Entry Test MCQ :: Basic Concept

 NOTE :ANSWERS ARE PRESENT AFTER 10 MCQs

1.	Diameter of an atom is in the order of
	A. 0.2m B. 0.2mm C. 0.2nm D. 0.2pm

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2.	Which of the following are isoelectronic species?
	A. H+ H H- B. Li+ Na+ K+ C. C1- Br- I D. F- Ne Na+

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3.	Mass spectrometer is used to determine Mass number of isotopes and
	A. Atomic number B. Relative abundance C. Electronic configuration D. All of the above

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4.	Molecular ions are formed by passing
	A. High energy electron beam B. ? - particle C. X-rays D. All of the above

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5.	The number of peaks obtained in mass spectrometry shows
	A. Relative abundance B. Average mass of element C. Number of isotopes D. Relative isotopic mass

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6.	Empirical formula of chloroform is
	A. CH2 C12 B. CH3C1 C. CC14 D. CHC13

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7.	Which one is true about isotope?
	A. Same number of neutrons B. Same mass number C. Same physical properties D. Same chemical properties

8.	Molecular mass of water (18g) means
	A. 1-mole molecules of water B. 1-gram molecule of water C. 3-gram atoms D. all

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9.	Which of the following ion formation is always exothermic?
	A. Uni-negative B. Uni-positive C. Di-negative D. Di-positive

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10.	Which of the following statements about isotopes is correct?
	A. Isotopes with odd atomic number are abundant B. Isotopes with odd atomic number and even mass number are abundant C. Isotopes with even atomic number and even mass number are abundant D. Isotopes with even atomic number and odd mass no are abundant

ANSWERS OF ABOVE TEN MCQs
1.(C) 2.(D) 3.(B) 4.(D) 5.(C) 6.(D) 7.(D) 8.(D) 9.(A) 10.(C)

11.	The sample of isotopes of an element which needs not to be vaporized in the vaporization chamer
	A. Gas B. Liquid C. Volatile solid D. All

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12.	One mole of CO2 contains.
	A. 6.022 x 1023 atoms of oxygen B. 22-gram electrons C. 6.022 x 1023 atms of carbon D. both b & c

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13.	Avogadros number may represent
	A. volume of particles B. number of particles C. mass of particles D. All of the above

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14.	The number of isotopes of elements with even mass number and even atomic number are.
	A. 280 B. 300 C. 154 D. 54

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15.	Size of molecule depends upon
	A. Atomicity B. Shape of molecule C. Both a and b D. Difficult to predict

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16.	Which of the following terms is not used for ionic compound?
	A. formula unit B. empirical formula C. molecular formula D. formula mass

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17.	0.36 moles of each aluminium and oxygen react with each other to produce aluminium oxide. The amount of product formed is
	A. 0.18 mole B. 0.27 mole C. 0.24 mole D. 0.09 mole

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18.	Which of the following terms is used for the mass of chlorine 35.5?
	A. relative atomic mass B. mass number C. atomic weight D. relative isotopic mass

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19.	Which one of the following has the maximum number of isotopes?
	A. oxygen B. carbon C. tin D. chlorine

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20.	Which one of the following is not the mono isotopic element?
	A. arsenic B. uranium C. iodine D. nickel

ANSWERS OF ABOVE TEN MCQs
11.(A) 12.(D) 13.(D) 14.(C) 15.(C) 16.(C) 17.(A) 18.(A) 19.(C) 20.(B)