Chemistry MCQS

281. Physisorption occurs at?
(A) High temperature
B. Low temperature
(C) Moderate temperature
D. None of the above

282. Molecularity of reaction is always in?
A. Whole number
(B) Real number
(C) Natural number
(D) Even number

283. Who classified element first time?
(A) Newlands
(B) Dobereiner
C. Lothar Meyer
(D) Rutherford

284. Colloidal particles are?
(A) Positive
(B) Negative
C. Neutral
(D) None of the above

285. What is the unit of active mass?
(A) Gram molecule per litre
B. Gram atom per litre
(C) Gram litre
(D) None of the above

286. Identify the correct statement among the following?
(A) Order of reaction is in number.
(B) Order of reaction is not in fraction.
C. Order of reaction is in fraction.
(D) All are correct.

287. Following properties of liquid decrease with an increase in temperature except:
A. Surface tension
B. Viscosity
C. Vapor pressure
D. Density

288. Surface tension of a liquid is inversely related to:
A. Density of liquid
B. Number of drops of liquid
C. Mass of drops of liquid
D. All of these

289. Liquid crystals are always __
A. Isotropic
B. Anisotropic
C. Electric conductor
D. None of these

290. Liquid crystals are used is skin thermograph because these are:
A. Anisotropic
B. Isotropic
C. Temperature sensors
D. Fluids