An equal volume of a reducing agent is titrated separately with 1M KMnO4 in acid neutral and alkaline media. The volumes of KMnO4 required are 20 ml. in acid 33.4 ml. neutral and 100 ml in alkaline media. Find out the oxidation state of manganese in each reduction product. Give the balanced equations for all three half reactions. Find out the volume of
1M K2Cr2O7 consumed; if the same volume of the reducing agent is titrated in acid medium.
Answer
(A)
The oxidation states of manganese are +2, +4, +6 and the volume of K2Cr2O7 is 16.66 ml
3
The correct set of quantum numbers for the unpaired electron of chlorine atom is
Answer
(C)
n = 3, l = 1, m = 1
4
The correct ground state electronic configuration of chromium atom is
Answer
(A)
[Ar] 3d5 4s1
5
Which one of the following is the smallest in size?
Answer
(D)
Na+
6
Sodium sulphate is soluble in water whereas barium sulphate is sparingly soluble because
Answer
A
B
7
The molecule which has zero dipole moment is:
Answer
(B)
BF3
8
The molecule which has pyramidal shape is
Answer
(A)
PCl3
9
The compound in which $$\mathop C\limits^* $$ uses its sp3 hybrid orbitals for bond formation is
Answer
(C)
(CH3)3 $$\mathop C\limits^* $$ OH
10
Which of the following is paramagnetic?
Answer
(A)
$$O_2^-$$
11
Eight gram each of oxygen and hydrogen at 27oC will have the total kinetic energy in the ratio of _______.
Answer
(E)
16:1
12
The electrolysis of molten sodium hydride liberates ____ gas at the _____
Answer
(D)
hydrogen, anode
13
Write down the balanced equation for the reaction when:
Potassium ferricyanide reacts with hydrogen peroxide in basic solution
n-Butane is produced by the monobromination of ethane followed by the Wurtz reaction. Calculate the volume of ethane at NTP required to produce 55 g n-Butane, if the bromination takes place with 90 percent yield and the Wurtz reaction with 85 percent yield.
Answer
(C)
55.552 L
15
The vapour pressure of a dilute aqueous solution of glucose (C6H12O6) is 750 mm of mercury at 373 K. Calculate (i) molality, and (ii) mole fraction of the solution.
