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New Simplified Chemistry Class 8 ICSE Objective Solutions for Students
Quick Quiz
Bonding in ferric chloride is
(A) covalent
(B) ionic
(C) coordinate
(D) none of these
Option a – covalent
Manganese achieves its highest oxidation state in its compound
(A) MnO2
(B) Mn2O4
(C) KMnO4
(D) K₂MnO4
Option a – MnO2
The common oxidation state of scandium, a transition element, is/are (At. No. of Sc = 21)
(A) +4
(B) +1
(C) +2 and +3
(D) +4 and +1
Option c – +2 and +3
Besides Zn and Cu, German silver contains the metal
(A) Sn
(B) Ag
(C) Ni
(D) Mg
Option c – Ni
The correct formula of permanganic acid is
(A) HMnO4
(B) HMnO5
(C) H₂MnO4
(D) M₂MnO3
Option a – HMnO4
K2Cr207 is preferred to Na2Cr207 for use in volumetric analysis as a primary standard because
(A) Na2Cr2O7 is hygroscopic while K2Cr207 is not
(B) K2Cr2O7 is hygroscopic while Na2Cr207 is not
(C) K2Cr2O7 is pure while Na2Cr207 is impure
(D) None of these
Option a – Na2Cr2O7 is hygroscopic while K2Cr207 is not
Platinum metal can be dissolved in
(A) Hot conc. HNO3
(B) Hot conc. HCI
(C) Hot dilute H2SO4
(D) A mixture of conc. HCl and HNO3
Option d – A mixture of conc. HCl and HNO3
When MnO2 is fused with KOH in the presence of air, a colored compound is formed, and the product and its color is
(A) K₂MnO4, dark green
(B) KMnO4 purple
(C) Mn2O3, brown
(D) Mn3O4, black
Option a – K₂MnO4, dark green
The melting points of Cu, Ag, and Au follow the order
(A) Cu > Ag > Au
(B) Cu > Au > Ag
(C) Au > Ag > Cu
(D) Ag > Au > Cu
Option b – Cu > Au > Ag
The ions of metals of Group-12 (Zn, Cd, and Hg) have a completed shell, so
(A) behave like superconductors
(B) are very high melting solids
(C) do not behave like transition metals
(D) behave like semiconductors
Option c – do not behave like transition metals
The metals of Group-12 are softer than other transition metals because
(A) Group-12 metals have a cage-like structure
(B) Group-12 metals have high ionization energies
(C) s- as well as d-electrons, take part in metallic bonding
(D) d-electrons do not take part in metallic bonding
Option d – d-electrons do not take part in metallic bonding
Copper can be extracted from
(A) kupfemickel
(B) dolomite
(C) malachite
(D) galena
Option c – malachite
Which of the following is arranged in order of decreasing 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 the following fertilizers increases the acidity of the soil.
(A) Ammonium sulfate
(B) Potassium nitrate
(C) Urea
(D) Superphosphate of lime
Option a – Ammonium sulfate
The non-metals that do not exhibit a positive oxidation state are
(A) chlorine
(B) iodine
(C) fluorine
(D) Oxygen
Option c – fluorine
The least number of oxyacids are formed by
(A) nitrogen
(B) sulfur
(C) fluorine
(D) chlorine
Option c – fluorine
Choose the incorrect formula out of the four compounds for an element X given below.
(A) X₂Cl3
(B) X₂O3
(C) X2(SO4)3
(D) XPO4
Option a – X₂Cl3
Which of the statements given below is incorrect?
(A) Cl₂O7 is an anhydride and the perchloric acid
(B) The O3 molecule is bent.
(C) ONF is isoelectronic with NO2
(D) OF2 is an oxide of fluorine
Option d – OF2 is an oxide of fluorine
Which of the following statements is true?
(A) H3PO3 is a stronger acid than H₂SO3
(B) In an aqueous medium HF is a stronger acid than HCI.
(C) HCIO4 is a weaker acid than HClO3.
(D) HNO3 is a stronger acid than HNO2.
Option d – HNO3 is a stronger acid than HNO2
The correct geometry and hybridization for XeF4 are
(A) Octahedral, sp³d²
(B) Trigonal bipyramidal, sp³d
(C) Planar triangle, sp³d³
(D) Square planar, sp³d²
Option a – Octahedral, sp³d²
Nitrogen dioxide and sulfur dioxide have some properties in common. Which property is shown by one of these compounds, but not by the other?
(A) Forms acid rain
(B) Is a reducing agent.
(C) Is soluble in water
(D) Is used as food-preservative
Option a – Forms acid rain
Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?
(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
Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reaction does not show oxidizing behavior?
