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New Simplified Chemistry Class 8 ICSE Solutions. We covered all the New Simplified Chemistry Class 8 ICSE Solutions in this post for free so that you can practice well for the exam.
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New Simplified Chemistry Class 8 ICSE Objective Solutions for Students
What type of bonding is found in ferric chloride?
(a) Covalent
(b) Ionic
(c) Coordinate
(d) None of these
Option a – Covalent
Manganese reaches its maximum oxidation state in which compound?
(a) MnO2
(b) Mn2O4
(c) KMnO4
(d) K2MnO4
Option a – MnO2
What are the typical oxidation states of scandium (Atomic number 21)?
(a) +4
(b) +1
(c) +2 and +3
(d) +4 and +1
Option c – +2 and +3
In addition to zinc and copper, German silver also contains which element?
(a) Tin
(b) Silver
(c) Nickel
(d) Magnesium
Option c – Nickel
What is the correct chemical formula for permanganic acid?
(a) HMnO4
(b) HMnO5
(c) H2MnO4
(d) M2MnO3
Option a – HMnO4
Why is K2Cr2O7 preferred over Na2Cr2O7 as a primary standard in volumetric analysis?
(a) Na2Cr2O7 absorbs moisture while K2Cr2O7 does not
(b) K2Cr2O7 absorbs moisture while Na2Cr2O7 does not
(c) K2Cr2O7 is pure and Na2Cr2O7 is not
(d) None of these
Option a – Na2Cr2O7 absorbs moisture while K2Cr2O7 does not
Platinum dissolves in which of the following?
(a) Hot concentrated HNO3
(b) Hot concentrated HCl
(c) Hot dilute H2SO4
(d) Mixture of concentrated HCl and HNO3
Option d – Mixture of concentrated HCl and HNO3
Fusing MnO2 with KOH in the presence of air produces which colored compound?
(a) K2MnO4, dark green
(b) KMnO4, purple
(c) Mn2O3, brown
(d) Mn3O4, black
Option a – K2MnO4, dark green
Arrange Cu, Ag, and Au in decreasing order of melting points.
(a) Cu > Ag > Au
(b) Cu > Au > Ag
(c) Au > Ag > Cu
(d) Ag > Au > Cu
Option b – Cu > Au > Ag
Why don’t Group-12 elements (Zn, Cd, Hg) behave as transition metals?
(a) They act as superconductors
(b) They have high melting points
(c) Their d-subshells are fully filled
(d) They act as semiconductors
Option c – Their d-subshells are fully filled
Group-12 elements are softer than other d-block metals because
(a) Their structure is cage-like
(b) They have high ionization energies
(c) Both s and d electrons participate in bonding
(d) Their d electrons do not take part in metallic bonding
Option d – Their d electrons do not take part in metallic bonding
Which ore is used for extracting copper?
(a) Kupfernickel
(b) Dolomite
(c) Malachite
(d) Galena
Option c – Malachite
Choose the correct sequence of thermal stability.
(a) Zn > Hg > Cd
(b) Cd > Hg > Zn
(c) Zn > Cd > Hg
(d) Hg > Cd > Zn
Option c – Zn > Cd > Hg
Regular use of which fertilizer increases soil acidity?
(a) Ammonium sulfate
(b) Potassium nitrate
(c) Urea
(d) Superphosphate of lime
Option a – Ammonium sulfate
Which non-metal never shows a positive oxidation state?
(a) Chlorine
(b) Iodine
(c) Fluorine
(d) Oxygen
Option c – Fluorine
Which element forms the fewest oxyacids?
(a) Nitrogen
(b) Sulfur
(c) Fluorine
(d) Chlorine
Option c – Fluorine
Identify the incorrect formula for element X.
(a) X2Cl3
(b) X2O3
(c) X2(SO4)3
(d) XPO4
Option a – X2Cl3
Which of the following statements is not true?
(a) Cl2O7 is an anhydride of perchloric acid
(b) O3 has a bent molecular shape
(c) ONF is isoelectronic with NO2
(d) OF2 is an oxide of fluorine
Option d – OF2 is an oxide of fluorine
Choose the correct statement regarding acid strength.
(a) H3PO3 is more acidic than H2SO3
(b) HF is stronger than HCl in aqueous medium
(c) HClO4 is weaker than HClO3
(d) HNO3 is stronger than HNO2
Option d – HNO3 is stronger than HNO2
What is the hybridization and geometry of XeF4?
(a) Octahedral, sp3d2
(b) Trigonal bipyramidal, sp3d
(c) Trigonal planar, sp3d3
(d) Square planar, sp3d2
Option a – Octahedral, sp3d2
Which property is exclusive to either NO2 or SO2?
(a) Causes acid rain
(b) Acts as reducing agent
(c) Soluble in water
(d) Used as a food preservative
Option a – Causes acid rain
What is the correct order of bond dissociation energies for halogens?
(a) Cl2 > Br2 > F2 > I2
(b) Br2 > I2 > F2 > Cl2
(c) F2 > Cl2 > Br2 > I2
(d) I2 > Br2 > Cl2 > F2
Option a – Cl2 > Br2 > F2 > I2
Which reaction does NOT show the oxidizing property of concentrated H2SO4?
