Q.1.
Measuring Zeta potential is useful in determining which property of colloidal solution? [NEET 2020]
-
59%
a) Stability of the colloidal particles
-
19%
b) Size of the colloidal particles
-
14%
c)Viscosity
-
8%
d)OSolubility
Q.2.
On electrolysis of dil. sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be ... [NEET 2020]
-
13%
a) H2S gas
-
17%
b) SO2 gas
-
37%
c) Hydrogen gas
-
33%
d) Oxygen gas
Q.3.
The number of Faradays(F) required to produce 20 g of calcium from molten CaCl2 (Atomic mass of Ca = 40 g mol-1) is [NEET 2019]
-
21%
a) 3
-
21%
b) 4
-
27%
c) 1
-
31%
d) 2
Q.4.
What is the change in oxidation number of carbon in the following reaction? CH4 (g) + 4Cl2 (g) → CClsub>4 (l)+ 4HCl(g) [NEET 2019] Answer: (a)
-
68%
a) – 4 to + 4
-
16%
b) 0 to – 4
-
10%
c) + 4 to + 4
-
6%
d) 0 to + 4
Q.5.
Which of the following reactions are disproportionation reaction? [NEET 2019] (a) 2Cu+ → Cu2+ + Cu0 (b) 3MnO42- + 4H+ → 2MnO4 + MnO2 + 2H2O (c) 2KMnO4 → K2 MnO4+ MnO2 + O2 (d) 2MnO4- + 3Mn2+ + 2H2 O +5MnO2+ 4H+ Select the correct option from the following
-
26%
a)(a) and (b) only
-
40%
b) (a), (b) and (c)
-
23%
c)(a), (c) and (d)
-
11%
d) (a) and (d) only
Q.6.
For the cell reaction 2Fe3+ (aq) + 2I- (aq) → 2Fe2+ (aq) + I2 (aq) EΘcell=0.24 V at 298 K. The standard Gibbs energy (ΔrG Θ) of the cell reaction is : [Given that Faraday constant F = 96500 C mol-1]
-
40%
a) – 46.32 kJ mol–1
-
32%
b) – 23.16 kJ mol–1
-
20%
c)46.32 kJ mol–1
-
8%
d)23.16 kJ mol–1
Q.7.
he correct order of N-compounds in its decreasing order of oxidation states is ... [NEET 2018]
-
27%
a) HNO3, NH4Cl, NO, N2 2mole -1
-
24%
b)HNO3, NO, NH4Cl, N2
-
39%
c)HNO3, NO, N2, NH4Cl
-
10%
d) NH4Cl, N2, NO, HNO3
Q.8.
Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below : Then the species undergoing disproportionation is [NEET 2018]
-
22%
a) Br2
-
44%
b) BrO4-
-
15%
c) 3BrO3-
-
19%
d) HBrO
Q.9.
For the redox reaction ... [2018] MnO4- + C2O42- + H+ → Mn2+ + CO2 + H2O the correct coefficients of the reactants for the balanced equation are
-
8%
a)MnO4- = 3; C2O42- = 16; H+ = 5
-
42%
b) MnO4- = 2; C2O42- = 5; H+ = 16
-
27%
c) MnO4- = 16; C2O42- = 5; H+ = 2
-
23%
d) MnO4- = 5; C2O42- = 16; H+ = 2
Q.10.
For a cell involving one electron E&dgecell = 0.59 V at 298 K, the equilibrium constant for the cell reaction is : Given that
-
19%
a) 1.0 × 102
-
33%
b) 1.0 × 105
-
43%
c) 1.0 × 1010
-
5%
d) 1.0 × 1030
Q.11.
The chemical reaction.2AgCls + H2(g) → 2HCl(aq) + 2Ag(s)taking place in a galvanic cell is represented by the notation [ AFMC 2009]
-
10%
a)Pts| H2(g).1 bar| 1 M KCl(aq)| AgCl(s)| Ag(s)
-
50%
b)Pts| H2(g).1 bar| 1 M HCl(aq)| 1M Ag+(aq)| Ag(s)
-
20%
c)Pts| H2(g).1 bar| 1 M HCl(aq)| AgCl(s)| Ag(s)
-
20%
d)Pts| H2(g).1 bar| 1 M HCl(aq)| Ag(s)| AgCl(s)
Q.12.
Among the following compound, the oxidation state of Mn is highest in ..[ AFMC 2010]
-
64%
a) KMnO4
-
25%
b) K2MnO4
-
4%
c) MnO2
-
7%
d) Mn2O3
Q.13.
In alkaline condition KMhO0 reacts as follows: 2KMnO4 + 2KOH → 2K2MnO4 + H2O + O The equivalent weight of KMnO4 would be ( At. mass of K=39, Mn=55, O=16)
-
14%
a)79.0
-
24%
b) 31.6
-
19%
c)52.7
-
43%
d)158.0
Explanation
Q.14.
