Category: NEET Chemistry Objective Questions

300+ TOP MCQs on General principles and Processes of Isolation of Elements and Answers

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MCQs on General principles and Processes of Isolation of Elements :

1. In the equation,
4M + 8CN– + H2O + O2 → 4[M(CN)2]– + 4OH–, the metal M is
(A) copper
(B) iron
(C) gold
(D) Zinc

Answer

Answer: (c)

2. Heating ore with carbon in the absence of air is known as:
(A) reduction
(B) carbon-reduction
(C) smelting
(D) Roasting

Answer

Answer: (c)

3. In the extraction of copper from sulphide ore, the metal is formed by reduction of Cu2O with
(A) FeS
(B) CO
(C) Cu2S
(D) SO2

Answer

Answer: (c)

4. The method of zone refining of metals is based upon the principle of
(A) greater solubility of the impurity in molten state than in solid
(B) greater mobility of pure metal than impurity
(C) higher melting point of impurity than that of pure metal.
(D) greater noble character of solid metal than that of the impurity

Answer

Answer: (a)

5. Cassiterite is the ore of which metal?
(A) Mn
(B) Sb
(C) Sn
(D) Ni

Answer

Answer: (c)

6. In electrorefining of copper some gold is produced as:
(A) cathode mud
(B) anode mud
(C) cathode deposit
(D) anode deposit

Answer

Answer: (b)

7. In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to:
(A) lower the melting point of bauxite
(B) dissolve bauxite and render it a conductor of electricity
(C) protect aluminium produced from oxygen
(D) minimise the heat loss due to radiation

Answer

Answer: (b)

8. The purest form of iron is:
(A) cast iron
(B) pig iron
(C) wrought iron
(D) steel

Answer

Answer: (c)

9. During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’. These are:
(A) Pb and Zn
(B) Sn and Ag
(C) Fe and Ni
(D) Ag and Au

Answer

Answer: (d)

10. Extraction of zinc from zinc blende is achieved by
(A) electrolytic reduction
(B) roasting followed by reduction with carbon
(C) roasting followed by reduction with another metal
(D) roasting followed by self-reduction

Answer

Answer: (b)

300+ TOP MCQs on Periodic Classification of Elements and Answers

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MCQs on Periodic Classification of Elements :

1. Find the successive elements of the periodic table with ionisation energies, 2372, 520 and 890 kJ per mol respectively
(A) Li, Be, B
(B) H, He, Li
(C) B, C, N
(D) He, Li, Be

Answer

Answer: (d)

2. In the modern periodic table, the number of period of the element is the same as
(A) principal quantum number
(B) atomic number
(C) azimuthal quantum number
(D) atomic mass

Answer

Answer: (a)

3. The correct order for the size of I, I+, I– is
(A) I > I– > I+
(B) I > I+ > I–
(C) I– > I > I+
(D) I+ > I– > I

Answer

Answer: (c)

4. For the same value of n, the penetration power of orbital follows the order
(A) s = p = d = f
(B) p > s > d > f
(C) f < d < p < s
(D) s < p < d < f

Answer

Answer: (c)

5. Which of the reactions will need the maximum amount of energy?
(A) Na → Na+ + e–
(B) Ca+ → Ca++ + e–
(C) K+ → K+ ++ e–
(D) C2+ → C3+ + e–

Answer

Answer: (c)

6. Which of the following statements is incorrect?
(A) I.E.1 of O is lower than that of N but I.E.2 O is higher than that of N
(B) The enthalpy of N to gain an electron is almost zero but of P is 74.3 kJ mol-1
(C) isoelectronic ions belong to the same period
(D) The covalent radius of iodine is less than its Van der Waal’s radius

Answer

Answer: (c)

7. The correct order of electronegativity is
(A) Cl > F > O > Br
(B) F > O > Cl > Br
(C) F > Cl > Br > O
(D) O > F > Cl > Br

Answer

Answer: (b)

8. Two different beakers contain M1-O-H, and M2-O-H solutions separately. Find the nature of the two solutions if the electronegativity of M1 = 3.4, M2 = 1.2, O = 3.5, H = 2.1
(A) acidic, acidic
(B) basic, acidic
(C) basic, basic
(D) acidic, basic

Answer

Answer: (d)

9. Which one is the most acidic among these?
(A) MgO
(B) CaO
(C) Al2O3
(D) Na2O

Answer

Answer: (c)

10. Which one will have the highest 2nd ionisation energy?
(A) 1s2 2s2 2p6 3s1
(B) 1s2 2s2 2p4
(C) 1s2 2s2 2p6
(D) 1s2 2s2 2p6 3s2

