Q- Which of the compounds can exist together?
(a) HgCl2, SnCl2
(b) FeCl3, KI
(c) FeCl3, SnCl2
(d) FeCl2, SnCl2
Answer: (d)
Q- One mole of ferrous oxalate requires____ moles of MnO4– to get oxidised completely in an acidic medium
(a) 0.6 moles
(b) 0.4 moles
(c) 0.2 moles
(d) 7.5 moles
Answer: (b)
Q- H2O2 changes Cr2O72- ion to CrO5 in an acidic medium, the oxidation state of Cr in CrO5 is
(a) +6
(b) +5
(c) -10
(d) +3
Answer: (a)
Q- H2SO4 acts as a strong oxidising agent. In which of the reaction, is it not acting as an oxidising agent?
(a) C + 2H2SO4 → CO2 + 2SO2 + 2H2O
(b) CaF2 + 2H2SO4 → CaSO4 + 2HF
(c) S + 2H2SO4 → 3SO2 + H2O
(d) Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O
Answer: (b)
Q- During a reaction of oxalic acid, potassium chlorate and sulphuric acid, the oxidation number of which of the element undergoes a maximum change
(a) H
(b) S
(c) C
(d) Cl
Answer: (d)
Q- Find the redox reaction
(a) In the atmosphere, O3 from O2 by lighting
(b) The reaction of H2SO4 with NaOH
(c) Both oxidation and reduction reaction
(d) Evaporation of water
Answer: (c)
Q- Find the oxidation state of I in H4IO6–
(a) +7
(b) +5
(c) +1
(d) -1
Answer: (a)
Q- In which of the following complex, the oxidation number of Fe is +1?
(a) Fe4[Fe(CN)6]3
(b) [Fe(H2O)5NO]SO4
(c) [FeBr4]–
(d) [Fe(H2O)6]2-
Answer: (b)
Q-Which among the following compounds is the most reducing compound?
(a) H2S
(b) HNO2
(c) SnCl2
(d) H2SO3
Answer: (a)
Q- Which among the following is the strongest oxidising agent?
(a) H2O2
(b) O3
(c) K2Cr2O7
(d) KMnO4
Answer: (b)
Q- Find the pH of a solution when 0.01 M HCl and 0.1 M NaOH are mixed in equal volumes
(a) 12.65
(b) 1.04
(c) 7.0
(d) 2.0
Answer: (a)
Q- Which of the following aqueous solution will be the best conductor of electricity?
(a) NH3
(b) CH3COOH
(c) HCl
(d) C6H12O6
Answer: (c)
Q- In 0.10 M aqueous solution of pyridine (C5H5N), find the percentage of pyridine that forms pyridinium ion (C5H5N+H) (Kb for C5H5N = 1.7 x 10-9 )
(a) 1.6%
(b) 0.77%
(c) 0.0060%
(d) 0.013%
Answer: (d)
Q- Find the equilibrium constant of the reaction
If the equilibrium constant for the following reactions are given
(a) K2K3/K1
(b) K1K33/K2
(c) K2K33/K1
(d) K23K3/K1
Answer: (c)
Q- Highest pH will be recorded for which of the following solutions if they are equimolar
(a) AlCl3
(b) BaCl2
(c) BeCl2
(d) LiCl
Answer: (b)
Q-The equilibrium constant is 278 for the reaction
at the same temperature, what will be the equilibrium constant for the following reaction?
(a) 6 x 10-2
(b) 1.8 x 10-3
(c) 1.3 x 10-5
(d) 3.6 x 10-5
Answer: (a)
Q- What will be the pH of a buffer solution having an equal concentration of B– and HB (Kb = 10-10 for B–)
(a) 7
(b) 4
(c) 10
(d) 6
Answer: (b)
Q- Find the increase in equilibrium concentration of Fe3+ ions if OH– ions concentration decreases to 1/4th in the following reaction
(a) 8 times
(b) 16 times
(c) 4 times
(d) 64 times
Answer: (d)
Q- On increasing the concentration of reactants in a reversible reaction, then equilibrium constant will
(a) depend on the concentration
(b) increase
(c) unchanged
(d) decrease
Answer: (c)
Q- Find the conjugate acid of NH2–
(a) NH3
(b) NH4OH
(c) NH4+
(d) NH2–
Answer: (a)
Q- What will be the value of ΔH, if the forward and reverse reactions have the same energy of activation?