(a) Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O
(b) 3S + 2H2SO4 → 3SO2 + 2H2O
(c) C + 2H2SO4 → CO2 + 2SO2 + 2H2O
(d) CaF2 + H2SO4 → CaSO4 + 2HF
Option d – CaF2 + H2SO4 → CaSO4 + 2HF
A sharp rise in reaction rate with temperature suggests
(a) Increased collision frequency
(b) High activation energy
(c) High pre-exponential factor
(d) Increased molecular velocity
Option c – High pre-exponential factor
If activation energy is zero, then the rate constant
(a) Increases with temperature
(b) Depends on activation energy
(c) Is controlled by exponential factor
(d) Rises due to molecular speed
Option d – Rises due to molecular speed
Which statements align with collision theory?
(a) I, III, IV only
(b) II, IV only
(c) I, IV only
(d) I, II, III, IV
Option d – I, II, III, IV
Passing the same charge for 30 minutes deposits 0.375 g of Cu and 0.30 g of Cr. What is the electrochemical equivalent ratio of Cu to Cr?
(a) 0.8
(b) 1.25
(c) 2.5
(d) 1.62
Option b – 1.25
A galvanic cell is constructed using a 100 g zinc rod and 1.0 L of 1.0 M CuSO₄ solution. If it delivers a constant current of 1.0 A, for how long will the cell function? (Atomic mass of Zn = 65)
(A) 1.1 hr
(B) 46 hr
(C) 53.6 hr
(D) 24.00 hr
Option c – 53.6 hr
A molten metal salt is electrolyzed with a 2.0 A current for 5 hours, resulting in the deposition of 22.2 g of the metal. If the atomic mass of the metal is 177, what is its oxidation state?
(A) +1
(B) +2
(C) +3
(D) +4
Option c – +3
What quantity of charge must be passed through 200 mL of 0.5 M CuSO₄ to deposit all the copper?
(A) 96500 C
(B) 2 × 9650 C
(C) 2 × 96500 C
(D) 4 × 96500 C
Option b – 2 × 9650 C
The release of H₂ at the cathode and Cl₂ at the anode during electrolysis indicates that the electrolyte is ( New Simplified Chemistry Class 8 ICSE MCQ )
(A) Copper chloride in water
(B) NaCl in water
(C) Ferric chloride in water
(D) AuCl₃ in water
Option b – NaCl in water
When current flows through an electrolytic solution, positive ions go to the cathode and negative ions go to the anode. If the cathode is removed, what will happen?
(A) Both positive and negative ions will head toward the anode
(B) Positive ions move to the anode, and negative ions stop moving
(C) Negative ions continue to move toward the anode, while positive ions stop
(D) Both types of ions move randomly
Option d – Both types of ions move randomly
When 2.5 Faradays of charge is passed through CuSO₄, how many gram equivalents of copper are deposited? ( New Simplified Chemistry Class 8 ICSE MCQ )
(A) 1
(B) 2
(C) 2.5
(D) 1.25
Option c – 2.5
In an electrolytic cell with platinum electrodes and Ag₂SO₄ solution, how much silver is deposited if 1.6 g of oxygen is released at the anode?
(A) 107.88 g
(B) 1.6 g
(C) 0.8 g
(D) 21.60 g
Option d – 21.60 g
How much chlorine gas is produced when a 2 A current is passed for 30 minutes through an aqueous NaCl solution? ( New Simplified Chemistry Class 8 ICSE MCQ )
(A) 66 g
(B) 1.32 g
(C) 33 g
(D) 99 g
Option b – 1.32 g
What time is needed to deposit 1 millimole of aluminum by passing a current of 9.65 A through a solution containing Al³⁺?
(A) 30 s
(B) 10 s
(C) 30,000 s
(D) 10,000 s
Option a – 30 s
How many Coulombs are needed to convert 12.3 g of nitrobenzene into aniline?
(A) 579 C
(B) 5790 C
(C) 57900 C
(D) 579000 C
Option c – 57900 C
The amount of electricity required to deposit 108 g of silver from AgNO₃ solution is ( New Simplified Chemistry Class 8 ICSE MCQ )
(A) 1 ampere
(B) 1 Coulomb
(C) 1 Faraday
(D) 2 ampere
Option c – 1 Faraday
Passing 96500 C through CuSO₄ solution results in the liberation of
(A) 63.5 g of Cu
(B) 31.75 g of Cu
(C) 96500 g of Cu
(D) 100 g of Cu
Option b – 31.75 g of Cu
What is the charge equal to 0.05 Faraday? ( New Simplified Chemistry Class 8 ICSE MCQ )
(A) 48250 C
(B) 3776 C
(C) 4825 C
(D) 4285 C
Option c – 4825 C
If 3 Faradays are passed through molten Al₂O₃, aqueous CuSO₄, and molten NaCl in separate cells, what is the molar ratio of Al, Cu, and Na deposited? ( New Simplified Chemistry Class 8 ICSE MCQ )
(A) 1 mole : 2 mole : 3 mole
(B) 3 mole : 2 mole : 1 mole
(C) 1 mole : 1.5 mole : 3 mole
(D) 1.5 mole : 2 mole : 3 mole
Option c – 1 mole : 1.5 mole : 3 mole
When 1 Faraday of charge is passed through aqueous NiSO₄, the mass of nickel deposited at the cathode is ( New Simplified Chemistry Class 8 ICSE MCQ )
(A) 29.35 g
(B) 2.935 g
(C) 0.2935 g
(D) 293.5 g
Option a – 29.35 g
How can the lifespan of a Daniell cell be extended?
