chemistry MCQs – Page 18

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 Review each marked answer and report any item that may be outdated or unclear.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
341. Which one is false for evaporation ?
comments icon0
A. Exothermic

B. Surface phenomenon

C. Cause cooling

D. Continuous

342. Which of these gases diffuse more quickly than oxygen ?
comments icon0

A. Cl2

B. N2O

C. NO

D. H2S

343. The solid particles only posses_____________________?
comments icon0
A. Vibrational motion

B. Translational motion

C. All of above motions

D. Rotational motion

344. The maximum number of orbitals present in a subshell that is represented by Azimuthal quantum number = 3 will be________________?
comments icon0

A. 5

B. 7

C. 3

D. 1

345. In crystallization if the solvent is inflammable then direct heating is________________?
comments icon0

A. crystallization does not involve heating

B. depends on temperature

C. avoided

D. needed

346. A substance having very high vapour pressure at its melting point on heating will show_______________?
comments icon0

A. Melting

B. Decomposition

C. Sublimation

D. Condensation

347. The partial pressure exerted by the water vapours is called_______________?
comments icon0

A. Hydraulic pressure

B. Aqueous tension

C. Vapour pressure

D. Surface tension

348. Pressure in gas discharge tube was kept________________?
comments icon0
A. 0.01 torr

B. 10 torr

C. 1 torr

D. 0.1 torr

349. Enthalpy change can be_________________?
comments icon0

A. calculated by Hess law

B. can be measured by calorimeter

C. both A and B

D. none

350. Reaction in which heat evolves is called ____________________?
comments icon0

A. spontaneous

B. endothermic

C. exothermic

D. non-spontaneous

351. When substance moves from a solid to a liquid state all of the following changes occur except__________________?
comments icon0

A. Intermolecular forces become weaker

B. Molecule become further separated

C. K.E of the molecules decreases

D. Molecules become more disordered

352. Which of the following way in used for classification of chromatography ?
comments icon0

A. Phase

B. Shape

C. Mechanism

D. All
353. Fluted filter paper is used to__________________?
comments icon0

A. Filter hot solution

B. Increase the rate of filtration

C. Avoid premature crystallization

D. Decrease the area

354. Which one is the right value for R ?
comments icon0

A. 2 cal k-1 mol-1

B. 0.0821 atm m3k-1mol-1

C. 0.0821 atm dm3k-1mol-

D. 8.314 Nm2k-1mol-1

355. Mostly ionic compound are produced in between elements of_________________?
comments icon0

A. IA and IB

B. IA IIA and VIIA

C. IB and VIIB

D. IA and VIA

356. Which of the following have their outer most shell complete in atomic form ?
comments icon0

A. Coinage metals

B. Noble gases

C. Alkali metals

D. Gun metals

357. The organic compounds having very high molecular weight are called _________________?
comments icon0
A. polymers

B. aldehydes

C. ketones

D. carboxylic acids

358. The octet rule does not always hold for which of the following elements _________________?
comments icon0

A. F

B. O

C. C

D. P
359. The diffusion of gases at absolute zero will be________________?
comments icon0

A. Unchanged

B. Zero

C. Slightly increased

D. Slightly decreased

360. Rutherfords planet like structure was defective and unsatisfactory because_________________?
comments icon0
A. all

B. behavior of electron remain unexplained

C. Continuous spectrum

D. Moving e- accelerate towards the nucleus