CBSE Class 12 Chemistry Quiz | CBSE Class 12 Chemistry Objective Type Questions with Answers

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Questions
121 Which one of the following metals is required as cofactor by all enzymes utilizing ATP in phosphate transfer?
A Mg
B He
C K
D Ca

Answer: Mg
122 Which of the following polymer is stored in the liver of animals?
A Glycogen
B Amylopectin
C Amylose
D Cellulose

Answer: slope of velocity-time graph
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123 Which of the following acids is a vitamin?
A Ascorbic acid
B Adipic acid
C Aspartic acid
D Saccharic acid

Answer: Ascorbic acid
124 Each polypeptide in a protein has aminoacids linked with each other in a specific sequence. This sequence of amino acids is said to be __________ .
A primary structure of proteins.
B secondary structure of proteins.
C tertiary structure of proteins.
D quaternary structure of proteins.

Answer: primary structure of proteins.
125 Which of the following reactions of glucose can be explained only by its cyclic structure? [NCERT Exemplar]
A Pentaacetate of glucose does not react with hydroxylamine.
B Glucose is oxidised by nitric acid to gluconic acid.
C Glucose forms pentaacetate.
D Glucose reacts with hydroxylamine to form an oxime.

Answer: Pentaacetate of glucose does not react with hydroxylamine.
126 The sugar present in milk is
A lactose
B Glucose
C Sucrose
D Maltose

Answer: lactose
127 Which of the following has magnesium?
A Vitamin B12
B Chlorophll
C Haemocyanin
D Carbonic anhydrate

Answer: Chlorophll
128 Trunbull’s blue is
A Ferrous ferricyanide
B Fe3[Fe(CN)6]4
C Ferrous cyanide
D Ferricyanide

Answer: Ferrous ferricyanide
129 Among the ligands NH3, en, CN and CO, the correct order of field strength is
A NH3 < en < CN– < CO
B CN– < NH3 < CO < en
C en < CN–< NH3 < CO
D CO < NH3 < en < CN–

Answer: NH3 < en < CN– < CO
130 Transistion metals, despite high E° oxidation, are poor reducing agents. The incorrect reason is
A complex forming nature.
B low heats of hydration.
C high ionization energies.
D high heat of vaporization.

Answer: complex forming nature.
131 Which of the following is incorrect for KMnO4 to be used as an oxidising agent?
A The number of electrons involved in oxidation of KMnO4 in acidic medium is 3.
B The equivalent weight of KMnO4 in basic medium is 158.
C Nitric acid is not used for the above purpose because it itself acts as a self oxidising agent and will react with the reducing agent.
D HCl cannot be used because some KMnO4 is consumed in the reaction.

Answer: The number of electrons involved in oxidation of KMnO4 in acidic medium is 3.
132 The property which is not characteristic of transistion metals is
A natural radioactivity.
B formation of coloured compounds.
C tendency to form complexes.
D variable oxidation states.

Answer: natural radioactivity.
133 Which one of the following characteristics of the transistion metals is associated with higher catalytic activity?
A Colour of hydrate ions
B Variable oxidation states
C Paramagnetic behaviour
D High enthalpy of atomisation

Answer: Variable oxidation states
134 Which of the following are d-block elements but not regarded as transistion elements?
A Zn, Cd, Hg
B Ru, Rh, Pd
C Fe, Co, Ni
D Cu, Ag, Au

Answer: Zn, Cd, Hg
135 Anomalous electronic configuration in the 3d series are of
A Cr and Cu
B Fe and Cu
C Cr and Fe
D Cu and Zn

Answer: Cr and Cu
136 The increasing order of reducing power of the halogen acids is
A HF < HCl < HBr < HI
B HCl < HBr < HF < HI
C HI < HBr < HCl < HF
D HBr < HCl < HF < HI

Answer: HF < HCl < HBr < HI
137 Helium is preferred to be used in balloons instead of hydrogen because it is
A incombustible
B non polarizable
C lighter than hydrogen
D more abundant than hydrogen

Answer: incombustible
138 H2S is more acidic than H2O because
A oxygen is more electronegative than sulphur.
B atomic number of sulphur is higher than oxygen.
C H — S bond dissociation energy is less as compared to H — O bond.
D H — O bond dissociation energy is less also compared to H — S bond.

Answer: atomic number of sulphur is higher than oxygen.
139 When Cl2 reacts with hot and cone. NaOH, the oxidation number of chlorine changes from
A zero to +1 and zero to +5
B 0 to -1 and 0 to +5
C zero to -1 and zero to +3
D 0 to +1 and 0 to -3

Answer: 0 to -1 and 0 to +5
140 Fluorine differs from rest of the halogens in some of its properties. This is due to
A its smaller size and high electronegativity.
B lack of d-orbitals.
C low bond dissociation energy.
D All of the these.

Answer: lack of d-orbitals.

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