(a) ΔH = ΔG = ΔS = 0
(b) ΔS = 0
(c) ΔG = 0
(d) ΔH = 0
Answer: (d)
Q- What will be the entropy change (ΔS), when an ideal gas undergoes a change in the pressure from pi to pf isothermally?
(a)
(b)
(c)
(d)
Answer: (a)
Q- Find out the relationship between x, y and z considering below three reactions
(a) y = 2z – x
(b) x = y – z
(c) x = y + z
(d) z = x + y
Answer: (c)
Q- What is the molar entropy change for melting of ice at 0℃, if ΔHf = 1.435 kcal/mol?
(a) 0.526 cal/(mol K)
(b) 5.26 cal/(mol K)
(c) 10.52 cal/(mol K)
(d) 21.04 cal/(mol K)
Answer: (b)
Q-What is the function of a catalyst in a chemical reaction?
(a) decrease rate constant of reaction
(b) increases activation energy of reaction
(c) reduces enthalpy of reaction
(d) does not affect the equilibrium constant of reaction
Answer: (d)
Q-What will be the work done by 3 moles of an ideal gas when it expands spontaneously in a vacuum?
(a) zero
(b) infinite
(c) 3 joules
(d) 9 joules
Answer: (a)
Q- Find the temperature at which the below reaction will be in equilibrium if the enthalpy and entropy change for the reaction is 30 kJ mol-1 and 105 J K-1 mol-1 respectively
Br2(l) + Cl2(g) → 2BrCl(g)
(a) 273 K
(b) 300 K
(c) 450 K
(d) 285.7 K
Answer: (d)
Q- Which is true for the entropy of a spontaneous reaction?
(a) ΔS(system) – ΔS(surroundings) > 0
(b) ΔS(system) + ΔS(surroundings) > 0
(c) ΔS(surroundings) > 0 only
(d) ΔS(system) > 0 only
Answer: (b)
Q- An ideal gas is expanded isothermally at 300 K from 1 litre to 10 litres. Find the ΔE for this process (R = 2 cal mol-1 K-1)
(a) 9 L atm
(b) 1381.1 cal
(c) zero
(d) 163.7 cal
Answer: (c)
Q-ΔH for the reaction N2 + 3H2 ⇋ 2NH3
(a) ΔE – 2RT
(b) ΔE + 2RT
(c) ΔE – RT
(d) ΔH = RT
Answer: (a)
MCQ’S ON PERIODIC CLASSIFICATION OF ELEMENTS
Q- 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: (d)
Q- 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: (a)
Q-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: (c)
Q- 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: (c)
Q- 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: (c)
Q- 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: (c)
Q-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: (b)
Q-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: (d)
Q-Which one is the most acidic among these?
(a) MgO
(b) CaO
(c) Al2O3
(d) Na2O
Answer: (c)
Q-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: (a)
Q- Which of the compounds is known as Slaked lime?
(a) CaO
(b) CaSO4
(c) Ca(OH)2
(d) CaCO3
Answer: (c)
Q-Which of the ions have maximum hydration energy?
(a) Sr2+
(b) Ca2+
(c) Mg2+
(d) Be2+
Answer: (d)
Q- As compared to K, Na has
(a) higher ionization potential
(b) lower melting point
(c) lower electronegativity
(d) larger atomic radius
Answer: (a)
Q-Which one is the most stable carbonate?
(a) BaCO3
(b) MgCO3
(c) CaCO3
(d) BeCO3
Answer: (a)
Q- Plaster of Paris (POP) is
(a) CaSO4 H2O
(b) CaSO4 2H2O
(c) CaSO4
(d) CaSO4 1/2H2O
Answer: (d)
Q- Which oxide is amphoteric?
