Which of the following statements is INCORRECT?
(A) Radon is obtained from the decay of radium
(B) Helium is inert gas
(C) Xenon is the most reactive among the rare gases
(D) The most abundant rare gas found in the atmosphere is helium

The most abundant inert gas found in atmosphere is helium

Name the noble gas which (A)is most abundant in atmosphere , (B)has least boiling point.

An ideal gas in a closed container is slowly heated. As its temperature increases, which of the following statements are true? (A) the mean free path of the molecules decreases. (B)the mean collision time between the molecules decreases. (C ) the mean free path remains unchanged. (D) the mean collision time remains unchanged.

Which of the following statements is wrong for gases? (a)Gases do not gave a definite shape and volume (b)Volume of the gas is equal to volume of container confining the gas (c)Confined gas exerts uniform pressure on the walls of its container in all directions (d)Mass of gas cannot be determined by weighing a container in which it is enclosed

Read the following statements: A. Dura mater is the outer layer of the cranial meninges. B. Electrical synapses are rare in the human body . C. The tectorial membrane is found in the middle ear. How many statements are incorrect?

Which of the following statements is correct? (a). Nickel is a silver white metal. (b). Nickel dimethylglyoxime is square planer. (c). Among complexes of cobalt the most stable are those of Co^(2+) , (d). Among simple compounds of cobalt the most stable are those of CO^(2+) .

which of the following statement is incorrect w.r.t. Azolla? (a) it is an aquatic water fern (b) it is used as biofertilizer (c) it is homosporous vascular cryptogam (d) it shows symbiotic association with alga Anabaena which fixes atmospheric nitrogen

Which of the following statement(s) is/are incorrect: Statement (a) : Reversible isothermal compression of an ideal gas represents the limiting minimum value of the workdone (lwl) by the surrounding on the system. Statement (b) : In an irreversible process, the cyclic integral of work is not zero. Statement (c) : For thermodynamic changes in adiabatic process ""_(T)((C_(p.m))/(R)).P = constant Statement (d) : DeltaS_("system") is zero for reversible adiabatic expansion of an ideal gas.

Which of the following statement is / are incorrect ? (i) Green light falling in the range of wavelength 500 -580 nm is least effective for photosynthesis. (ii) In non - cyclic photophosphorylation, the electron expelled from the reaction centre is not cycled back , though its loos is compensated by electrons from the photolysis of water . (iii) Chl a , Chl b , carotenoids , and xanthophylls are insoluble in organic solvents. (iv) 400-700 nm light is used in photosynthesis also known as PAR. (v) Red light is the most effective for photosynthesis.

Which of the following statements is correct ? a. rRNA is the most abundant RNA. b. Ribosomes are composed of approximately 80% rRNA and 20% ribosomal proteins . c. rRNA is a type of coding RNA .