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JEE Advance - Chemistry (1987)

1
sp2 hybrid orbitals have equal s and p character.
Answer
(B)
FALSE
2
The brown ring complex compound is formulated as [Fe(H2O)5(NO)+]SO4. The oxidation state of iron is
Answer
(A)
1
3
(i) What is the weight of sodium bromate and molarity pf solution necessary to prepare 85.5 ml of 0.672 B solution when the half-cell reaction is

$$BrO_3^- + 6H^+ + 6e^- \to $$ $$Br^- + 3H_2O$$

(ii) What would be the weight as well as molarity if the half-cell reaction is:

$$2BrO_3^- + 12H^+ + 10e^- \to$$ $$Br_2 \,+ 6H_2O$$
Answer
(A)
(i) 1.446 gm, 0.112 M; (ii) 1.7532 g, 0.1344 M
4
In group IA, of alkali metals, the ionisation potential decreases on moving down the group. Therefore, lithium is a strongest reducing agent
Answer
(B)
FALSE
5
The first ionisation potential in electron volts of nitrogen and oxygen atoms are respectively given by
Answer
(A)
14.6, 13.6
6
Atomic radii of fluorine and neon in Angstrom units are respectively given by
Answer
(A)
0.72, 1.60
7
The electronegativity of the following elements increases in the order
Answer
(C)
Si, P, C, N
8
In benzene, carbon uses all the three p-orbitals for hybridisation.
Answer
(B)
FALSE
9
Hydrogen bond is maximum in
Answer
(A)
Ethanol
10
The value of PV for 5.6 litres of an ideal gas is ________ RT, at NTP.
Answer
0.25
11
A spherical balloon of 21 cm diameter is to be filled up with hydrogen at N.T.P from a cylinder containing the gas at 20 atmospheres at 27oC. If the cylinder can hold 2.82 litres of water, calculate the number of balloons that can be filled up.
Answer
10
12
Sodium when burnt in excess of oxygen gives sodium oxide.
Answer
(B)
FALSE
13
The metallic lustre exhibited by sodium is explained by
Answer
(B)
oscillation of loose electrons
14
Give reasons of the following :
Magnesium oxide is used for the lining of steel making furnace.
Answer
(C)
Magnesium oxide is basic in nature and reacts with acidic impurities of the steel making process.
15
Give reasons of the following:
Why is sodium chloride added during electrolysis of fused anhydrous magnesium chloride?
Answer
(C)
To increase the electrical conductivity of the electrolyte.
16
The IUPAC name of the compound
CH2 = CH $$-$$ CH(CH3)2
Answer
(B)
3-methylbut-1-ene
17
An unknown compound of carbon, hydrogen and oxygen contains 69.77% carbon and 11.63% hydrogen and has a molecular weight of 86. It does not reduce Fehling solution, but forms a bisulphite addition compound and gives a positive iodoform test. What are the possible structures?
Answer
(A)