Question

Which of the following ions will most likely form a precipitate when reacted with SO42-?

1. F-
2. Na+
3. Ba2+
4. Rb+

Which of the following compounds contains a double compound?
1. ethene ( C2 H4)
2. Chlorine (Cl 2)
3. ammonia (NH3)
4. Methane (CH4)

In an electron dot diagram of ethylene (C2H4) How many bonds are present?
1. 3
2. 2
3. 1
4. none

Answer 1

1. Answer is: 3) Ba2+
Ionic reaction: Ba²⁺ + SO₄²⁻ → BaSO₄ (white precipitate).
2. Answer is: 1) ethene ( C2H4).
Ethene is alkene, alkenes are organic compound with one double bond.
3. Answer is: 3) 1
Number of double bonds present in a molecule of ethene is one.

Answer 2

The correct options are as follows:
1. Ba2+.
When Ba2+ react with SO42-, it will yield BaSO4, which is a precipitate. A precipitate refers to ionic solids products which are insoluble in aqueous solutions, they are formed when some positive and negation ions are combined in chemical reactions.
2. ETHENE.
Ethene contains a double bond. A chemical compound is said to contain a double bond if there are four bonding electrons between the elements in the compound. In a double chemical bond, two elements typically shared two pairs of bonding electrons. Double bonds are typically formed between atoms of carbon, sulphur, nitrogen and oxygen. Double bond is denoted by two lines between the bonded atoms, for instance, C = C.
3. TWO.
There are two different types of bond in ethylene, these are single bond and double bond. Ethylene has four single covalent bonds and one double covalent bond. The Lewis dot structure is used to show the bonding between the valence electrons of a compound. Ethylene has 12 valence electrons and these are shared in this manner: 4 [double bond], 2 [single bond], 2, 2, 2.