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Quiz 66
Mdcat-past-papers - UHS Quiz
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Board: UHS |
1301. Which of the following is NOT a feature of Valence Shell Electron Pair Repulsion theory?
It determines the shape of molecule
Pairs of electrons repel each other
It helps in understanding interaction of medicinal drug molecules
Only lone pairs participate in determining geometry of molecules
1302. The paramagnetic character of a substance is due to:
Bond pair of electrons
Lone pair of electrons
Unpaired electrons in atom or molecule
Paired electrons in valence shells of electrons
1303. When the two partially filled atomic orbitals overlap in such a way that the probability of finding electron is maximum around the line joining the two nuclei, the result is the formation of:
Sigma bond
Pi bond
Hydrogen bond
Metallic bond
1304. Which option shows all the molecules with bond angle 109.5°?
CH₄, NH₄⁺, PH₃
SiCl₄, H₂O, BeCl₂
SiCl₄, NH₄⁺, CH₄
CH₄, CCl₄, NH₃
1305. Which one of the following molecules has sp³ hybridization?
CH₄
C₂H₂
CO₂
C₂H₄
1306. Which one of the following hydrogen bonds is stronger than others?
Nδ-–Hδ⁺ ……………….. Nδ-–Hδ⁺
Oδ–Hδ⁺ ………………… Oδ–Hδ⁺
Fδ- –Hδ⁺ …………………Fδ- –Hδ⁺
Nδ–Hδ⁺ ………………… Oδ–Hδ⁺
1307. The average bond energy of C–Br is:
228 kJ mol⁻¹
200 kJ mol⁻¹
250 kJ mol⁻¹
290 kJ mol⁻¹
1308. Which of the following sets constitutes all the molecules and ions of non-planar geometry?
PH₃, benzene, SO₃, BeCl₂, H₂S
CH≡CH, CH, H₂O, BeCl₂, H₂S
SO₂, C₂H₄, NF₃, NO₃⁻
CH₄, NH₄⁺, MnO₄⁻, NF₃
1309. The bond energy of hydrogen in H₂ molecule is:
242 kJ/mol
431 kJ/mol
436 kJ/mol
346 kJ/mol
1310. Reactants have high energy than products in:
Exothermic Reaction
Endothermic reaction
Photochemical
Non-Spontaneous
1311. Which of the following is a state function?
Freezing
Decomposition
Sublimation
Enthalpy
1312. The rate of reaction between two specific time intervals is called:
Instantaneous rate of reaction
Average rate of reaction
Initial rate
Beginning reaction
1313. How will be the rate of reaction, if the slope of the curve is greater near the start of the reaction?
Constant
Greater
Equilibrium
Lesser
1314. What is the reason for energy changes in a chemical reaction?
Bond formation
Bond breakage
Bond formation & breakage
Ionic bonds
1315. In endothermic reaction, the heat content of the:
Reactants and products are equal
Reactants is more than that of products
Products is more than that of reactants
Reactants & products will not change
1316. Liquid in the container has temperature 70°C. What will be the temperature in kelvin scale?
350 K
343 K
300 K
283 K
1317. What is the unit of heat capacity?
J•K⁻¹
kJ/K
kJ•mol⁻¹
kJ•mol
1318. In standard enthalpy of atomization, heat of surrounding:
Remains unchanged
Increases
Increases then decreases
Decreases
1319. ΔH will be given a negative sign in:
Exothermic reaction
Dissociation reaction
Decomposition reaction
Endothermic reaction
1320. Lattice energy of an ionic crystal is the enthalpy of:
Combustion
Dissociation
Dissolution
Formation
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