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TOP Chemical Equation And Reaction Class 10 MCQ and Answers for Board Exam
Chemical Equation And Reaction Class 10 MCQ and Answers are the most important for the upcoming class 10 board and high school exams. If you are looking for important questions and answers of Chemical Equation And Reaction Class 10 Chemistry that can help you in the exam then you are in the right place. These questions will help you to prepare well for upcoming exams of Chemical Equation And Reaction.
Chemical Equation And Reaction Class 10 MCQ and Answers
1. Which of the following is (are) an endothermic process(es)?
(i) Dilution of sulphuric acid
(ii) Sublimation of dry ice
(iii) Condensation of water vapours
(iv) Evaporation of water
a) Both (i) & (iii)
b) Only (ii)
c) Only (iii)
d) Both (ii) & (iv)
Answer: d
2. In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the given can be used in place of lead nitrate?
a) Lead sulphate (insoluble)
b) Lead acetate
c) Ammonium nitrate
d) Potassium sulphate
Answer: b
3. Which of the given gases can be used for storage of fresh sample of an oil for a long time?
a) Carbon dioxide or oxygen
b) Nitrogen or oxygen
c) Carbon dioxide or helium
d) Helium or nitrogen
Answer: b
4. Fatty foods become rancid due to the process of ________
a) Oxidation
b) Corrosion
c) Reduction
d) Hydrogenation
Answer: a
5. Which information is not conveyed by a balanced chemical equation?
a) Physical states of reactants and products
b) Symbols and formulae of all the substances involved in a particular reaction
c) Number of atoms/molecules of the reactants and products formed
d) Whether a particular reaction is actually feasible or not
Answer: d
6. The Le- Chatlier principle states that ____
a) No reaction is reversible
b) All reactions are reversible at high temperatures
c) A system experiencing disturbance shifts direction of equilibrium to nullify the change
d) A system experiencing disturbance does not shift direction of equilibrium to nullify the change
Answer: c
7. A microfluid is the one in which ____
a) Fluid motion is restricted
b) Fluid molecules are free to move
c) Molecules do not take part in reaction
d) Fluid is compressed in due course of reaction
Answer: b
8. For early mixing, which of the following reactors/ combination of reactors is used?
a) CSTR followed by PFR
b) PFR
c) Two CSTRs in series
d) Two CSTRs in parallel
Answer: a
9. Which of the following is not a fluid – fluid reaction?
a) Reaction of chlorine with benzene to produce chlorobenzene
b) Soap formation by action of aqueous alkali on fatty acids
c) Action of ammonia on aqueous nitric acid
d) Combustion of coal
Answer: d
10. The Enhancement factor in liquid film is the ratio of ____
a) Rate of take up of gas by straight mass transfer to the ate of take up of gas by reaction
b) Rate of take up of gas by reaction to the rate of take up of gas by straight mass transfer
c) Rate of reaction at the interface to the rate of take up of gas by straight mass transfer
d) Rate of take up of gas by straight mass transfer to rate of reaction at the interface
Answer: b
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Chemical Equation And Reaction Class 10 MCQ and Answers
11. The relationship between enhancement factor and Hatta modulus for pseudo first order reaction is ____
a) E = MH
b) E < 5MH
c) 5E > MH
d) E > 5MH
Answer: d
12. The gas film resistance obtained in percentage if the gas film resistance is 10 hr.m3.Pa/ mol and the total resistance is 20.01 hr.m3.Pa/ mol is ____
