classification of elements, chemical bonding, periodicity in properties & physical transformation - Category wise Question and Answer Practice Test with Solutions

classification of elements, chemical bonding, periodicity in properties & physical transformation PRACTICE TEST [4 - EXERCISES]

set 1

set 2

set 3

set 4

Question : 21

Match List-I with List-II:

List-I List-II
A. Li2 1. 3
B. N2 2. 1.5
C. Be2 3. 1.0
D. O2 4. 0
  5. 2
Select the correct answer using the codes given below the list:

a) A – (4), B – (1), C – (5), D – (3)

b) A – (2), B – (3), C – (1), D – (5)

c) A – (3), B – (1), C – (4), D – (5)

d) A – (3), C – (2), C – (5), D – (1)

Answer: (c)

B.O. = $1/2$ [Nb – Na ]

∴ Li2 = ${4 - 2}/2$ = 1;

N2 = 3;

Be = 0,

O2 = 2

Question : 22 [MPPCS (Pre) 2004]

Because of impurities the boiling point of a liquid

a) Decreases

b) Remains constant

c) Increases

d) They are not related

Answer: (c)

Question : 23

Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively.
It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas, in the case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is (are) correct?

  1. In beakers A and B, an exothermic process has occurred.
  2. In beakers A and B, an endothermic process has occurred.
  3. In beaker C exothermic process has occurred.
  4. In beaker C endothermic process has occurred.

a) 1 and 4

b) 1 only

c) 2 only

d) 2 and 3

Answer: (a)

Question : 24

Which of the following statements about pH and $H^+$ ion concentration are incorrect?

  1. Addition of one drop of concentrated HCl in NH4OH solution decreases pH of the solution.
  2. A solution of the mixture of one equivalent of each of CH3COOH and NaOH has a pH of 7
  3. pH of pure neutral water is not zero
  4. A cold and concentrated H2SO4 has lower $H^+$ ion concentration than a dilute solution of H2SO4
Choose the correct option from the codes given below:

a) 1, 2 and 4

b) 1, 2 and 3

c) 1, 3 and 4

d) 2, 3 and 4

Answer: (a)

CH3COOH is weak acid while NaOH is strong base, so one equivalent of NaOH can not be neutralized with one equivalent of CH3COOH.

Concentrated H2SO4 has higher H+ ion concentration than dilute solution of H2SO4.

Question : 25

Consider the following statements :

  1. Living beings carry out their metabolic activities with in an optimal pH range.
  2. There are a variety of strengths when you study acids and base.
Which of these statement(s) above is/are correct ?

a) 1 and 2 both

b) 1 only

c) 2 only

d) None

Answer: (a)

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