Chemistry-Periodic Classification of Elements [NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension]: Questions 1 - 5 of 23

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Question 1

Periodic Classification of Elements
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Question

MCQ▾

Who compared the properties of elements with notations of music and propounded ‘law of octaves’ for the classification of elements?

Choices

Choice (4)Response
a.Dobereiner
b.Newland
c.Mendeleef
d.Lothal Mayer

Question 2

Periodic Classification of Elements
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Question

MCQ▾

An element X forms and oxide X 2 O 3. In which group of Mendeleef s periodic table is this element located?

Choices

Choice (4)Response
a.Group III
b.Group V
c.Group VIII
d.Group II

Question 3

Periodic Classification of Elements
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Question

MCQ▾

Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?

Choices

Choice (4)Response
a.By industrially synthesised fertiliser
b.By electrical discharges in the atmosphere
c.By cyanobacteria
d.By denitrification

Question 4

Periodic Classification of Elements
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Question

MCQ▾

An electron dot structure for an element shows that element’s symbol and an arrangement of dots that indicates the

Choices

Choice (4)Response
a.total number of electrons
b.number of electrons in the outer energy level
c.atomic mass
d.atomic number

Question 5

Periodic Classification of Elements
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Question

MCQ▾

What is the most correct name for the ionic compound formed by

Choices

Choice (4)Response
a.Iron (II) chloride
b.Iron (I) chloride
c.Iron (IV) chloride
d.Iron (III) chloride