a) 49.9%
b) 39.9%
c) 29.9%
d) 19.9%
Answer: a
13. If E = 104 and MH = 10, the nature of reaction is ____
a) First order
b) Second order
c) Pseudo first order
d) Negative order
Answer: c
14. The area under the curve of exit age distribution integrated between time, t = 0 and t = ∞ is ____
a) 0
b) 2
c) Unity
d) Infinite
Answer: c
15. Which of the following is not a characteristic of tracer?
a) Inertness
b) Non – reactive
c) Easily detectable
d) Adsorbance onto the reactor surface
Answer: d
16. If the residence time obtained for a reactor by the RTD experiments is less than that expected, it indicates the presence of ____
a) CSTR
b) PFR
c) Bubbling bed reactor
d) Dead volume
Answer: d
17. If the entire volume of a PFR is 10 m3 and dead volume is 2 m3, then the active volume of the reactor is ____
a) 20
b) 5
c) 8
d) 12
Answer: c
18. The variance of a PFR is ____
a) 1
b) 0
c) ∞
d) -1
Answer: b
19. The variance of a CSTR is ____
a) 1
b) 0
c) ∞
d) -1
Answer: c
20. According to tanks in series model, the spread of the tracer curve is proportional to ____
a) Square of distance from the tracer origin
b) Square root of distance from the tracer origin
c) Cube of distance from the tracer origin
d) Inverse square of distance from the tracer origin
Answer: b
Balancing Chemical Equations Questions And Answers
1. When a magnesium ribbon is burnt in the air, the ash formed is
a) Black
b) White
c) Yellow
d) Pink
Answer: b
2. Colour of magnesium oxide is
a) White
b) Blue
c) Grey
d) Pink
Answer: a
3. Reaction of ‘magnesium’ with air is
a) Exothermic reaction
b) Endothermic reaction
c) Reversible reaction
d) Substitution reaction
Answer: a
4. What chemicals are used in fireworks?
a) Copper chloride
b) Calcium chloride
c) Barium chloride
d) All of above
Answer: d
5. What is the chemical reaction rate?
a) Chemical reaction rate is a chemical property
b) Chemical reaction rate is a physical property
c) Chemical reaction rate is an intensive property
d) Chemical reaction rate is an extensive property
Answer: c
6. The unit for rate of reaction for a fluid-solid catalytic reaction is _______
a) mol/m3.s
b) mol/s. g catalyst
c) mol/s. mmHg
d) mol/dm3.s
Answer: b
7. Chemical reaction rate is ___________
a) an extensive property
b) an intensive property
c) a chemical property
d) a physical property
Answer: b
8. –rA is a universal notation for reaction rate. What does the negative sign indicate?
a) Rate of formation of A
b) Rate of disappearance of A
c) Rate of dissociation of A
d) Rate of association of A
Answer: b
9. General mole balance equation of species ‘i’ at any instant is as follows: ________
a) Rate of moles of ‘i’ in = Rate of moles of ‘i’ out
b) Rate of moles of ‘i’ in + Rate of moles of ‘i’ out = Rate of moles of ‘i’ accumulated
c) Rate of moles of ‘i’ in + Rate of moles of ‘i’ accumulated = Rate of moles ‘i’ out
d) Rate of moles of ‘i’ in – Rate of moles of ‘i’ consumed by reaction – Rate of moles of ‘i’ out = Rate of moles of ‘i’ accumulated
Answer: d
10. In ________ there are no spatial variations in concentration and temperature.
a) PFR
b) Tubular reactor
c) CSTR
d) Packed bed reactor
Answer: c
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Balancing Equations Questions And Answers
11. The kinetic rate law is ______
a) a differential eqn
b) a linear eqn
c) an algebraic eqn
d) a quadratic eqn
Answer: c
12. Rate of gaseous phase reaction depends on __________
a) Temperature of reactants only
b) Pressure of reactants only
c) Concentration of reactants only
d) Temperature, Pressure and Concentration of reactants
Answer: d
13. The factors affecting the rate of homogeneous reaction are ____
a) Temperature only
b) Pressure only
c) Reactant Concentration only
d) Temperature, pressure and reactant concentration
Answer: d
14. The rate of a reaction cannot be expressed in terms of ____
a) Volume of reacting fluid
b) Volume of solid
c) Amount of product
d) Interfacial surface
Answer: c
15. Order of a reaction is ____
a) Number of molecules of reactants taking part in the reaction
b) Power of any one of the reactant concentrations
c) Concentration of intermediate species formed
d) Sum of the powers of the concentrations of all the reactants
Answer: d
16. The rate expression for a homogeneous reaction comprises ____
a) A concentration-dependent term only
b) A temperature-dependent term only
c) A concentration-dependent term and a temperature-dependent term
d) A catalyst weight dependent term
Answer: c
17. The number of molecules involved in an elementary reaction is termed as ____
a) Molecularity
b) Order of reaction
c) Unimolecular reaction
d) Rate of reaction
Answer: a
18. Which of the following is true about elementary reactions?
a) They occur in multiple steps
b) They are complex in nature
c) Order of elementary reaction is an integer
d) All first-order reactions are elementary
Answer: c
19. The study of rates at which chemical reactions occur and the effect of various parameters on the rate are termed as ____
