ECAT Pre Engineering Chemistry Chapter 1 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 1 Basic Concepts

Try The MCQ's Test For ECAT Chemistry Chapter 1 Basic Concepts

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ECAT Chemistry Chapter 1 Basic Concepts

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Question # 1

Mass spectrometer measures the

Question # 2

The empirical formula of a compound is CH2O. What may be the compound

Question # 3

Where energy is released during a reaction it is

Question # 4

Hemoglobin is 68000 times heavier than:

Question # 5

Hemoglobin contains nearly:

Question # 6

The mass of one mole of proton is

Question # 7

How many moles of hydrogen atoms does 3.2 g of methane, CH4, contain?

Question # 8

One mole of SO2contains

Question # 9

When 0.1 g of magnesium is treated with an excess of hydrochloric acid, what volume of gas at room temperature and pressure will be produced

Question # 10

The pressure of vapours when sent to the ionization chamber in mass spectrometer is

Question # 11

A limiting reactant is the one which

Question # 12

NH3, HCL, H2O, HL are:

Question # 13

What is the volume in cm3of 3.01 x 1023molecules of O2gas at S.T.P

Question # 14

What is the maximum mass of aluminium which can be obtained from 240g of aluminium oxide Al2O3?

Question # 15

Which has greater number of moles

Question # 16

A beaker contains 9 grams of water. The number of H atoms is

Question # 17

Isotopes of an element differ in

Question # 18

A compound contains 75% carbon and 25% hydrogen, by mass. What is the molecular formula of the compound/

Question # 19

How many moles of oxygen, O2are needed for the complete combustion of two moles of butane C4H10?

Question # 20

The percentage of which element in the organic compound is determined by the difference method

Question # 21

Molecules of High molecular weight usually greater than 10,000 are called:

Question # 22

Objects of the size of an atom can be observed in

Question # 23

One mole of ethanol and one mole of ethane have an equal

Question # 24

When an electron is added to a uni positive ion we get:

Question # 25

Which statement about an atom is true ?

Question # 26

The largest number of molecules are present in

Question # 27

The volume occupied by 1.4 g of N2 at S.T.P is

Question # 28

Which of the following statements is not true?

Question # 29

He Ar and Ne are:

Question # 30

A compound having empirical formula C3H3O and its molecular mass is 110.02. Its molecular formula is

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ECAT Chemistry Chapter 1 Important MCQ's

Sr.# Question Answer
1 Ascorbic acid contains 40.92% carbon, 4.58%, hydrogen and 54.4% oxygen. The empirical formula is
A. C3H4O3
B. C2H4O3
C. C3H5O4
D. C2H3O1
2 A compound having empirical formula C3H3O and its molecular mass is 110.02. Its molecular formula is
A. C3H3O
B. C6H6O2
C. C9H9O3
D. C3H6O2
3 CL2, N2 and O2 are:
A.

Diatomic molecules

B.

Hetero atomic molecules

C.

Poly-atomic molecules

D. Mono-atomic molecules
4 The empirical formula of a liquid compound is known to be C2H4O. What other information is needed to work out its molecular formula?
A. The percentage composition of the compound
B. The relative molecular mass of the compound
C. The density of the compound
D. The volume occupied by one mole of the compound
5 NH3, HCL, H2O, HL are:
A.

Diatomic molecules

B.

Poly-atomic molecules

C.

Mono-atomic molecules

D.

Hetero atomic molecules
6 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
7 The amount of products obtained from the balanced chemical equation is regarded as
A. Theoretical yield
B. Actual yield
C. % yield
D. Experimental yield
8 The empirical formula of a compound is CH2O. What may be the compound
A. C2H5OH
B. C6H5OH
C. HCOOH
9 The mass of one mole of proton is
A. 1.008 g
B. 0.184 g
C. 1.673 g
D. 1.008 mg
10

The diameter of atoms is of the order:
A. 2* 10-5m
B.

2* 10-10 m

C. 2* 10-2m
D. 2* 10-3m

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