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2013 AIMPT - Chemistry
1.
The value of Planck's constant is `6.63 × 10^(–34) Js`. The speed of light is `3 × 10^17 nm s^(–1)`. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of `6 × 10^15 s^(–1`?
a) 10
b) 25
c) 50
d) 75
2.
What is the maximum numbers of electrons that can be associated with the following set of quantum numbers?n = 3, l = 1 and m = –1
a) 10
b) 6
c) 4
d) 2
3.
What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20°C to 35°C? (`R = 8.314 J mol^(–1) K^(–1)`)
a) `342 kJ mol^(–1) `
b) `269 kJ mol^(–1) `
c) `34.7 kJ mol^(–1) `
d) `15.1 kJ mol^(–1) `
4.
A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be
a) 0.059 V
b) 0.59 V
c) 0.118 V
d) 1.18 V
5.
A reaction having equal energies of activation for forward and reverse reactions has
a) ` Delta S = 0`
b) `Delta G = 0`
c) ` Delta H = 0`
d) ` Delta H = Delta G = Delta S = 0`
6.
At 25°C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is `9.54 ohm^(–1) cm^2 mol^(–1)` and at infinite dilution its molar conductance is `238 ohm^(–1) cm^2 mol^(–1)`. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is
a) 2.080%
b) 20.800%
c) 4.008%
d) 40.800%
7.
Based on equation `E = –2.178 × 10^(–18) J (Z^2/n^2)` certain conclusions are written. Which of them is not correct?
a) The negative sign in equation simply means that the energy of electron bound to the nucleus is lower than it would be if the electrons were at the infinite distance from the nucleus.
b) Larger the value of n, the larger is the orbit radius.
c) Equation can be used to calculate the change in energy when the electron changes orbit.
d) For n = 1, the electron has a more negative energy than it does for n = 6 which means that the electron is more loosely bound in the smallest allowed orbit.
8.
A button cell used in watches functions as following
a) 1.10 V
b) 0.42 V
c) 0.84 V
d) 1.34 V
9.
How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M `HNO_3`? The concentrated acid is 70% `HNO_3`.
a) 45.0 g conc. `HNO_3`
b) 90.0 g conc. `HNO_3`
c) 70.0 g conc. `HNO_3`
d) 54.0 g conc. `HNO_3`
10.
The number of carbon atoms per unit cell of diamond unit cell is
a) 4
b) 8
c) 6
d) 1
11.
Maximum deviation from ideal gas is expected from
a) `H_(2(g))`
b) `N_(2(g))`
c) `CH_(4(g))`
d) `NH_(3(g))`
12.
A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is `2.72 g cm^(–3`. The molar mass of the metal is (N_A Avogadro's constant = `6.02 xx 10^23 mol^(-1`)
a) `40 g mol^( -1`
b) `30 g mol^( -1`
c) `27 g mol^( -1`
d) `20 g mol^( -1`
13.
Dipole-induced dipole interactions are present in which of the following pairs?
a) `H_2O` and alcohol
b) `Cl_2` and `CCl_4`
c) `HCl` and `He` atoms
d) `SiF_4` and `He` atoms
14.
A magnetic moment of 1.73 BM will be shown by one among the following
a) `[Cu(NH_3)_4]^(2+`
b) `[Ni(CN)_4]^(2-`
c) `TiCl_4`
d) `[CoCl_6]^(4-`
15.
Roasting of sulphides gives the gas X as a byproduct. This is a colorless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic acts as a reducing agent and its acid has never been isolated. The gas X is
a) `H_2S`
b) `SO_2`
c) `CO_2`
d) `SO_3`
16.
Which is the strongest acid in the following?
a) `H_2SO_4`
b) `HCIO_3`
c) `HClO_4`
d) `H_2SO_3`
17.
Which of the following is paramagnetic?
a) `CO`
b) ` O_2^-`
c) `CN^-`
d) `NO^+`
18.
Which of the following structure is similar to graphite?
a) `BN`
b) `B`
c) `B_4C`
d) `B_2H_6`
19.
The basic structural unit of silicates is
a) `SiO^-`
b) `SiO_4^(4-`
c) `SiO_3^(2-`
d) `SiO_4^(2-`
20.
Reaction by which Benzaldehyde cannot be prepared?
a) 1
b) 2
c) 3
d) 4
21.
Which of the following does not give oxygen on heating?
a) `KClO_3`
b) `Zn(ClO_3)_2`
c) `K_2Cr_2O_7`
d) `(NH_4)2Cr_2O_7`
22.