a) Chemical Technology
b) Chemical Sciences
c) Chemical Kinetics
d) Fluid Mechanics
Answer: c
20. The rate of reaction is rapid for which of the following reactions?
a) Cellular reactions
b) Reactions in coal furnaces
c) Reactions in rocket engines
d) Gas reactions in porous catalysts
Answer: c
MCQ Questions for Class 10 Science
1. In writing chemical equations, the inclusion of state symbols shall be done while
a) Correct chemical formulae of reactants and products are written
b) The equation is being balanced to fulfill the law of conservation of mass
c) The equation has been balanced
d) The chemical formulae of products and reactants have been changed to bring about quick balancing
Answer: c
2. Consider equation: Pb⁺² (aq) + 2OH⁻ (aq) → Pb(OH)₂ (s). precipitate of lead (II) hydroxide will be of
a) Green color
b) Blue color
c) Brown color
d) White color
Answer: d
3. Consider equation: Cu⁺² (aq) + 2OH⁻(aq) → Cu(OH)₂ (s). precipitate of Copper Hydroxide (Cu(OH)₂) will be of
a) Green color
b) Blue color
c) Brown color
d) White color
Answer: b
4. Consider reaction: Na(s) + O₂(g) → Na₂O(s). Moles of sodium needed to balance equation would be
a) 1
b) 2
c) 3
d) 4
Answer: d
5. Consider reaction: S(s) + O₂(g) → SO₂. state of SO₂ in this reaction is
a) Liquid
b) Solid
c) Gaseous
d) All Three
Answer: c
6. An assumption of Steady State Approximation is ____
a) Reaction occurs without the formation of intermediates
b) Catalyst does not accelerate reaction rate
c) One of the intermediates in the reaction is consumed as quickly as it is generated
d) Equilibrium state is attained at the end of a reaction
Answer: c
7. The order of the reaction involving the conversion of ozone to oxygen is ____
a) Zero order
b) First order
c) Second order
d) Third order
Answer: b
8. At very low concentrations of azomethane, its decomposition follows which order?
a) First order
b) Zero order
c) Third order
d) Second order
Answer: d
9. Formation of hydrogen iodide from the corresponding elements is a ____
a) Single step mechanism
b) Two step mechanism
c) Three step mechanism
d) Four step mechanism
Answer: b
10. In the formation of phosgene from carbon monoxide and chlorine, which of the following is rate determining?
a) Decomposition of chlorine
b) Formation of COCl.
c) Reaction of COCl with Cl2
d) Decomposition of CO2
Answer: c
Class 10 Science Chapter 1 MCQ
11. Which of the following is true for gas phase reactions?
a) Increase in moles of product increases the volume of the reaction mixture
b) Increase in moles of product decreases the volume of the reaction mixture
c) Decrease in moles of product increases the volume of the reaction mixture
d) Increase in moles of product does not affect the volume of the reaction mixture
Answer: a
12. For an ideal gas at any given temperature and pressure, the ideal gas law is used to express ____
a) Concentration of gas molecules
b) Mobility of gas molecules
c) Kinetic energy of gas molecules
d) Potential energy of gas molecules
Answer: a
13. The progress of which among the following reactions results in an increase in volume?
a) A → B
b) 3A → B
c) A → 4B
d) 2A → B
Answer: c
14. For an endothermic reaction, the average energy of products is ____
a) Equal to the average energy of reactants
b) Lower than or equal to the average energy of reactants
c) Lower than the average energy of reactants
d) Greater than the average energy of reactants
Answer: d
15. Collision theory states that ____
a) Molecules do not collide during the reaction
b) Reactant molecules collide to effect product formation
c) Reactants form complexes
d) Products formed are unstable
Answer: b
16. A space velocity of 7 hr-1 means ___________
a) 7 reactor volumes of feed is fed into the reactor per hour
b) Feed is fed at 7 hrs interval
c) Takes 7 hours to treat one reactor volume of feed
d) Reaction time is 7 hours
Answer: a
17. A space time of 10 minutes means __________
a) 10 reactor volumes of feed is fed into the reactor per minute
b) Feed is fed at 10 mins interval
c) Takes 10 mins to treat one reactor volume of feed
d) Reaction time is 10 hrs
Answer: c
18. For a first order reaction, if the rate constant is 1 min-1 and the reaction time is 2 min, then the ratio of final to initial concentration is ____
a) 0.167
b) 0.135
c) 0.198
d) 0.764
Answer: b
19. A second order reaction occurs in a CSTR. Determine the ratio of volumes required for 45% conversion to 90% conversion, provided initial concentration, flow rate and other parameters are constant.
a) 1.64
b) 60.5
c) 0.35
d) 0.0165
Answer: b
20. A liquid phase reaction occurring in a CSTR follows first order dynamics. The feed rate is 500m3/min. Initial concentration of the feed is 50mol/m3. If the reaction conversion is 50% and the reaction is carried out in a 0.5 m3 CSTR, what is the value of rate constant?
a) 40
b) 20
c) 10
d) 5
Answer: b