Entry Test MCQ :: Basic Concept •

NOTE :ANSWERS ARE PRESENT AFTER 10 MCQs

21.	The volume occupied by 2.8 g of N2 at STP
	A. 2.24 dm3 B. 22.4 dm3 C. 1.12 dm3 D. 112 dm3

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22.	The mass of decimole of electrons (NA) is
	A. 1.008 mg B. 0.184 mg C. 0.054 mg D. 5.4 mg

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23.	The number of moles of CO2 which contains 16 g of oxygen is
	A. 0.25 B. 0.5 C. 0.75 D. 1

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24.	Which of the following statements is wrong about isotopes?
	A. they possess different mass number B. they possess different physical properties C. they possess same chemical properties D. they possess different position in the periodic table

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25.	How many isotopes have odd atomic number?
	A. 154 B. 280 C. 86 D. 300

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26.	Qualitative analysis is carried out for
	A. identification of elements B. estimation of amounts of elements C. molar ration of elements D. molar volume of elements

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27.	Percentage of calcium in calcium carbonate is
	A. 80% B. 30% C. 40% D. 20%

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28.	Combustion analysis is performed to determine
	A. Empirical formula B. Molecular mass C. Molecular formula D. Formula mass

29.	Mostly elements have fractional atomic masses because of
	A. mass of an atom itself is in fraction B. atomic masses are average masses of isobars C. atmoic masses are average masses of isotopes proportional to their relative abundance D. atmoic masses are average masses of isotopes

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30.	Isotopes differ in
	A. properties which depend upon mass B. arrangement of electrons in orbitals C. chemical properties D. all of the above

ANSWERS OF ABOVE TEN MCQs
21.(A) 22.(C) 23.(B) 24.(D) 25.(C) 26.(A) 27.(C) 28.(A) 29.(C) 30.(A) 

31.	Which of the following is not a macromolecule?
	A. sand B. haemoglobin C. diamond D. maltose

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32.	Which of the following methods is used to estimate hydrogen in an organic compound?
	A. Combustion method B. Dumas method C. Kjeldahls method D. All of the above methods are for different purposes

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33.	Isotopes of the same elements has
	A. different number of protons B. same number of neutrons C. different number of neutrons D. same mass number (nucleon number)

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34.	The nucleus of an atom of every element will always contain
	A. neutrons B. protons and electrons C. protons D. protons and neutrons

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35.	When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen
	A. lighter B. intermediate C. heavier D. are collected at same time

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36.	When 0.5 mole of phosphoric acid is dissolved in aqueous solution how many moles of -ve and +ve ions are collected altogether?
	A. 0.5 B. 1 C. 1.5 D. 2

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37.	For which of the following compounds the term empirical formula cannot be applied?
	A. NaCl B. H2O C. CCI4 D. It can be applied to all mentioned above

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38.	Dempsters mass spectrometer has number of zones / parts
	A. 5 B. 4 C. 3 D. 2

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39.	The properties of an element mosly corresponds to that isotope which has greater
	A. Mass number B. Atomic mass C. Relative abundance D. all of the above

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40.	1 a.m.u =
	A. 1.6 x 10-27 kg B. 1.6 x 10-24 kg C. 1.6 x 10-26 kg D. 1.6 x 10-28 kg

ANSWERS OF ABOVE TEN MCQs
31.(D) 32.(A) 33.(C) 34.(C) 35.(A) 36.(D) 37.(D) 38.(A) 39.(C) 40.(A)