Important Chemical Reactions and Processes CDS Questions

CDS Chemistry

Important Chemical Reactions and Processes MCQ Questions


1.
In terms of the classical, oxygen-based definition, oxidation refers to a process in which a substance:
A.
Gains oxygen (or, equivalently, loses hydrogen)
B.
Gains both oxygen and hydrogen simultaneously, in every single reaction
C.
Loses oxygen (or, equivalently, gains hydrogen)
D.
Neither gains nor loses any oxygen or hydrogen under any circumstances
😑 View Answer Rough Work Error
ANSWER :
A. Gains oxygen (or, equivalently, loses hydrogen)
2.
In terms of the classical, oxygen-based definition, reduction refers to a process in which a substance:
A.
Loses oxygen (or, equivalently, gains hydrogen)
B.
Loses both oxygen and hydrogen simultaneously, in every single reaction
C.
Gains oxygen (or, equivalently, loses hydrogen)
D.
Neither gains nor loses any oxygen or hydrogen under any circumstances
😑 View Answer Rough Work Error
ANSWER :
A. Loses oxygen (or, equivalently, gains hydrogen)
3.
In the classic NCERT reaction between copper(II) oxide and hydrogen gas (CuO + H₂ → Cu + H₂O, on heating), which substance is OXIDISED?
A.
Copper(II) oxide (CuO), since it gains hydrogen
B.
Hydrogen (Hâ‚‚), since it gains oxygen to form water
C.
Copper (Cu), the final metallic product of the reaction
D.
Neither substance undergoes any oxidation in this particular reaction
😑 View Answer Rough Work Error
ANSWER :
B. Hydrogen (Hâ‚‚), since it gains oxygen to form water
4.
In the same classic reaction (CuO + H₂ → Cu + H₂O), which substance acts as the REDUCING AGENT (the substance that itself undergoes oxidation, thereby enabling the reduction of the other substance)?
A.
Copper(II) oxide (CuO)
B.
Hydrogen (Hâ‚‚)
C.
Copper (Cu)
D.
Water (Hâ‚‚O)
😑 View Answer Rough Work Error
ANSWER :
B. Hydrogen (Hâ‚‚)
5.
In the same classic reaction (CuO + H₂ → Cu + H₂O), which substance acts as the OXIDISING AGENT (the substance that itself undergoes reduction, thereby enabling the oxidation of the other substance)?
A.
Hydrogen (Hâ‚‚)
B.
Copper(II) oxide (CuO)
C.
Water (Hâ‚‚O)
D.
Copper (Cu)
😑 View Answer Rough Work Error
ANSWER :
B. Copper(II) oxide (CuO)
6.
According to the modern, electron-transfer-based definition of oxidation and reduction, oxidation refers to a process in which a substance (atom, molecule, or ion):
A.
Gains an equal number of both electrons and protons simultaneously
B.
Loses one or more electrons
C.
Gains one or more electrons
D.
Neither loses nor gains any electrons under any circumstances
😑 View Answer Rough Work Error
ANSWER :
B. Loses one or more electrons