chemistry MCQs – Page 17

Practise multiple-choice questions from chemistry for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemistry Mcqs
321. In a period the atomic radius ?
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A. Remain same

B. Decreases

C. Increases

D. First decreases then increases

322. Milikan used ______________ in his atomizer?
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A. Milk

B. Honey

C. Water

D. Oil
323. Rising of a wetting liquid in a capillary tube is due to__________________?
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A. Cohesive forces

B. Surface tension

C. viscosity

D. Adhesive forces
324. Which one of the following explain the shape of orbitals _________________?
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A. Spin quantum number

B. Principal of quantum number

C. Magnetic quantum number

D. Azimuthal quantum number
325. Octane number can be improved by________________?
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A. All

B. Isomerization

C. Adding (CH3)4 Pb

D. Adding (C2H5)4 Pb

326. Rate of filtration can be increased by applying gentle suction______________?
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A. Gooch crucible

B. Filter paper

C. Sintered crucible

D. All of the above

327. Charge of electron was measured by__________________?
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A. Perrin

B. Rutherford

C. J.J Thomson

D. Millikan
328. One mole of an ideal gas at 546.5 K under 2 atm pressure has a volume of________________?
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A. 44.828 dm3

B. 22.414 m3

C. 22.414 dm3

D. 11.212 cm3

329. Silica gel and alumina are used as __________________?
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A. Mixed phase

B. Single phase

C. Stationary phase

D. Mobile phase

330. Which solids are called true solids _______________?
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A. Amorphous

B. Vitreous

C. Crystalline

D. Metallic

331. The ttractive forces between the partial positive end of one molecule and partial negative end of other molecule are called________________?
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A. London dispersion forces

B. Ion dipole-dipole forces

C. Dipole-dipole forces

D. Debye forces

332. Sharing of 1 electron pair by one specie forms_________________?
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A. Single covalent bond

B. Double covalent bond

C. Coordinate covalent bond

D. Hydrogen bond

333. Molar heat of vaporization of water is_________________?
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A. 40.7 cal/mole

B. 40.7 J/mole

C. 40.7 KJ/mole

D. 40.7 Kcal/mole

334. Crystallites are present in_________________?
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A. liquid crystals

B. amorphous solids

C. all of the above

D. crystalline solids

335. Octane number 2 2 4-trimethyl pentane is________________?
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A. 70

B. 80

C. 90

D. 100
336. Which one of the following is a state function ________________?
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A. temperature

B. pressure

C. enthalpy

D. all of the above
337. The atomic number of an element having maximum number of unpaired electrons in p-subshell is_______________?
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A. 10

B. 12

C. 7

D. 16

338. Ideal gasses have all the following characteristics except ?
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A. The molecules occupy no space

B. All of the above are correct

C. Absence of intermolecular forces

D. Collisions among the molecules of an ideal gas are perfectly elastic

339. The weakest (in strength) of the following intermolecular forces is_______________?
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A. Vander Waals force

B. Ionic bond

C. Hydrogen bonding

D. Forces among the polar molecules

340. Bond order for N2 molecule is __________________?
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A. 2

B. 4

C. 1

D. 3