Which of the following compounds will form a significant amount of meta product during the mono-nitration reaction?
Answer: (1)
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On treatment of 100 mL of 0.1 M solution of CoCl3.6H2O with excess AgNO3; 1.2 × 1022 ions are precipitated. The complex is :
1) [Co(H2O)6]Cl3 2) [Co(H2O)5Cl]Cl2.H2O 3) [Co(H2O)4Cl2]Cl.2H2O 4) [Co(H2O)3Cl3].3H2O Answer: (2) Millimoles of AgNO3 = [(1.2 x 1022) / (6 *... View Article
The most abundant elements by mass in the body of a healthy human adult are: Oxygen (61.4%); Carbon (22.9%), Hydrogen (10.0%); and Nitrogen (2.6%). The weight which a 75 kg person would gain if all 1H atoms are replaced by 2H atoms is :
1) 7.5 kg 2) 10 kg 3) 15 kg 4) 37.5 kg Answer: (1) Mass of hydrogen = (10/100 )... View Article
Sodium salt of an organic acid ‘X’ produces effervescence with conc. H2SO4. ‘X’ reacts with the acidified aqueous CaCl2 solution to give a white precipitate which decolourises the acidic solution of KMnO4. ‘X’ is :
1) CH3COONa 2) Na2C2O4 3) C6H5COONa 4) HCOONa Answer: (2)
In the following reactions, ZnO is respectively acting as a/an :
(a) ZnO + Na2O → Na2ZnO2 (b) ZnO + CO2 → ZnCO3 1) acid and acid 2) acid and base... View Article
The products obtained when chlorine gas reacts with cold and dilute aqueous NaOH are :
1) Cl− and ClO− 2) Cl− and ClO2 − 3) ClO− and ClO3− 4) ClO2− and ClO3 Answer: (1)
The group having isoelectronic species is :
1) O2−, F−, Na, Mg2+ 2) O−, F−, Na+, Mg2+ 3) O2−, F−, Na+, Mg2+ 4) O−, F−, Na, Mg+... View Article
A water sample has ppm level concentration of following anions
F– = 10; SO2-4 = 100; NO3– = 50 The anion/anions that make/makes the water sample unsuitable for drinking is/... View Article
Which of the following reactions is an example of a redox reaction?
1) XeF6 + H2O → XeOF4 + 2HF 2) XeF6 + 2H2O → XeO2 F2 + 4HF 3) XeF4 +... View Article
Which of the following species is not paramagnetic?
1) O2 2) B2 3) NO 4) CO Answer: (4) CO has 14 electrons (even) ∴ it is diamagnetic. NO... View Article
Both lithium and magnesium display several similar properties due to the diagonal relationship; however, the one which is incorrect, is :
1) both form nitrides 2) nitrates of both Li and Mg yield NO2 and O2 on heating 3) both form... View Article
pKa of a weak acid (HA) and pKb of a weak base (BOH) are 3.2 and 3.4, respectively. The pH of their salt (AB) solution is :
1) 7.0 2) 1.0 3) 7.2 4) 6.9 Answer: (4) pH = 7 + [(1 / 2) (pKa – pKb)]... View Article
Two reactions R1 and R2 have identical pre-exponential factors. The activation energy of R1 exceeds that of R2 by 10 kJ mol−1. If k1 and k2 are rate constants for reactions R1 and R2 respectively at 300 K, then ln (k2/k1) is equal to (R = 8.314 J mol−1K−1)
1) 6 2) 4 3) 8 4) 12 Answer: (2)
The radius of the second Bohr orbit for the hydrogen atom is : (Planck’s Constant. h = 6.6262 × 10−34 Js; the mass of electron = 9.1091 × 10−31 kg; charge of electron e = 1.60210 × 10−19 C; permittivity of vacuum ∈0 = 8.854185 × 10−12 kg−1m−3A2)
1) 0.529 Å 2) 2.12 Å 3) 1.65 Å 4) 4.76 Å Answer: (2) r = a0 (n2 / Z)... View Article
The freezing point of benzene decreases by 0.45oC when 0.2 g of acetic acid is added to 20 g of benzene. If acetic acid associates to form a dimer in benzene, percentage association of acetic acid in benzene will be : (Kf for benzene = 5.12 K kg mol−1)
1) 74.6% 2) 94.6% 3) 64.6% 4) 80.4% Answer: (2) 0.45 = i (5.12) [(0.2 / 60) / 20] *... View Article
Which is the strongest reducing agent
1) Cr3+ 2) Cl− 3) Cr 4) Mn2+ Answer: (3) Positive E° is for Cr, hence it is the strongest... View Article
A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is ‘a’, the closest approach between two atoms in metallic crystal will be:
1) √2 a 2) a/√2 3) 2a 4) 2√2 a Answer: (2) In FCC, one of the faces is like... View Article
The Tyndall effect is observed only when the following conditions are satisfied:
(a) The diameter of the dispersed particles is much smaller than the wavelength of the light used. (b) The diameter... View Article
∆U is equal to :
1) Adiabatic work 2) Isothermal work 3) Isochoric work 4) Isobaric work Answer: (1) For adiabatic process, q = 0... View Article
1 gram of a carbonate (M2CO3) on treatment with excess HCl produces 0.01186 moles of CO2. The molar mass of M2CO3 in g mol−1 is :
1) 118.6 2) 11.86 3) 1186 4) 84.3 Answer: (4) M2CO3 + 2HCl → 2MCl + H2O + CO2 =... View Article
