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 |
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 »Answer: (c)
B.O. = $1/2$ [Nb – Na ]
∴ Li2 = ${4 - 2}/2$ = 1;
N2 = 3;
Be = 0,
O2 = 2
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?
- In beakers A and B, an exothermic process has occurred.
- In beakers A and B, an endothermic process has occurred.
- In beaker C exothermic process has occurred.
- In beaker C endothermic process has occurred.
a) 1 and 4
b) 1 only
c) 2 only
d) 2 and 3
Answer »Answer: (a)
Question : 24
Which of the following statements about pH and $H^+$ ion concentration are incorrect?
- Addition of one drop of concentrated HCl in NH4OH solution decreases pH of the solution.
- A solution of the mixture of one equivalent of each of CH3COOH and NaOH has a pH of 7
- pH of pure neutral water is not zero
- A cold and concentrated H2SO4 has lower $H^+$ ion concentration than a dilute solution of H2SO4
a) 1, 2 and 4
b) 1, 2 and 3
c) 1, 3 and 4
d) 2, 3 and 4
Answer »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 :
- Living beings carry out their metabolic activities with in an optimal pH range.
- There are a variety of strengths when you study acids and base.
a) 1 and 2 both
b) 1 only
c) 2 only
d) None
Answer »Answer: (a)
IMPORTANT general science mcq EXERCISES
set 1 Online Quiz
Click to Start..general science mcq CATEGORIES
-
» Measurement And SI Units
-
» Measuring Devices And Scales
-
» Mechanics (Mass, Force, Acceleration, Work, Energy, Momentum, Velocity)
-
» Force Of Gravity, Solids And Fluids
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» Motion Under Gravity
-
» Physical Properties Of Materials
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» Light, Heat, Thermodynamics, Wave Motion, Sound, Optics & Oscillations
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» Electric Current And Magnetism
-
» Nuclear Physics And Conductivity
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» Modern And Space Physics, Sources Of Energy
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» General Concepts Of Chemistry
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» Nature Of Matter And Composition
-
» Atomic Structure Molecules And Nuclear Chemistry
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» Classification Of Elements, Chemical Bonding, Periodicity In Properties & Physical Transformation
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» Metals, Non Metals, Minerals, Ores, Properties, Uses
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» Alloys, Carbon & Its Various Forms, Hydrogen & Compounds, Sulphur, Nitrogen, Halogen & Inert Gases
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» Acids, Bases, Salts And Metals
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» Hydrocarbon, Alcohol, Polymer, Organic Acid And Explosive Substance
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» Fuel, Food Preservation, Nutrition, Medicine, Detergents And Fertilizers
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» Inorganic Chemistry
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» Organic Chemistry
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» Environmental Chemistry
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» Some Important Man Made Materials
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» Sub Divisions Of Biology
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» Genetics, Evolution Of Life & Ecological Biodiversity
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» Taxonomy
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» Heredity
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» Biofertilizer
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» Biological Classification Cell Tissues And Division
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» Human Anatomy
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» Blood Transport System
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» Digestion And Excretion
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» Photosynthesis
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» Vitamins, Nutrition, Health, Disease And Treatment
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» Endocrine Glands, Hormones
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» Physiology Of Plants, Humans And Animals
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» Reproduction
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» Genetic Engineering And Bio Technology
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