(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 large increase in the rate constant with a small rise in temperature for a gaseous reaction is indicative of
(A) a Large number of collisions at higher temperatures.
(B) The high value of activation energy of the reaction.
(C) The high value of the pre-exponential factor.
(D) Increase in the average speed of the molecules.
Option c – The high value of the pre-exponential factor
The activation energy of a reaction is zero. The rate constant of the reaction
(A) Increases with an increase in temperature.
(B) The high value of activation energy of the reaction.
(C) The high value of the exponential for
(D) Increase in the average speed of the molecules.
Option d – Increase in the average speed of the molecules
Pick the appropriate choice about the collision theory of reaction rates. I) It explains the effect of temperature on rate! of reaction. II) It assumes that the reactants must be in the correct orientation to react. III) It says the rate depends upon the frequency at which reactants collide. IV) The collisions having energy higher than the threshold value give successful reactions. The correct options are
(A) I, III, IV
(B) II, IV
(C) I, IV
(D) I, II, III, IV
Option d – I, II, III, IV
When the same quantity of electricity is passed for half an hour, the amount of Cu and Cr deposited are respectively 0.375 g and 0.30 g. The ratio of electrochemical equivalents of Cu and Cr is
(A) 0.8
(B) 1.25
(C) 2.5
(D) 1.62
Option b – 1.25
A galvanic cell is set up from a zinc bar weighing 100 g and 1.0 liter of 1.0 M CuSO4 solution. How long would the cell run if it’s assumed to deliver a steady current of 1.0 amp? (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 current of 2.0 A passed for 5 hours through a molten metal salt and deposits 22.2 g of metal (Atomic weight= 177) The oxidation state of the metal salt is
(A) +1
(B) +2
(C) +3
(D) +4
Option c – +3
How much quantity of electricity has to be passed through 200 ml of 0.5 M CuSO4 solution to completely deposit copper?
(A) 96500 C
(B) 2 × 9650 C
(C) 2 x 96500 C
(D) 4 x 96500 C
Option b – 2 × 9650 C
The passage of current liberate H2 at the cathode and Cl2 at the anode. The solution is
(A) Copper chloride in water
(B) NaCl in water
(C) Ferric chloride in water
(D) AuCl3 in water
Option b – NaCl in water
When an electric current is passed through a cell having an electrolyte, the positive ions move toward the cathode and the negative ions toward the anode. If the cathode is pulled out of the solution
(A) The positive and negative ions will move toward the anode.
(B) The positive ions will start moving toward the anode, and the negative ions will stop moving.
(C) The negative ions will continue to move toward the anode, and the positive ions will stop moving.
(D) The positive and negative ions will start moving randomly.
Option d – The positive and negative ions will start moving randomly
2.5 Faradays of electricity is passed through a solution of CuSO4. The number of gram equivalents of copper deposited on the cathode would be
(A) 1
(B) 2
(C) 2.5
(D) 1.25
Option c – 2.5
An electrolytic cell contains a solution of Ag2SO4 and has pt. electrodes. A current is passed till 1.6 g of O2 has been liberated at the anode. The amount of silver deposited at the cathode will be
(A) 107.88 g
(B) 1.6 g
(C) 0.8 g
(D) 21.60 g
Option d – 21.60 g
What is the amount of chlorine evolved when 2 amperes of current is passed for 30 minutes in an aqueous solution of NaCl?
(A) 66 g
(B) 1.32 g
(C) 33 g
(D) 99 g
Option b – 1.32 g
The time required to deposit one milli mole of aluminum metal by the passage of 9.65 amperes through an aqueous solution of aluminum ion is
(A) 30 s
(B) 10 s
(C) 30,000 s
(D) 10,000 s
Option a – 30 s
How many Coulombs are required in order to reduce 12.3 g of nitrobenzene to aniline?
