SR STAR CO SC(MODEL-A&B)
SR STAR CO SC(MODEL-A&B) Date: 04.07.2024
Duration: 1 Hr Max. Marks: 200
CHEMISTRY NCERT TEST – 1
General Instructions:
Attempt all the questions, each correct answer carries +4 and wrong answer -1.
1. The electronic configuration of Cu(II) is 3d9 whereas that of Cu(I) is 3d10. Which of
the following is correct?
1) Cu(II) is more stable
2) Cu(II) is less stable
3) Cu(I) and Cu(II are equally stable
4) Cu(I) is more stable in aqueous state
2. Which of the following reactions are disproportionation reactions?
(a) Cu Cu 2 Cu
(b) 3MnO42 4H 2MnO4 MnO2 2 H 2O
(c) 2KMnO4 K 2 MnO4 MnO2 O2
(d) 2MnO4 3Mn 2 2 H 2O 5MnO2 4 H
1) a, b 2) a, b, c 3) b, c, d 4) a, d
3. When KMnO4 solution is added to oxalic acid solution, the decolourisation is slow in
the beginning but becomes instantaneous after some time because
1) CO 2 is formed as the product.
2) Reaction is exothermic.
3) MnO4 catalyses the reaction.
4) Mn2+ acts as autocatalyst.
4. There are 14 elements in actinoid series. Which of the following elements does not
belong to this series?
1) U 2) Np 3) Tm 4) Fm
SR STAR CO SC(MODEL-A&B)
5. Which of the following is amphoteric oxide?
Mn2 O7 , CrO3 , Cr2O3 , CrO, V2O5 , V2O4
1) V2O5 , Cr2O3 2) Mn2O7 , CrO3 3) CrO,V2O5 4) V2O5 ,V2O4
6. Gadolinium belongs to 4f series. It’s atomic number is 64. Which of the following is
the correct electronic configuration of gadolinium?
1) [ Xe]4 f 7 5d 1 6 s 2 2) [ Xe]4 f 6 5d 2 6 s 2 3) [ Xe]4 f 8 6d 2 4) [ Xe]4 f 9 5s1
7. Interstitial compounds are formed when small atoms are trapped inside the crystal
lattice of metals. Which of the following is not the characteristic property of interstitial
compounds?
1) They have high melting points in comparison to pure metals.
2) They are very hard.
3) They retain metallic conductivity.
4) They are chemically very reactive.
8. KMnO4 acts as an oxidising agent in alkaline medium. When alkaline KMnO4 is
treated with KI, iodide ion is oxidised to ____________.
1) I 2 2) IO 3) IO3 4) IO4
9. Which of the following statements is not correct?
1) Copper cannot liberates hydrogen from acids.
2) In its higher oxidation states, manganese forms stable compounds with oxygen
3) Mn3+ and Co3+ are oxidising agents in aqueous solution
4) Ti2+ and Cr2+ are reducing agents in aqueous solution
10. Why is HCl not used to make the medium acidic in oxidation reactions of KMnO4 in
acidic medium? 1) Both HCl and KMnO4 act as oxidising agents
2) KMnO4 oxidises HCl into Cl2 which is also an oxidising agent.
3) KMnO4 is a weaker oxidising agent than HCl
4) KMnO4 acts as a reducing agent in the presence of HCl.
11. In the form of dichromate, Cr (VI) is a strong oxidising agent in acidic medium but
Mo (VI) in MoO3 and W (VI) in WO3 are not because ___________.
(a) Cr (VI) is more stable than Mo(VI) and W(VI).
(b) Mo(VI) and W(VI) are more stable than Cr(VI).
(c) Higher oxidation states of heavier members of group-6 of transition series are more
stable.
SR STAR CO SC(MODEL-A&B)
(d) Lower oxidation states of heavier members of group-6 of transition series are more
stable.
Which of the following reasons are correct?
1) a & b 2) b & c 3) a, c & d 4) a & d
12. Which of the following are not transition elements?
(a) Cr (b) Hg (c) Cn (d) Y
1) a & b 2) a, b & c 3) b & c 4) b & d
13. Which of the following lanthanoids show +2 oxidation state besides the characteristic
oxidation state +3 of lanthanoids?
