The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [$$\alpha_0$$ is Bohr radius]
Answer
(C)
$${h^2 \over {32{\pi ^2}m\alpha _0^2}}$$
2
An organic compound undergoes first-order decomposition. The time taken for its decomposition to 1/8 and 1/10 of its initial concentration are t1/8 and t1/10 respectively. What is the value of $$\left[ {{{{t_{1/8}}} \over {{t_{1/10}}}}} \right] \times 10$$? ($${\log _{10}}2 = 0.3$$)
Answer
9
3
The periodic table consists of 18 groups. An isotope of copper, on bombardment with protons undergoes a nuclear reaction yielding element X as shown below. To which group, element X belongs in the periodic table?
29.2 % (w/w) HCl stock solution has density of 1.25 g mL-1 . The molecular weight of HCl is 36.5 g mol-1 .
The volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is
Answer
8
5
Choose the correct reason for the stability of the Iyophobic colloidal particles
Answer
A
D
6
In allene (C3H4), the type(s) of hybridisation of the carbon atoms is (are):
Answer
(B)
sp and sp2
7
The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [$$\alpha_0$$ is Bohr radius]
Answer
(C)
$${h^2 \over {32{\pi ^2}m\alpha _0^2}}$$
8
A compound MpXq has cubic close packing (ccp) arrangement of X. Its unit cell structure is shown below. The empirical formula of the compound is
Answer
(B)
MX2
9
As per IUPAC nomenclature, the name of the complex $$[Co{({H_2}O)_4}{(N{H_3})_2}]C{l_3}$$ is
Answer
(D)
Diamminetetraaquacobalt (III) chloride.
10
Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen?
Answer
(B)
HNO3, NO, N2, NH4Cl
11
For one mole of a van der Waals gas when b = 0 and T = 300 K, the PV vs. 1/V plot is shown below. The value of the van der Waals constant a (atm L2 mol$$-$$2) is
Answer
(C)
1.5
12
The number of aldol reactions that occur in the given transformation are
Answer
(C)
3
13
The colour of light absorbed by an aqueous solution of CuSO4 is
Answer
(A)
orange-red
14
The number of optically active products obtained from the complete ozonolysis of the given compound is ______.
Answer
(A)
0
15
Which of the following hydrogen halides reacts with AgNO3(aq.) to give a precipitate that dissolves in Na2S2O3 (aq.) ?
Answer
A
C
D
16
Identify the binary mixtures that can be separated into individual compounds, by differential extraction, as shown in the given scheme.
Answer
B
D
17
For an ideal gas, consider only P-V work in going from an initial state X to the final state Z. The final state Z can be reached by either of the two paths shown in the figure. Which of the following choice(s) is(are) correct? (Take $$\Delta$$S as change in entropy and W as work done)
Answer
A
C
18
Which of the following molecules, in pure form, is(are) unstable at room temperature?
Answer
B
C
19
The substituents R1 and R2 for nine peptides are listed in the table given below. How many of these peptides are positively charged at pH = 7.0 ?
Peptide
$${R_1}$$
$${R_2}$$
I
H
H
II
H
$$C{H_3}$$
III
$$C{H_2}COOH$$
H
IV
$$C{H_2}CON{H_2}$$
$${(C{H_2})_4}N{H_2}$$
V
$$C{H_2}CON{H_2}$$
$$C{H_2}CON{H_2}$$
VI
$${(C{H_2})_4}N{H_2}$$
$${(C{H_2})_4}N{H_2}$$
VII
$$C{H_2}COOH$$
$$C{H_2}CON{H_2}$$
VIII
$$C{H_2}OH$$
$${(C{H_2})_4}N{H_2}$$
IX
$${(C{H_2})_4}N{H_2}$$
$$C{H_3}$$
Answer
4
20
When the following aldohexose exists in its D-configuration, the total number of stereoisomers in its pyranose form is ____________.
