Are solvents made from natural sources such as pine and citrus oils.
a) aqueous cleanersb) chlorinec) etheylenesd) terpenes

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.

answer: h+ its less than oh

explanation:

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.