(a) Ce (b) Eu (c) Yb (d) Ho
1) a & b 2) a, b & c 3) b & c 4) b & d
14. Match the catalysts given in Column I with the processes given in Column II.
Column I (Catalyst) Column II (Process)
(i) Ni in the presence of hydrogen (a) Zieglar Natta catalyst
(ii) Cu2Cl2 (b) Contact process
(iii) V2O5 (c) Vegetable oil to ghee
(iv) Finely divided iron (d) Sandmeyer reaction
(v) TiCl4 Al CH 3 3 (e) Haber’s Process
(f) Decomposition of KClO3
1) (i)-(a), (ii)-(c), (iii)-(b), (iv)-(e), (v)-(d)
2) (i)-(a), (ii)-(f), (iii)-(b), (iv)-(e), (v)-(d)
3) (i)-(c), (ii)-(d), (iii)-(b), (iv)-(e), (v)-(a)
4) (i)-(a), (ii)-(c), (iii)-(b), (iv)-(d), (v)-(e)
15. Match the solutions given in Column I and the colours given in Column II.
Column I (Aqueous solution of salt) Column II (Colour)
(i) FeSO4 .7 H 2O (a) Green
(ii) NiCl2 .4 H 2O (b) Light Pink
(iii) MnCl2 .4 H 2O (c) Blue
(iv) CoCl2 .6 H 2 O (d) Pale green
(v) Cu2Cl2 (e) Pink
(d) Colourless
SR STAR CO SC(MODEL-A&B)
1) (i)-(a), (ii)-(c), (iii)-(b), (iv)-(e), (v)-(d)
2) (i)-(d), (ii)-(a), (iii)-(b), (iv)-(e), (v)-(c)
3) (i)-(b), (ii)-(a), (iii)-(c), (iv)-(e), (v)-(d)
4) (i)-(a), (ii)-(c), (iii)-(b), (iv)-(d), (v)-(e)
16. Assertion : Separation of Zr and Hf is difficult.
Reason : Because Zr and Hf lie in the same group of the periodic table.
1) Both assertion and reason are true, and reason is the correct explanation of the
assertion.
2) Both assertion and reason are true but reason is not the correct explanation of
assertion.
3) Assertion is not true but reason is true.
4) Both assertion and reason are false.
17. Assertion : Actinoids form relatively less stable complexes as compared to
lanthanoids.
Reason : Actinoids can utilise their 5f orbitals along with 6d orbitals in bonding but
lanthanoids do not use their 4f orbital for bonding.
1) Both assertion and reason are true, and reason is the correct explanation of the
assertion.
2) Both assertion and reason are true but reason is not the correct explanation of
assertion.
3) Assertion is not true but reason is true.
4) Both assertion and reason are false.
18. Which among the following has highest enthalpy of atomization?
1) Sc 2) Ti 3) Mn 4) V
19. Correct order of ionic radii of the given ions is
1) Er3+ > Nd 3+ > Gd3+ 2) Nd3+ > Er3+ > Gd3+
3) Gd3+ > Er3+ > Nd3+ 4) Nd3+ > Gd3+ > Er3+
20. Consider the following statements
(i) Copper does not liberate hydrogen on reaction with dilute H 2 SO4
(ii) Metallic radius of titanium is greater than vanadium
(iii) Ni(CO)4 is an organometallic compound
SR STAR CO SC(MODEL-A&B)
The correct statements are
1) (i) and (ii) only 2) (ii) and (iii) only
3) (i) and (iii) only 4) (i), (ii) and (iii)
21. Negative hydration enthalpy of which metal cation is highest?
1) Ni 2 2) Ti 2 3) Cr 2 4) V 2
22. Correct order of oxidising power of Cr2O72 , MnO4 ,VO2 is
1) VO2 Cr2O72 MnO4 2) MnO4 Cr2O72 VO2
3) Cr2O72 MnO4 VO2 4) MnO4 VO2 Cr2O72
23. Iron(III) catalyses the reaction between iodide and persulphate ions, in which
A. Fe3+ oxidises the iodide ion
B. Fe3+ oxidises the persulphate ion
C. Fe2+ reduces the iodide ion.
D. Fe2+ reduces the persulphate ion
Choose the most appropriate answer from the options given below:
1) B and C only 2) B only 3) A only 4) A and D only
24. Given below are two statements: one is labelled as Assertion-(A) and the other is
labelled as Reason (R).
