Chemistry Test 109

Result

Chemistry Test 109

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Weekly Quiz Competition

Question 1
4 / -1

In 500 ml of 0.2M-NaCl solution, 1500 ml of 0.4 M-MgCl₂ solution is mixed. The only incorrect final concentration of ion is (assume volume to be additive) :

A
[Na⁺] = 0.2 M

B
[Mg²⁺] = 0.3 M

C
[Cl^–] = 0.65 M

D
[Mg²⁺] = 7.2 g/L

Solution

Total volume = 500 + 1500 = 2000 ml = 2L

Moles of [Na⁺] ions = 0.2 × 0.5 = 0.1

Concentration of [Na⁺] ions = 0.1/2 = 0.0M

Moles of [Mg²⁺] ions = 0.4 × 1.5 = 0.6

Concentration of [Mg²⁺] ions
= 0.6/2 = 0.3M = 7.2gm/L

Moles of [Cl^–] ions = 0.2 × 0.5 + 2 × 0.4 × 1.5 = 1.3

Concentration of [Cl^–] ions = 1.3/2 = 0.65 M
Question 2
4 / -1

Find enthalpy of neutralisation of NH₄OH and HCN in aqueous solution if enthalpy of ionisation of NH₄OH and HCN are 7 kJ/mol and 8 kJ/mol. also enthalpy of ionisation of H₂O is 57.3 kJ/mole.

A
–15 kJ/mol

B
– 42.3 kJ/mol

C
+1 kJ/mol

D
42.3 kJ/mol
Question 3
4 / -1

Calculate the pH at the equivalence point in the titration of 25 mL of 0.10M formic acid with a 0.1M NaOH solution (given that pK_a of formic acid = 3.74). [log2 = 0.30]

A
4.74

B
8.74

C
8.22

D
6.06

Solution
Question 4
4 / -1

Copper sulphate solution is electrolysed between two platinum electrodes. A current is passed until 1.6 g of oxygen is liberated at anode. The amount of copper deposited at the cathode during the same period is : [At. mass of Cu = 63.6]

A
6.36 g

B
63.6 g

C
12.7 g

D
3.2 g

Solution
Question 5
4 / -1

Product (P) , Product P is :

A
(1)

B
(2)

C
(3)

D
(4)

Solution
Question 6
4 / -1

Major product (P) of given reaction will not give ?

A
1% FeCl₃ test

B
Na metal test

C
Iodoform test

D
Libermann nitroso test

Solution

Phenol does not gives idoform test.
Question 7
4 / -1

Give the product of the following reaction sequence-

A
(1)

B
(2)

C
(3)

D
(4)

Solution
Question 8
4 / -1

Which of the following nitrogen atom is maximum basic ?

A
b

B
a

C
c

D
All are same

Solution

Due to +M effect of both (b) and (c).

(a) is most basic.
Question 9
4 / -1

Which of the following is reducing carbohydrate and show mutarotation :

A
(1)

B
(2)

C
(3)

D
(4)

Solution

Carbohydrates which containing Free –OH group at anomeric carbon shown reducing nature.
Question 10
4 / -1

Select correctly matched reaction with major product :

A
(1)

B
(2)

C
(3)

D
(4)