A) sp3
Explanation:Water (H₂O) has two lone pairs on oxygen, leading to a bent shape.
The hybridization is sp³ (4 electron domains around oxygen).
Answer:sp³
112)Which among the following theories explained both shape and strength of the bond in covalent compounds?
A) Electronic theory of valence
B) Valence shell electron pair repulsion theory
C) Valence bond theory
D) All of the above
View Answer
C) Valence bond theory
Explanation:Valence Bond Theory (VBT) explains both bond strength and shape via orbital overlap.
Answer:Valence bond theory
113)Highest abundant metal in earth’s crust is
A) Al
B) Au
C) N2
D) Fe
View Answer
A) Al
Explanation:The most abundant metal in Earth’s crust is aluminium (Al).
Answer:Al
114)Which of the following is not a sulphide ore?
A) Pyrolusite
B) Galena
C) Cinnabar
D) Copper iron pyrites
View Answer
A) Pyrolusite
Explanation:Pyrolusite (MnO₂) is an oxide ore, not a sulphide.
Answer:Pyrolusite
115)Which of the following ores undergoes roasting?
A) Carbonate ores
B) Oxide ores
C) Sulphide ores
D) All of these
View Answer
C) Sulphide ores
Explanation:Roasting is mainly used for sulphide ores, converting them into oxides.
Answer:Sulphide ores
116)Which of the following metals liberates H2 on reaction with steam but not with cold water?
A) Pb
B) Na
C) Fe
D) K
View Answer
C) Fe
Explanation:Iron (Fe) reacts with steam, but not with cold water, producing H₂ gas.
Answer:Fe
117)The numbers of sigma (σ) and pi (π) bonds in C2H2 molecule is
A) 3 sigma and zero pi
B) 3 sigma and 2 pi
C) 2 sigma and 3 pi
D) 4 sigma and 1 pi
View Answer
B) 3 sigma and 2 pi
Explanation:In ethyne (C₂H₂):
Each carbon forms 1 σ-bond with H and 1 σ-bond between C–CBetween C≡C, 1 σ + 2 π bonds
→ Total: 3 σ and 2 π bonds
Answer:3 sigma and 2 pi
118)Which of the following is not a conductor?
A) Graphite
B) Carbon nanotubes
C) Diamond
D) All of these
View Answer
C) Diamond
Explanation:Diamond is a poor conductor (all electrons are bonded), unlike graphite and nanotubes.
Answer:Diamond
119)Which of the following is an unsaturated hydrocarbon?
A) Butane
B) Butyne
C) Isobutane
D) Cyclobutane
View Answer
B) Butyne
Explanation:Butyne contains a triple bond ⇒ unsaturated hydrocarbon.
Answer:Butyne
120)What does an oxidizing agent do?
A) It reduces other substance and itself undergoes oxidation
B) It reduces other substance and itself undergoes reduction
C) It oxidizes other substance and itself undergoes oxidation
D) It oxidizes other substance and itself undergoes reduction
View Answer
D) It oxidizes other substance and itself undergoes reduction
Explanation:An oxidizing agent causes oxidation of another substance and itself gets reduced.
Answer:It oxidizes other substance and itself undergoes reduction
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