Assertion: In aqueous solutions Cr2+ is reducing while Mn3+ is oxidising in nature.
Reason: Both Cr2+ and Mn3+ have five unpaired electrons.
1) (A)is true but (R) is false
2) Both (A) and (R) are true and (R) is the correct explanation of (A)
3) Both (A) and (R) are true but (R) is not the correct explanation of (A)
4) (A) is false but (R) is true.
25. The number of ions from the following that have the ability to liberate hydrogen from
a dilute acid is _______. Ti2+,Cr2+ and V2+.
1) 0 2) 2 3) 3 4) 1
26. Statement I: Fusion of MnO2 with KOH and an oxidizing agent gives dark green
K2MnO 4.
Statement II: Manganate ion on electrolytic oxidation in alkaline medium gives
permanganate ion.
SR STAR CO SC(MODEL-A&B)
1) Both Statement I is false but Statement II is true.
2) Both Statement I and Statement II is false.
3) Statement I is true but Statement II is false.
4) Statement I and Statement II is true.
27. Choose the correct statements from the following.
A. Mn2O7 is an oil at room temperature.
B. V2O 4 reacts with acid to give VO22
C. CrO is a basic oxide.
D. V2O 5 does not react with acid
Choose the correct answer from the options given below:
1) A, B and D only 2) A and C only
3) A, B and C only 4) B and C only
28. Large number of oxidation states are exhibited by the actinoids than those by the
lanthanoids, the main reason being
1) 4f orbitals more diffused than the 5f orbitals
2) less energy difference between 5f and 6d than between 4f and 5d orbitals
3) More energy difference between 5f and 6d than between 4f and 5d orbitals
4) More reactive nature of the actinoids than the lanthanoids.
29.
Column – I (oxide) Column – II (Nature of oxide)
A) V2O3 p) Acidic
B) CrO q) Basic
C) Cr2 O3 r) Amphoteric
D) Mn2 O7
1) A r; B q; C r ; D p 2) A q; B p; C r ; D q
3) A q; B q; C r ; D p 4) A p; B q; C r; D p
30. Based on E o 3 values, ion which liberates hydrogen gas on its reaction with
M /M 2
dilute acids its
1) Mn2 2) Fe2 3) Co 2 4) Ti 2
SR STAR CO SC(MODEL-A&B)
31. The metal not present in the alloy german silver is
1) Cu 2) Zn 3) Ni 4) Sn
32. Which of the following transition element has high density?
1) Iron 2) Zinc 3) Copper 4) Chromium
33. Select the correct graphical representation
1) 2)
3) 4)
34.
Column – I (Element) Column – II (Valance shell
electronic configuration)
A) Ag i) 4d 7 5s1
B) Rh ii) 4d 8 5s1
C) Pd iii) 4d 10 5s 0
D) Ru iv) 4d 10 5s1
1) A i; B iii; C ii; D iv 2) A iv; B ii; C iii; D i
3) A i; B ii; C iii; D iv 4) A iv; B iii; C ii; D i
H
35. MnO4 I Mn 2 X
OH
MnO4 I
fa int ly alkaline
MnO2 Y
X and Y are respectively
1) I 2 , IO3 2) IO3 , I 2 3) I 2 , IO4 4) IO3 , IO4
SR STAR CO SC(MODEL-A&B)
36. Match List – I with List – II and identify correct option.
List – I List – II
P) Colourless in aqueous solution i) Cu 2 , Fe3
Q) 5.9BM ii) Ti 3 , Cu 2
R) Coloured in aqueous solution iii) Fe3 , Mn2
S) 1.7BM iv) Zn 2 , Sc3
1) p iii; Q iv; R i; S ii 2) p iv; Q iii; R i; S ii
3) p ii; Q iii; R iv; S i 4) p i; Q ii; R iii; S iv
37. Assertion: The stability of Fe3 , Mn3 and Cr 3 in acidic medium is Mn3 Fe3 Cr 3 .
Reason: The SRP value Fe3 / Fe2 is higher than Cr 3 / Cr 2 and lower than
Mn3 / Mn2 .