Answer

Answer: (a)

300+ TOP MCQs on Kp And Kc Relationship And Characteristics Of K and Answers

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MCQs on Kp And Kc Relationship And Characteristics Of K :

1. What will be the value of Kp if the Kc is 26 for a reaction, PCl5 ⇌ PCl3 + Cl2 at 250°?
(A) 0.57
(B) 0.46
(C) 0.83
(D) 0.61

Answer

Answer: (d)

2. For which of the following reactions Kp is less than Kc?
(A) 2HI ⇌ H2 + I2
(B) N2 + O2 ⇌ 2NO
(C) N2O4 ⇌ 2NO2
(D) 2SO2 + O2 ⇌ 2SO3

Answer

Answer: (d)

3. Two moles of PCl5 were heated to 400oC in 2 litres closed vessel. At equilibrium, 40% of PCl5 was dissociated into PCl3 and Cl2. Its Kc will be
(A) 3.75 mol/L
(B) 0.533 mol/L
(C) 0.267 mol/L
(D) None of the above

Answer

Answer: (c)

4. Which of the following is not correct?
(A) large value of K indicates large amount of products
(B) small value of K indicates large amount of reactants
(C) for K < 1 amount of reactants > amount of products
(D) none of the above

Answer

Answer: (d)

5. When Q (concentration quotient) is smaller than equilibrium constant
(A) reaction will be in equilibrium
(B) reaction will proceed in forward direction
(C) reaction will proceed in backward direction
(D) none of the above

Answer

Answer: (b)

6. If Kp and Kc are in equilibrium constants in terms of partial pressure and concentration
(A) Kp = Kc/RT
(B) Kp = KcRT
(C) Kp = Kc/(RT)𐤃n
(D) Kp = Kc(RT)𐤃n

Answer

Answer: (d)

7. For a reaction in equilibrium
(A) Q (concentration quotient) = K (equilibrium constant)
(B) Q > K
(C) Q < K
(D) none of the above

Answer

Answer: (a)

8. Active mass in the law of mass action is
(A) molar concentration
(B) absolute concentration
(C) concentration at 0°C
(D) molar mass

Answer

Answer: (a)

9. The mass of a gas dissolved in a given mass of a solvent at any temperature is directly proportional to
(A) pressure of gas
(B) volume of gas
(C) density of gas
(D) none of above

Answer

Answer: (a)

10. Which of the following is an example of solid-solution equilibrium?
(A) dissolution of sugar in water
(B) melting of ice
(C) evaporation of water in a closed vessel
(D) none of the above

Answer

Answer: (a)

300+ TOP MCQs on Dipole Moment and Answers

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MCQs on Dipole Moment :

1. Molecules with odd electron bond are
(A) paramagnetic
(B) unstable
(C) forms dimers at low temperature
(D) all are correct

Answer

Answer: (d)

2. In a crystal, atoms are located at the positions of
(A) maximum potential energy
(B) minimum potential energy
(C) zero potential energy
(D) indefinite potential energy

Answer

Answer: (b)

3. If the water molecule is linear
(A) it would have a very high boiling point
(B) it would be highly reactive
(C) its dipole moment would be zero
(D) it would be highly ionic

Answer

Answer: (c)

4. The percentage of ionic character of the bond between two atoms is calculated from the difference between their
(A) ionic radii
(B) electronegativities
(C) electron affinities
(D) ionisation energies

Answer

Answer: (b)

5. Which of the following is not correct for dipole moment?
(A) lone pair of electrons present on the central atom can give rise to the dipole moment
(B) the dipole moment is a vector quantity
(C) CO2 molecule has no dipole moment since C-O bonds are nonpolar
(D) the difference in electronegativities of combining atoms can lead to the dipole moment

Answer

Answer: (c)

6. For two ionic solids CaO and KI, identify the wrong statement among the following
(A) the lattice energy of CaO is much larger than KI
(B) KI is soluble in benzene
(C) CaO has a higher melting point
(D) KI has a lower melting point

Answer

Answer: (b)

7. A diatomic molecule has a dipole moment of 1.2D. If its bond distance is 1.0Ao, what fraction of electric charge “e” exists on each atom?
(A) 12% of e
(B) 18% of e
(C) 25% of e
(D) 30% of e

Answer

Answer: (c)

8. Find the species with a maximum dipole among the following
(A) NF3
(B) CO2
(C) NH3
(D) CH4

Answer

Answer: (c)

9. In conductors, opposite charges are separated by
(A) dielectric
(B) insulator
(C) microscopic distances
(D) large distances

Answer

Answer: (b)