Which of the following lanthanoid ions is diamagnetic?(At.no.Ce=58, Sm = 62, Eu = 63, Yb = 70)
a) `Ce^(2+`
b) `Sm^(2+`
c) `Eu^(2+`
d) `Yb^(2+`
23.
Identify the correct order of solubility in aqueous medium
a) CuS > ZnS > `Na_2S`
b) ZnS > `Na_2S` > CuS
c) `Na_2S` > CuS > ZnS
d) `Na_2S` > ZnS > CuS
24.
`XeF_2` is isostructural with
a) `TeF_2`
b) ` ICl_2^-`
c) `SbCl_3`
d) `BaCl_2`
25.
An excess of `AgNO_3` is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium(III) chloride. The number of moles of `AgCl` precipitated would be
a) 0.001
b) 0.002
c) 0.003
d) 0.01
26.
Which of these is least likely to act as a Lewis base?
a) `CO`
b) `F-`
c) `BF_3`
d) `PF_3`
27.
`KMnO_4` can be prepared from `K_2MnO_4` as per the reaction:`3MnO_4^(2-) + 2H_2O rarr 2MnO_4^(-) + MnO_2 + 4OH^-`The reaction can go completion by removing OH- ions by adding
a) HCl
b) KOH
c) `CO_2`
d) `SO_2`
28.
Which of the following is electron-deficient?
a) `(CH_3)_2`
b) `(SiH_3)_2`
c) ` (BH_3)_2`
d) ` PH_3`
29.
Structure of the compound whose IUPAC name is 3- Ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is (refer image for options)
a) 1
b) 2
c) 3
d) 4
30.
Which of these is not a monomer for a high molecular mass silicone polymer?
a) `MeSiCl_3`
b) `Me_2SiCl_2`
c) `Me_3SiCl`
d) `PhSiCl_3`
31.
Which of the following statements about the interstitial compounds is incorrect?
a) They retain metallic conductivity
b) They are chemically reactive
c) They are much harder than the pure metal
d) They have higher melting points than the pure metal
32.
Which one of the following molecules contains no `pi` bond?
a) `CO_2`
b) `H_2O`
c) `SO_2`
d) `NO_2`
33.
Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statements is not true
a) A 0.2% solution of phenol is an antiseptic while 1% solution acts as a disinfectant
b) Chlorine and Iodine are used as strong disinfectants
c) Dilute solutions of Boric acid and Hydrogen peroxide are strong antiseptics
d) Disinfectants harm the living tissues
34.
Among the following ethers, which one will produce methyl alcohol on treatment with hot concentrated HI? (refer image for options)
a) 1
b) 2
c) 3
d) 4
35.
Nylon is an example of
a) Polyester
b) Polysaccharide
c) Polyamide
d) Polythene
36.
The structure of isobutyl group in an organic compound is (refer image for options)
a) 1
b) 2
c) 3
d) 4
37.
Nitrobenzene on reaction with conc. `HNO_3`/`H_2SO_4` at 80-100°C forms which one of the following products?
a) 1, 2-Dinitrobenzene
b) 1, 3-Dinitrobenzene
c) 1, 4-Dinitrobenzene
d) 1, 2, 4-Trinitrobenzene
38.
Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?
a) ` – C -=N`
b) ` – SO_3H`
c) ` –COOH`
d) `–NO_2`
39.
`6.02 xx 10^20` molecules of urea are present in 100 mL of its solution. The concentration of solution is
a) 0.02 M
b) 0.01 M
c) 0.001 M
d) 0.1 M
40.
Which of the following is a polar molecule?
a) `BF_3`
b) `SF_4`
c) ` SiF_4`
d) `XeF_4`
41.
Which is the monomer of Neoprene in the following?
a) 1
b) 2
c) 3
d) 4
42.
In the reaction, A is
a) `HgSO_4`/`H_2SO_4`
b) `Cu_2Cl_2`
c) `H3PO_2 and H_2O`
d) `H^+`/`H_2O`
43.
The radical (refer image) is aromatic because it has
a) 6 p-orbitals and 6 unpaired electrons
b) 7 p-orbitals and 6 unpaired electrons
c) 7 p-orbitals and 7 unpaired electrons
d) 6 p-orbitals and 7 unpaired electrons
44.
The order of stability of the following tautomeric compounds is
a) I > II > III
b) III >II > I
c) II > I > III
d) II > III > I
45.
Which of the following compounds will not undergo Friedal-Craft's reaction easily?
a) Cumene
b) Xylene
c) Nitrobenzene
d) Toluene
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