How many electrons are involved in oxidation by KMnO4 in basic medium
-
26%
a) 1
-
30%
b) 2
-
30%
c)5
-
13%
d)3
Q.15.
Which of the following chemical reactions depicts the oxidising behavior of H2SO4 [ AIEEE 2006]
-
48%
a) 2HI + H2SO4 → I2 + SO2 + 2H2O
-
17%
b)Ca(OH)2 + H2SO4 → CaSO4 + 2H2O
-
17%
c)NaCl + H2SO4 → NaHSO4 + HCl
-
17%
d)2PCl5 + H2SO4 → 2POCl3 +2HCl + SO2Cl2
Explanation
Q.16.
The reaction 3ClO- → Cl3- + 2Cl- is an example of ..[ IIT 2001]
-
5%
a) Oxidation reaction
-
24%
b) Reduction reaction
-
62%
c) disproportion reaction
-
10%
d) decomposition reaction
Q.17.
Cr2O72- + X + H+ → Cr3+ + H2O + oxidised product of X X in above reaction can not be
-
6%
a)C2O42-
-
62%
b)SO42-
-
6%
c)S2-
-
25%
d)Fe2+
Q.18.
Which one of the following leads to redox reaction
-
39%
a) AgNO3 + HCl
-
17%
b) KOH + HCl
-
33%
c)KI + Cl2
-
11%
d)NH3 + HCl
Explanation
Q.19.
On reduction of KMnO4 by oxalic acid in acidic medium, the oxidation number of Mn changes. What is the magnitude of this charge? [ AIEEE 2007]
-
58%
a) From 7 to 2
-
11%
b) From 6 to 2
-
11%
c)From 5 to 2
-
21%
d)From 7 to 4
Explanation
Q.20.
Number of moles of K2Cr2O7 reduced by one mole of Sn2+ ions is [ Hariyana CEET 2000]
-
47%
a) 1/3
-
24%
b) 3
-
18%
c) 1/6
-
12%
d) 6
Q.21.
In which of the following changes there is a transfer of five electrons?
-
44%
a)MnO4- → Mn2+
-
12%
b) CrO4- → Cr3+
-
19%
c)MnO4- → MnO2
-
25%
d)Cr2O72- → 2Cr3+
Q.22.
he colour of K2Cr2O7 changes from red orange to lemon yell on treatment with aqueous KOH because of
-
5%
a) Reduction of Cr(VI) to Cr(III)
-
11%
b) Formation of chromium ion to chromate
-
58%
c)Conversion of dichromate ion to chromate
-
26%
d)Oxidation of potassium hydroxide to potassium peroxide
Q.23.
Cr2O72- → Cr3+ eq.wt of Cr2O72- is
-
47%
a)mol.wt/6
-
20%
b) mol.wt/3
-
27%
c)mol.wt./4
-
7%
d)mol.wt./8
Explanation
Q.24.
What is the equivalent mass of IO4- when it is converted into I2 in acid medium
-
14%
a) M/6
-
64%
b) M/7
-
14%
c) M/5
-
7%
d) M/4
Explanation
Q.25.
xMnO4-+ yHSO3- → 2Mn2+ + 2H2O + OH-+ zSO42- In this reaction value of x, y and z are
-
42%
a)2, 5, 5
-
42%
b) 5, 2, 9
-
8%
c)3, 5, 5
-
8%
d)2, 6, 6
Q.26.
The standard reduction potential of Cu2+ / Cu and Cu2+ / Cu+ are 0.337 and 0.153 respectively. the standard electrode potential of Cu+ / Cu half cell is ... [ IIT 1997]
-
9%
a) 0.184 V
-
45%
b) 0.827 V
-
45%
c)0.521 V
-
0%
d)0.490 v
Q.27.
A current of 2amp when passed for 5 hours through a moltan salt deposits 22.2 g of metal of atomic massThe oxidation state of the metal in the metal salt is
-
17%
a) +1
-
33%
b) +2
-
42%
c) +3
-
8%
d) +4
Explanation
Q.28.
The compound that can work both as an oxidising as well as a reducing agent is [ CPMT 1986]
-
19%
a) KMnO4
-
62%
b) H2O2
-
0%
c) Fe2(SO4)3
-
19%
d) K2Cr2O7
Q.29.
For the redox reaction. the correct coefficient of the reactants for the balanced reaction are
-
33%
a) MnO4-=2; C2O4-=5; H+=16
-
22%
b) MnO4-=16; C2O4-=3; H+=12
-
11%
c)MnO4-=15; C2O4-=16; H+=12
-
33%
d)MnO4-=2; C2O4-=16; H+=5
Explanation
Q.30.
In acidic, dichromatic ion oxides ferrous ion to ferric ion. If the gram molecular weight of potassium dichromate is 294 grams, its gram equivalent weight is ... grams
-
10%
a) 294
-
30%
b) 127
-
30%
c)49
-
30%
d)24.5
Explanation