(a) BaO
(b) CaO
(c) BeO
(d) MgO
Answer: (c)
Q- Be shows the diagonal relationship with
(a) Na
(b) Al
(c) Mg
(d) B
Answer: (b)
Q- 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: (a)
Q- Which one is known as a fusion mixture?
(a) Na2CO3 + NaHCO3
(b) Na2CO3 + NaOH
(c) Na2CO3 + K2SO4
(d) Na2CO3 + K2CO3
Answer: (d)
Q- 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: (b)
Q- C-O bond length is minimum in
(a) CO2
(b) CO32-
(c) HCOO–
(d) CO
Answer: (d)
Q- Molecules are held together in a crystal by
(a) hydrogen bond
(b) electrostatic attraction
(c) Van der Waal’s attraction
(d) dipole-dipole attraction
Answer: (c)
Q- Sp3d2 hybridization is present in [Co(NH3)63+], find its geometry
(a) octahedral geometry
(b) square planar geometry
(c) tetragonal geometry
(d) tetrahedral geometry
Answer: (a)
Q- Find the molecule with the maximum dipole moment
(a) CH4
(b) NH3
(c) CO2
(d) NF3
Answer: (b)
Q- MX6 is a molecule with octahedral geometry. How many X – M – X bonds are at 180°?
(a) four
(b) two
(c) three
(d) six
Answer: (c)
Find the pair with sp2 hybridisation of the central molecule
(a) NH3 and NO2–
(b) BF3 and NH2–
(c) BF3 and NO2–
(d) NH2– and H2O
Answer: (c)
Q- The formal charge and P-O bond order in PO43- respectively are
(a) 0.6, -0.75
(b) -0.75, 1.25
(c) 1.0, -0.75
(d) 1.25, -3
Answer: (b)
Q- Which of the molecules does not have a permanent dipole moment?
(a) SO3
(b) SO2
(c) H2S
(d) CS2
Answer: (d)
Q- pℼ – dℼ bonding is present in which molecule
(a) SO32-
(b) CO32-
(c) NO3–
(d) BO33-
Answer: (a)
Q- Which one has a pyramidal shape?
(a) SO3
(b) PCl3
(c) CO32-
(d) NO3–
Answer: (b)
Q- How many orbitals can have the following set of quantum numbers, n = 3, l = 1, m1 = 0 ?
(a) 3
(b) 1
(c) 4
(d) 2
Answer: (b)
Q-Electronic configuration of the outer shell of the element Gd with atomic number 64 is
(a) 4f4 5d5 6s1
(b) 4f3 5d5 6s2
(c) 4f5 5d4 6s1
(d) 4f7 5d1 6s2
Answer: (d)
Q- Maximum number of electrons in a subshell can be
(a) 4l + 2
(b) 4l – 2
(c) 2n2
(d) 2l + 1
Answer: (a)
Q-The orientation of atomic orbitals depends on their
(a) spin quantum number
(b) magnetic quantum number
(c) azimuthal quantum number
(d) principal quantum number
Answer: (b)
Q- A gas X has Cp and Cv ratio as 1.4, at NTP 11.2 L of gas X will contain_______ number of atoms
(a) 1.2 × 1023
(b) 3.01 × 1023
(c) 2.01 × 1023
(d) 6.02 × 1023
Answer: (d)
Q- Number of unpaired electrons in N2+
(a) 3
(b) 1
(c) 2
(d) 0
Answer: (b)
Q- The excitation energy of a hydrogen atom from its ground state to its third excited state is
(a) 12.75 eV
(b) 0.85 eV
(c) 10.2 eV
(d) 12.1 eV
Answer: (a)
Q- 3p orbital has _____ radial nodes
(a) three
(b) two
(c) one
(d) none
Answer: (c)
Q- A 0.66 kg ball is moving with a speed of 100 m/s. Find its wavelength
(a) 6.6 × 10-34 m
(b) 6.6 × 10-32 m
(c) 1.0 × 10-32 m
(d) 1.0 × 10-35 m
Answer: (d)
Q- Elements X and Y combine to form two compounds XY and X2Y. Find the atomic weight of X and Y, if the weight of 0.1 moles of XY is 10g and 0.05 moles of X2Y is 9g
(a) 30, 20
(b) 80, 20
(c) 60, 40
(d) 20, 30
Answer: (b)
Q- Which one will have maximum numbers of water molecules?
