistance of semiconductors
(A) decreases
(B) increases
(C) first increase and then decrease
(D) remains constant

Answer

Answer: (a)

300+ TOP MCQs on Hydrogen and Answers

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MCQs on Hydrogen :

1. Electrolysis of brine produces
(A) chlorine gas
(B) hydrogen gas
(C) sodium hydroxide
(D) all the above

Answer

Answer: (d)

2. A reactant containing the element that is oxidised is called
(A) reducing agent
(B) oxidising agent
(C) hydrogen
(D) sublime

Answer

Answer: (a)

3. By losing one or two electrons the atoms of metal are
(A) oxidised
(B) reduced
(C) hydrogenated
(D) sublimated

Answer

Answer: (a)

4. Electrolytes conduct electricity in
(A) solid state
(B) liquid state
(C) gaseous state
(D) plasma state

Answer

Answer: (b)

5. Loss of hydrogen atoms by an element is called
(A) hydrogenation
(B) oxidation
(C) reduction
(D) sublimation

Answer

Answer: (b)

6. The electrolyte among the following is
(A) NaOH
(B) Urea
(C) glucose
(D) benzene

Answer

Answer: (a)

7. O-O-H bond angle in H2O2 is
(A) 97°
(B) 106°
(C) 120°
(D) 109°28′

Answer

Answer: (a)

8. Which of the following is very high for proton?
(A) radius
(B) ionization potential
(C) charge
(D) hydration energy

Answer

Answer: (d)

9. The list which contains only elements is
(A) air, water, oxygen
(B) hydrogen, oxygen, brass
(C) air, water, fire, earth
(D) calcium, sulphur, carbon

Answer

Answer: (d)

10. The smallest part of an element that cannot exist as a free state is
(A) ion
(B) charge
(C) atom
(D) molecule

Answer

Answer: (c)

300+ TOP MCQs on Oxidation Reduction and Answers

NEET  Chemistry is the very imporatant paper in the Medical Entrance EXAM. So these NEET Chemistry MCQs with Answers for all Concepts as per the new syllabus. Practice daily with these NEET Chemistry objective questions on air pollution. NEET Chemistry Oxidation Reduction Multiple Choice Questions

MCQs on Oxidation Reduction :

1. The total of the oxidation number in an element is
(A) charge
(B) volatility
(C) reduction
(D) oxidation

Answer

Answer: (a)

2. The reduction is a gain of
(A) electrons
(B) protons
(C) neutros
(D) oxygen

Answer

Answer: (a)

3. Which of the following is not a reducing agent?
(A) CO2
(B) SO2
(C) NO2
(D) ClO2

Answer

Answer: (a)

4. A number which is assigned to each atom or ion in a compound which explains its degree of oxidation is called
(A) oxidation state only
(B) oxidation number
(C) oxidation degree only
(D) oxidation state and number

Answer

Answer: (d)

5. The gain of oxygen is known as
(A) oxidation
(B) reduction
(C) halogenation
(D) chlorination

Answer

Answer: (a)

6. Which of the following undergoes a maximum change in its oxidation number, when a mixture of oxalic acid, potassium chlorate and sulphuric acid is heated?
(A) S
(B) Cl
(C) H
(D) C

Answer

Answer: (b)

7. The oxidation number for oxygen will always be
(A) 2
(B) -2
(C) 1
(D) -1

Answer

Answer: (b)

8. The reduction is the decrease in
(A) oxidation number
(B) charge
(C) solubility
(D) none of the above

Answer

Answer: (a)

9. The reaction in which oxidation and reduction takes place at the same time is called
(A) redox reaction
(B) oxidation reaction
(C) reduction reaction
(D) none of the above

Answer

Answer: (a)

10. Hydrogen (H2) is used for making
(A) margarine only
(B) ammonia only
(C) salts
(D) margarine and ammonia

Answer

Answer: (d)

300+ TOP MCQs on Electrochemistry and Answers

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MCQs on Electrochemistry :

1. The aqueous solution of which of the following compounds is the best conductor of electric current?
(A) Acetic acid,
(B) Hydrochloric acid
(C) Ammonia
(D) Fructose

Answer

Answer: (b)

2. An increase in the conductivity equivalent of a solid electrolyte with dilution is primarily due to
(A) increased ionic mobility of ions
(B) 100 percent electrolyte ionisation with natural dilution
(C) increase in both ion numbers and ionic mobility
(D) A rise in ion counts

Answer

Answer: (a)

3. The ionic conductance of Ba2+ and Cl– are respectively 127 and 76 ohm-1 at infinite dilution. The equivalent conductance of BaCl2 at infinite dilution will be
(A) 139.5
(B) 203
(C) 279
(D) 101.5

Answer

Answer: (a)

4. When heating one end of a metal plate, the other end gets hot because of
(A) the resistance of the metal
(B) mobility of atoms in the metal
(C) energised electrons moving to the other end
(D) minor perturbation in the energy of atoms.

Answer

Answer: (c)

5. The weight of silver displaced by a quantity of electricity which displaces 5600ml of O2 at STP will be
(A) 5.4g
(B) 10.8g
(C) 54.9g
(D) 108.0g

Answer

Answer: (d)

6. Once a current of 1.0 ampere was passed through one litre of CuCl2 solution for 16 min and 5 sec, all of the solution’s copper was deposited at the cathode. The power of solution CuCl2 was (Molar mass of Cu = 63.5; Faraday constant = 96,500 C/mol)
(A) 0.01N
(B) 0.01M
(C) 0.02M
(D) 0.2N

Answer

Answer: (a)

7. On electrolysis of dilute sulphuric acid using platinum electrodes, the product obtained at the anode will be
(A) hydrogen
(B) oxygen
(C) hydrogen sulphide
(D) sulphur dioxide

Answer

Answer: (b)

8. A device that converts the energy of combustion of fields like hydrogen and methane directly into electrical energy is known as
(A) Electrolytic cell
(B) Dynamo
(C) Ni-Cd cell
(D) Fuel cell

Answer

Answer: (d)

9. Which reaction is not feasible?
(A) 2KO + Br2 → 2KBr + I2
(B) 2KBr + I2 → 2KI + Br2
(C) 2KBr + Cl2 → 2KCl + Br2
(D) 2H2O + 2F2 → 4HF + O2

Answer

Answer: (b)

10. Without losing its concentration ZnCl2 solution cannot be kept in contact with
(A) Au
(B) Al
(C) Pb
(D) Ag

Answer

Answer: (b)