1) (A)is true but (R) is false
2) Both (A) and (R) are true and (R) is the correct explanation of (A)
3) Both (A) and (R) are true but (R) is not the correct explanation of (A)
4) (A) is false but (R) is true
38. Assertion: Cobalt(II) is less stable in aqueous solution but in the presence of
complexating reagents it is easily oxidised.
Reason: In presence strong field complexating agents Co 2 to Co3 due to crystal
field stabilisation overcomes 3 rd ionisation energy.
1) (A)is true but (R) is false
2) Both (A) and (R) are true and (R) is the correct explanation of (A)
3) Both (A) and (R) are true but (R) is not the correct explanation of (A)
4) (A) is false but (R) is true
39. The first and second ionization energies Lanthanoids comparable with _________.
1) Al 2) Tl 3) Mg 4) Ca
40. The steel hard lanthanoid metal is
1) Sm 2) Ce 3) Gd 4) Eu
SR STAR CO SC(MODEL-A&B)
41. Which of the following orders are correct?
1) Metallic radius: Sc > Ti > V > Cr
2) Melting point: Ce > Sm
3) Stability: Ce 4 Ce3
4) Atomic radius: Hf Zr Ti
42. 2 MnO2 4 KOH O2 A H 2 O
A H B C H 2O
If ‘C’ is an oxide, which of the following statements are correct?
1) Colour of ‘A’ is purple.
2) Colour of ‘B’ is due to d – d transition.
3) Colour of ‘B’ is green
4) ‘B’ is isostructural with KClO4 .
43. Which of the following pair of ions have observed magnetic moment is greater than
calculated magnetic moment?
1) Cr 2 , Fe2 2) Co 2 , Cu 2 3) Ti 2 , V 2 4) Sc 2 , Zn 2
44. The lowest oxidation state exhibited by transition elements in their compounds is
1) +1 2) zero 3) +2 4) +8
45. There is no loss of exchange energy at
1) d 3 configuration 2) d 5 configuration 3) d 6 configuration 4) d 4 configuration
46. Which of the following order are correct regarding ionization energies?
1) I 2 of Cr Mn Fe 2) I 2 of Ni Cu Zn
3) I 3 of Ni Cu Zn 4) I 3 of Mn Co Fe
47. 1mole of Fe2+ ions are oxidised to Fe3+ ions with the help of (in acidic medium)
1) 1/5moles of KMnO 4 2) 5/3moles ofKMnO4
3) 2/5moles of KMnO 4 4) 5/2moles of KMnO4
48. Pick out the incorrect statement:
1) MnO42 is quite strongly oxidizing and stable only in very strong alkalies. In dilute
alkali, neutral solutions, it disproportionates.
2) In acidic solutions, MnO4 is reduced toMn2+ and thus,KMnO 4 is widely used as
SR STAR CO SC(MODEL-A&B)
oxidising agent.
3) KMnO4 does not acts as oxidising agent in alkaline medium.
4) KMnO4 is manufactured by the fusion of pyrolusite ore with KOH in presence of
air or KNO3, followed by electrolytic oxidation in alkaline solution.
49. In general, actinides exhibit more number of oxidation states than lanthanoids. This is
because
1) there is a similarly between 4f and 5f orbitals in their angular part of wave function
2) The actinoids are more reactive than lanthanoids
3) The 5f orbitals extend farthar from nucleus than 4f-orbitals
4) The 5f orbitals are more buried than the 4f-orbitals
50. All the following statements are regarding aqueous solutions. Identify true statements
among the following:
1) Ce4 is good oxidising agent 2) Eu 2 is good reducing agent
3) La 3 and Lu 3 ions are colourless 4) All of the above
