Answer:
On the periodic table, each column is called a group. So, the answer is D. groups.
Explanation:
A) is incorrect because the rows on the periodic table are called periods.
B) is incorrect because the elements are what is organized on the periodic table.
C) is incorrect because the periods are the rows on the periodic table.
D) is the correct answer because the columns on the periodic table are called groups.
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dissolves in water to give

and

ions according to the following reaction:

-------->

+ 2

So, according to the above reaction, 1 mole of

produce 2 moles of

ion,
So, 0.3 mole will give = 0.3 x 2 = 0.6 moles of

ion
So, Molar concentration =

Note: 1L = 1000mL
Hydrogen and Helium are the first 2 elements
The formula of a compound formed between nitrogen (N) and barium (Ba) is BARIUM NITRIDE Ba3N2.
3Ba + N2 ------> Ba3N2
Answer:
Option d = terpenes
Explanation:
Terpenes:
It is unsaturated hydrocarbons extracted from the plants specially from pine and citrus. These are cyclic compound with the formula C₁₀H₁₆.
1. It is used as a solvent for natural products.
2. It is used in food , cosmetics and pharmaceutical industries.
3. It is very effective ingredients for agricultural pesticides.
4. It is used as a fragrance in perfumes.
5. As a flavoring agent it is also added into the beverages products.
6. It is highly concentrated and used in very small amount to create fragrances.
7. Its high concentration can led to the bad flavor and fragrances.