ECAT Pre Engineering Chemistry Chapter 1 MCQ Test With Answer

Top Scorers Of ECAT Chemistry Chapter 1 Basic Concepts MCQ`s Test

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ECAT Chemistry Chapter 1 Important MCQ's

Sr.#	Question	Answer
1	Which statement about an atom is true ?	A. The number of neutrons is not equal to number of electrons B. Mass number is less than atomic number C. All the elements have only one mass number D. Mass number can be equal to atomic number
2	How many moles of hydrogen atoms does 3.2 g of methane, CH4, contain?	A. 0.02 B. 0.2 C. 0.4 D. 0.8
3	A limiting reactant is one which according to the stoichiometric equation	A. Has excess mass B. Has least mass C. Has excess number of moles D. Has least number of moles
4	The mass of Al2S3formed when 20 grams Al reacts completely with S is	A. 60 g B. 50 g C. 50.55 g D. 55.55 g
5	The amount of products obtained from the balanced chemical equation is regarded as	A. Theoretical yield B. Actual yield C. % yield D. Experimental yield
6	The branch of science dealing with structure, composition and changes in matter and laws and principles which govern these changes is called as	A. chesmistry B. Geology C. Physics D. Mechanics
7		A. N2O4is limiting reactant B. N2H4is the limiting reactant C. Reactants are completely converted to the products D. Reactions is reversible
8	CL2, N2 and O2 are:	A. Diatomic molecules B. Hetero atomic molecules C. Poly-atomic molecules D. Mono-atomic molecules
9	Relative atomic mass of an element is the mass of the element relative to	A. 1/12 mass of carbon-12 B. 1/12 mass of carbon C. 1 mass of hydrogen atom D. 1/16 mass of oxygen
10	A limiting reactant is the one which	A. Is taken in lesser quantity in grams as compared to other reactants B. Is taken in lesser quantity in volume as compared to other reactants C. Gives the maximum amount of the product which is required D. Gives the minimum amount of the product under consideration