Most of the ozone in the atmosphere is concentrated in the

A. Mesosphere
B. Troposphere
C. Stratosphere
D. Ionosphere

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What are Columns in Periodic table called?

A. Period
B. Group
C. Verticals
D. Perpendiculars

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What are rows in Periodic table called?

A. Period
B. Group
C. Verticals
D. Perpendiculars

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How many rows and columns are in the modern Periodic Table?

A. 18 columns and 7 rows
B. 12 columns and 9 rows
C. 7 columns and 18 rows
D. 25 columns and 15 rows

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Marie Currie won Noble Prize in Chemistry in which year——-

A. 1906
B. 1907
C. 1908
D. None of these

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The electrode through which the electron enter the electrolytic solution is:

A. Anode

B. Cathode

C. Salt Bridge

D. Electrolyte

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