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Questions |
Answers |
| 1 |
UNESCO inaugurated the celebration of 2019 as the International Year of the Periodic Table of Chemical Elements to celebrate its completion of how many years? |
150 |
| 2 |
What is the usual property of oxides of Groups 3 and 4? |
Basic and Acidic |
| 3 |
The element found maximum in the soil layer is – |
Oxygen |
| 4 |
Which is present in the largest amount in terms of percent by mass in the earth’s crust? |
Oxygen |
| 5 |
Which is the most abundant element after Oxygen? |
Silicon |
| 6 |
Which is the most common element in the Universe? |
Hydrogen |
| 7 |
Approximately how many different chemical elements exist on the earth? |
100 |
| 8 |
The chemical composition of a diamond is? |
Carbon |
| 9 |
Which element was first produced artificially? |
Technetium |
