KVPY Stream-SA (Class 11) Chemistry: Questions 49 - 53 of 133

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Question number: 49

» Atomic Structure » Quantum Mechanical Model of Atom

MCQ▾

Question

A particle contains 37 electrons, 37 protons and 50 neutrons. Find the mass deficiency of this atom is the actual calculated mass is found to be 86.909187

(Mass of electron-0.00054858amu)

(Mass of proton-1.0073amu)

(Mass of neutrons-1.0087amu)

Choices

Choice (4) Response

a.

0.657amu/atom

b.

0.234amu/atom

c.

1.54amu/atom

d.

0.816amu/atom

Question number: 50

» Basic Concepts in Chemistry » Chemical Equations and Stoichiometry

Appeared in Year: 2015

MCQ▾

Question

The gas released when baking soda is mixed with vinegar is

Choices

Choice (4) Response

a.

CO2

b.

CO

c.

CH4

d.

O2

Question number: 51

» Principles of Organic Chemistry » Nomenclature Covalent Bond Fission » Homolytic

Appeared in Year: 2011

MCQ▾

Question

After 2 hours the amount of a certain radioactive substance reduces to 116th of the original amount (the decay process follows first-order kinetics). The half-life of the radioactive substance is

Choices

Choice (4) Response

a.

15 min

b.

45 min

c.

30 min

d.

60 min

Question number: 52

» Classification of Elements & Periodicity » Chemical Reactivity

Appeared in Year: 2014

MCQ▾

Question

The order of reactivity of Na,Fe,CuandCa with water is

Choices

Choice (4) Response

a.

Na > Fe > Ca > Cu

b.

Cu > Ca > Fe > Na

c.

Cu > Fe > Ca > Na

d.

Na > Ca > Fe > Cu

Question number: 53

» Basic Concepts in Chemistry » Atomic and Molecular Masses

Appeared in Year: 2015

MCQ▾

Question

Mendeleev’s periodic law states that the properties of elements are a periodic function of their

Choices

Choice (4) Response

a.

Electronic configuration

b.

Reactivity of elements

c.

Atomic mass

d.

Atomic size

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