Based on VSEPR theory, the number of 90 degree F-Br-F angles in BrF5 is
Answer
0
2
The species which by definition has ZERO standard molar enthalpy of formation at 298 K is
Answer
(B)
Cl2 (g)
3
Among the following, the intensive property is (properties are)
Answer
A
B
4
Aqueous solution of HNO3, KOH and CH3COOH and CH3COONa of identical concentrations are provided. The pairs of solutions which form a buffer upon mixing is(are)
Answer
C
D
5
Amongst the following the total number of compounds whose aqueous solution turns red litmus paper blue is
KCN, K2SO4, (NH4)2C2O4, NaCl, Zn(NO3)2, FeCl3, K2CO3, NH4NO3 and LiCN
Answer
3
6
The reagent(s) used for softening the temporary hardness of water is (are)
Answer
B
C
D
7
The total number of cyclic isomers possible for a hydrocarbon with the molecular formula C4H6 is
Answer
5
8
The synthesis of 3-octyne is achieved by adding a bromoalkane into a mixture of sodium amide and and alkyne
Answer
(D)
BrCH2CH2CH2CH3 and CH3CH2C $$\equiv$$ CH
9
The bond energy (in kcal mol-1) of a C-C single bond is approximately
Answer
(C)
100
10
The concentration of potassium ions inside a biological cell is at least twenty times higher than the outside. The resulting potential difference across the cell is important in several processes such as transmission of
nerve impulses and maintaining the ion balance. A simple model for such a concentration cell involving a
metal M is :
M(s) | M+ (aq ; 0.05 molar) || M+ (aq ; 1 molar) | M(s)
For the above electrolytic cell the magnitude of the cell potential | Ecell | = 70 mV.
For the above cell :
Answer
(B)
Ecell > 0 ; $$\Delta G < 0$$
11
The concentration of potassium ions inside a biological cell is at least twenty times higher than the outside. The resulting potential difference across the cell is important in several processes such as transmission of
nerve impulses and maintaining the ion balance. A simple model for such a concentration cell involving a
metal M is :
M(s) | M+ (aq ; 0.05 molar) || M+ (aq ; 1 molar) | M(s)
For the above electrolytic cell the magnitude of the cell potential | Ecell | = 70 mV.
If the 0.05 molar solution of M+ is replaced by a 0.0025 molar M+ solution, then the magnitude of the cell potential would be :
Answer
(C)
140 mV
12
The concentration of R in the reaction R $$\to$$ P was measured as a function of time and the following data is obtained
[R] molar
1.0
0.75
0.40
0.10
t (min.)
0.0
0.05
0.12
0.18
The order of reaction is
Answer
0
13
The number of neutrons emitted when $${}_{92}^{235}U$$ undergoes controlled nuclear fission to $${}_{54}^{142}Xe$$ and $${}_{38}^{90}Sr$$ is
Answer
3
14
A student performs a titration with different burettes and finds titre values of 25.2 mL, 25.25 mL, and 25.0 mL. The number of significant figures in the average titre value is
Answer
3
15
The correct statement about the following disaccharide is :
Answer
(A)
Ring (a) is pyranonse with $$\alpha$$-glycosidic link.
16
In the reaction
the products are :
Answer
(D)
17
Plots showing the variation of the rate constant ($$k$$) with temperature ($$T$$) are given below. The point that follows Arrhenius equation is
Answer
(A)
18
The correct structure of ethylenediaminetetraacetic acid (EDTA) is
Answer
(C)
19
The ionisation isomer of $$\mathrm{[Cr(H_2O)_4Cl(NO_2)]Cl}$$ is
Answer
(B)
$$[Cr{({H_2}O)_4}C{l_2}](N{O_2})$$
20
In the Newman projection for 2,2-dimethylbutane, X and Y can, respectively, be
Answer
B
D
21
In the reaction
The intermediate(s) is(are)
Answer
A
C
22
Partial roasting of chalcopyrite produces
Answer
(A)
Cu$$_2$$S and FeO
23
Iron is removed from chalcopyrite as
Answer
(D)
FeSiO$$_3$$
24
In self-reduction, the reducing species is
Answer
(C)
S$$^{2-}$$
25
The total number of basic groups in the following form of lysine is
Answer
2
26
In the scheme given below, the total number of intra molecular aldol condensation products formed from Y is ____________.
Answer
1
27
Amongst the following, the total number of compounds soluble in aqueous NaOH is _________.
Answer
4
28
The value of $$n$$ in the molecular formula $$\mathrm{Be_n Al_2Si_6O_{18}}$$ is ___________.