(a) 18 molecules of water
(b) 1.8 grams of water
(c) 18 grams of water
(d) 18 moles of water
Answer: (d)
Q- The number of atoms present in 0.1 moles of a triatomic gas is
(a) 1.806 × 1023
(b) 1.806 × 1022
(c) 3.600 × 1023
(d) 6.026 × 1022
Answer: (a)
Q- Find the volume of O2 required to burn 1 L of propane completely, measured at 0℃ temperature and 1 atm pressure
(a) 10 L
(b) 7 L
(c) 6 L
(d) 5 L
Answer: (d)
Q-A gas X has Cp and Cv ratio as 1.4, at NTP 11.2 L of gas X will contain_______ number of atoms
(a) 1.2 × 1023
(b) 3.01 × 1023
(c) 2.01 × 1023
(d) 6.02 × 1023
Answer: (d)
Q- Which of the species is not paramagnetic?
(a) As+
(b) Cl–
(c) Ne2+
(d) Be+
Answer: (b)
Q- Pressure has the same dimension as ____________
(a) energy per unit volume
(b) energy
(c) force per unit volume
(d) force
Answer: (a)
Q- A container has an equal mass of H2, O2 and CH4 at 27℃, the ratio of their volume is
(a) 16:8:1
(b) 8:1:2
(c) 16:1:2
(d) 8:16:1
Answer: (c)
Q- There are two chlorides of sulphur S2Cl2 and SCl2. What is the equivalent mass of S in SCl2
(a) 64.8 g/mole
(b) 32 g/mole
(c) 16 g/mole
(d) 8 g/mole
Answer: (c)
Q-Boron exists as two stable isotopes; 10B(19%) and 11B(81%). Find out the average atomic weight of boron in the periodic table
(a) 10.0
(b) 11.2
(c) 10.2
(d) 10.8
Answer: (d)
Q- Find the correct order of increasing acidity
Q- Identify Z in the given reaction:
Q- The product obtained on heating 2-Bromopentane with potassium ethoxide in ethanol is
(a) 1-pentene
(b) 2-cis-pentene
(c) trans-2-pentene
(d) 2-ethoxy pentane
Answer: (c)
Q- Choose the process by which liquid hydrocarbons can be converted to gaseous hydrocarbons
(a) hydrolysis
(b) oxidation
(c) cracking
(d) distillation under reduced pressure
Answer: (c)
Q- Which one of the following halide can be used in the Friedel-Crafts reaction?
(a) Isopropyl chloride
(b) Bromobenzene
(c) Chlorobenzene
(d) Chloroethene
Answer: (a)
Q- Which one of the following compound forms salt on reaction with NaNH2?
(a) C2H2
(b) C2H6
(c) C6H6
(d) C2H4
Answer: (a)
Q- Which among the following reagent can be used to distinguish between CH2BrCH=CH2 from CH3CH=CHBr?
(a) Br2/CCl4
(b) cold KMnO4
(c) AgNO3/C2H5OH
(d) Ag(NH3)2OH
Answer: (c)
Q- Isopropyl iodide is formed after reaction of propene with HI, this is due to
(a) more stable free radical
(b) homolysis
(c) more stable carbanion
(d) more stable carbocation
Answer: (d)
Q- C6H5CHO is formed when C6H6 is treated with CO and HCl in the presence of anhydrous AlCl3. Name of the reaction is:
(a) Friedel crafts reaction
(b) Gattermann Koch reaction
(c) Rosenmund reaction
(d) Stephen reaction
Answer: (b)
Q- A compound having a bond angle 180° is
(a) alkyne
(b) alkane
(c) alkene
(d) cycloalkane
Answer: (a)