10. Electric susceptibility is inversely proportional to
(A) permittivity
(B) polarization vector
(C) magnetic field intensity
(D) permeability

Answer

Answer: (a)

300+ TOP MCQs on D and F Block Elements and Answers

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MCQs on D and F Block Elements :

1. The number of unpaired electrons in gaseous species of Mn3+, Cr3+ and V3+ respectively are:
(A) 4, 4 and 2
(B) 3, 3 and 2
(C) 4, 3 and 2
(D) 3, 3 and 3

Answer

Answer: (c)

2. Gun metal is an alloy of:
(A) Cu and Al
(B) Cu and Sn
(C) Cu, Zn and Sn
(D) Cu, Zn and Ni

Answer

Answer: (c)

3. Which one of the following elements shows the maximum number of different oxidation states in its compounds?
(A) Eu
(B) La
(C) Cd
(D) Am

Answer

Answer: (d)

4. When potassium ferrocyanide crystals are heated with concentrated sulphuric acid, the gas evolved is
(A) sulphur dioxide
(B) ammonia
(C) carbon monoxide
(D) carbon dioxide

Answer

Answer: (c)

5. Zinc and mercury do not show variable valency like d-block elements because
(A) they are soft
(B) their d-shells are complete
(C) they have only two electrons in the outermost subshell.
(D) their d-shells are incomplete

Answer

Answer: (b)

6. Which of the following products are obtained when Na2CO3 is added to a solution of copper sulphate?
(A) Basic copper carbonate , sodium sulphate and CO2
(B) Copper hydroxide, sodium sulphate and CO2
(C) Copper carbonate, sodium sulphate and CO2
(D) Copper carbonate and sodium sulphate

Answer

Answer: (d)

7. The pair that has similar atomic radii is
(A) Mn and Re
(B) Ti and Hf
(C) Sc and Ni
(D) Mo and W

Answer

Answer: (d)

8. Silver nitrate produces a black stain on the skin due to
(A) being a strong reducing agent
(B) its corrosive action
(C) formation of complex compound
(D) its reduction to metallic silver

Answer

Answer: (d)

9. According to IUPAC nomenclature sodium nitroprusside dihydrate is named as
(A) Sodium pentacyanonitrosylferrate (III)
(B) Sodium nitroferrocyanide
(C) Sodium nitroferricyanide
(D) Sodium pentacyanonitrosylferrate (II)

Answer

Answer: (a)

10. In Fe(CO)5, the Fe-C bond possesses:
(A) ionic character
(B) sigma character only
(C) pi character
(D) both sigma and pi characters

Answer

Answer: (d)

300+ TOP MCQs on s-Block Elements and Answers

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MCQs on s-Block Elements :

1. Which of the compounds is known as Slaked lime?
(A) CaO
(B) CaSO4
(C) Ca(OH)2
(D) CaCO3

Answer

Answer: (c)

2. Which of the ions have maximum hydration energy?
(A) Sr2+
(B) Ca2+
(C) Mg2+
(D) Be2+

Answer

Answer: (d)

3. As compared to K, Na has
(A) higher ionization potential
(B) lower melting point
(C) lower electronegativity
(D) larger atomic radius

Answer

Answer: (a)

4. Which one is the most stable carbonate?
(A) BaCO3
(B) MgCO3
(C) CaCO3
(D) BeCO3

Answer

Answer: (a)

5. Plaster of Paris (POP) is
(A) CaSO4 H2O
(B) CaSO4 2H2O
(C) CaSO4
(D) CaSO4 1/2H2O

Answer

Answer: (d)

6. Which oxide is amphoteric?
(A) BaO
(B) CaO
(C) BeO
(D) MgO

Answer

Answer: (c)

7. Be shows the diagonal relationship with
(A) Na
(B) Al
(C) Mg
(D) B

Answer

Answer: (b)

8. The tendency to lose their valance electron easily by alkali metals makes them
(A) strong reducing agent
(B) weak reducing agent
(C) strong oxidising agent
(D) weak oxidising agent

Answer

Answer: (a)

9. Which one is known as a fusion mixture?
(A) Na2CO3 + NaHCO3
(B) Na2CO3 + NaOH
(C) Na2CO3 + K2SO4
(D) Na2CO3 + K2CO3

Answer

Answer: (d)

10. Find the incorrect trend for alkaline earth metals
(A) atomic size Be < Mg < Ca < Sr
(B) second ionization energy Be < Mg < Ca < Sr
(C) Hydration enthalpy Sr < Ca < Mg < Be
(D) Density Ca < Mg < Be < Sr

Answer

Answer: (b)