(A) 579 C
(B) 5790 C
(C) 57900 C
(D) 579000 C
Option c – 57900 C
The amount of electricity that can deposit 108 g of silver from silver nitrate solution is
(A) 1 ampere
(B) 1 Coulomb
(C) 1 Faraday
(D) 2 ampere
Option c – 1 Faraday
96500 C of electricity liberates from the CuSO4 solution
(A) 63.5 g of Cu
(B) 31.75 of Cu
(C) 96500 of Cu
(D) 100 g of Cu
Option b – 31.75 of Cu
The amount of electricity equal to 0.05 F is
(A) 48250 C
(B) 3776 C
(C) 4825 C
(D) 4285 C
Option c – 4825 C
Three Faraday of electricity is passed through molten Al2O3 aqueous solution of CuSO4 and molten NaCl taken in different electrolytic cells. The amount of Al, Cu, and Na deposited at the cathode will be in the ratio of
(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
On passing 1 F electricity from an aq. solution NiSO4 weight of Ni deposited on the cathode is
(A) 29.35 g
(B) 2.935 g
(C) 0.2935 g
(D) 293.5 g
Option a – 29.35 g
The life span of Daniel’s cell may be increased by
(A) a Larger Cu electrode
(B) a Larger Zn electrode
(C) Lowering the temperature
(D) Lowering the concentration
Option d – Lowering the concentration
Daniel cell is
(A) Primary reversible cell
(B) Primary irreversible cell
(C) Irreversible cell
(D) Secondary cell
Option a – Primary reversible cell
In the Daniel cell, reduction occurs at the
(A) Positive electrode
(B) Negative electrode
(C) Zinc rod
(D) Anode
Option a – Positive electrode
If a salt bridge is removed between the two half cells the voltage
(A) Drops to zero
(B) Does not change
(C) Increases gradually
(D) Increases rapidly
Option a – Drops to zero
In a galvanic cell, which one of the following is wrong?
(A) Anode is negatively charged.
(B) The cathode is positively charged.
(C) Reduction takes place at the anode
(D) Reduction takes place at the cathode of an electrochemical cell.
Option c – Reduction takes place at the anode
The main function of the salt bridge is
(A) To allow ions to go from one cell to another.
(B) To provide a link between two half-cells.
(C) To keep the e.m.f. of the cell positive.
(D) To maintain the electrical neutrality of the solution in two half-cells.
Option d – To maintain the electrical neutrality of the solution in two half-cells
During the electrolysis of an electrolyte the number! of ions produced is directly proportional to the
(A) Time consumed
(B) Electrochemical equivalent
(C) Quantity of electricity passed
(D) Mass of electrons
Option c – Quantity of electricity passed
In a galvanic cell energy changes occurs as
(A) Chemical energy → Electrical energy
(B) Electrical energy → Chemical energy
(C) Chemical energy → Internal energy
(D) Internal energy → Chemical energy
Option a – Chemical energy → Electrical energy
A salt bridge contains
(A) A saturated solution of KNO3 agar-agar
(B) A saturated solution of KCl and agar-agar
(C) A saturated solution of NH4NO3 and agar-agar
(D) All of these
Option d – All of these
In the representation of a galvanic cell, the ions in the same phase are separated by an
(A) Single vertical line
(B) Double vertical line
(C) Comma
(D) Semicolon
Option c – Comma
In the electrolysis of an aqueous solution of sodium sulfate on a cathode, we get
(A) Na
(B) SO2
(C) SO3
(D) H2
Option d – H2
On heating one end of a piece of metal, the other end becomes hot because of
(A) Energized electrons moving to the other end
(B) Minor perturbation in the energy of atoms
(C) Resistance of the metal
(D) Mobility of atoms in the metal.
Option a – Energized electrons moving to the other end
On electrolysis, of dilute sulphuric acid using platinum electrodes, the product obtained at the anode will be
(A) Hydrogen
(B) Oxygen
(C) Hydrogen sulfide
(D) Sulpher dioxide
Option b – Oxygen
Which of the following solutions of KCl will have the highest value of specific conductance?
(A) 0.01 M
(B) 0.1 M
(C) 1.0 M
(D) 0.5 M
Option c – 1.0 M
An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to
(A) an Increase in ionic mobility of ions
(B) 100% ionization of electrolyte at normal dilution.
(C) Increase in both i.e., number of ions and ionic mobility of ions.
(D) Increase in the number of ions.
Option a – an Increase in ionic mobility of ions
What is the ratio of volumes of H2 and O2 liberated during the electrolysis of acidified water?
(A) 2 : 1
(B) 1 : 2
(C) 8 : 1
(D) 1 : 8
Option a – 2 : 1
Kohlrausch’s law states that at
(A) At infinite dilution, each ion makes a definite contribution to the conductance of an electrolyte, whatever the nature of the other ion of the electrolyte.
(B) Infinite dilution, each ion makes a definite contribution to the equivalent conductance of an electrolyte, whatever the nature of the other ion of the electrolyte.
(C) Infinite dilution, each ion makes a definite contribution to the equivalent conductance of an electrolyte depending on the nature of the other ion of the electrolyte.
(D) Infinite dilution each ion makes a definite contribution to the equivalent conductance of an electrolyte depending on the nature of the other ion of the electrolyte.
Option a – At infinite dilution, each ion makes a definite contribution to the conductance of an electrolyte, whatever the nature of the other ion of the electrolyte
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