(A) By using a larger copper electrode
(B) By using a larger zinc electrode
(C) By reducing the temperature
(D) By lowering the concentration
Option d – By lowering the concentration
Daniel cell is classified as ( New Simplified Chemistry Class 8 ICSE MCQ )
(A) A reversible primary cell
(B) An irreversible primary cell
(C) An irreversible electrochemical cell
(D) A secondary type of cell
Option a – A reversible primary cell
In a Daniel cell, the reduction process occurs at the
(A) Positive terminal
(B) Negative terminal
(C) Zinc electrode
(D) Anode section
Option a – Positive terminal
Removing the salt bridge in a galvanic cell causes the voltage to
(A) Immediately drop to zero
(B) Remain unchanged
(C) Gradually increase
(D) Rise sharply
Option a – Immediately drop to zero
Which of the following is incorrect about a galvanic cell? ( New Simplified Chemistry Class 8 ICSE MCQ )
(A) Anode has a negative potential
(B) Cathode carries a positive charge
(C) Reduction takes place at the anode
(D) Reduction occurs at the cathode in the electrochemical system
Option c – Reduction takes place at the anode
The primary role of a salt bridge is to
(A) Allow ion migration between the two half-cells
(B) Connect both half-cells physically
(C) Ensure the e.m.f. stays positive
(D) Maintain electrical neutrality across the solutions
Option d – Maintain electrical neutrality across the solutions
During electrolysis, the number of ions generated is directly related to ( New Simplified Chemistry Class 8 ICSE MCQ )
(A) Duration of electrolysis
(B) Electrochemical equivalent value
(C) Total electric charge passed
(D) Mass of the involved electrons
Option c – Total electric charge passed
In a galvanic cell, the energy transformation is from
(A) Chemical form to electrical form
(B) Electrical energy to chemical form
(C) Chemical form to internal energy
(D) Internal energy to chemical energy
Option a – Chemical form to electrical form
A typical salt bridge includes
(A) Saturated KNO₃ with agar-agar
(B) Saturated KCl mixed with agar-agar
(C) Saturated NH₄NO₃ with agar-agar
(D) Any of the above options
Option d – Any of the above options
When writing a galvanic cell notation, ions in the same phase are separated by
(A) A single vertical bar
(B) Two vertical bars
(C) A comma
(D) A semicolon
Option c – A comma
During electrolysis of an aqueous sodium sulfate solution, the substance released at the cathode is ( New Simplified Chemistry Class 8 ICSE MCQ )
(A) Sodium
(B) Sulfur dioxide
(C) Sulfur trioxide
(D) Hydrogen
Option d – Hydrogen
When one end of a metal rod is heated, the other end becomes hot due to
(A) Movement of energized electrons
(B) Slight changes in atomic energy
(C) Electrical resistance of the metal
(D) Movement of metal atoms
Option a – Movement of energized electrons
Electrolysis of dilute sulfuric acid using platinum electrodes yields the following at the anode ( New Simplified Chemistry Class 8 ICSE MCQ )
(A) Hydrogen gas
(B) Oxygen gas
(C) Hydrogen sulfide
(D) Sulfur dioxide
Option b – Oxygen gas
Among the following, which KCl solution exhibits the greatest specific conductivity?
(A) 0.01 M
(B) 0.1 M
(C) 1.0 M
(D) 0.5 M
Option c – 1.0 M
The rise in equivalent conductance of a strong electrolyte upon dilution is largely because ( New Simplified Chemistry Class 8 ICSE MCQ )
(A) The ionic mobility of the ions increases
(B) Electrolyte is completely ionized under normal dilution
(C) Both the number of ions and their mobility increase
(D) More ions are formed
Option a – The ionic mobility of the ions increases
In the electrolysis of acidified water, the volume ratio of hydrogen to oxygen evolved is
(A) 2 : 1
(B) 1 : 2
(C) 8 : 1
(D) 1 : 8
Option a – 2 : 1
According to Kohlrausch’s law, at infinite dilution ( New Simplified Chemistry Class 8 ICSE MCQ )
(A) Each ion contributes independently to the conductance of the electrolyte regardless of the other ion
(B) Each ion contributes a definite value to the equivalent conductance regardless of the other ion
(C) Each ion’s contribution to equivalent conductance depends on the nature of the counter-ion
(D) Conductance depends on both ions even at infinite dilution
Option a – Each ion contributes independently to the conductance of the electrolyte regardless of the other ion
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