Question

7. New Dec 11 2018. Which of the following is acidic when dissolved in water? SO, b. NO c. Na-O d. CaO Two of these a. e. NEW July 27, 2019. Elements of moderm periodic table are arranged according to increase in Group 2A elements are called and group 7A elements of periodical table are called.. 8. , respectively, atomic number /Alkaline earth metals/ noble gases b. a. atomic number /alkali metals / alkaline earth metals atomic number /Alkaline earth metals/ and halogens Atomic mass /alkali metals/ noble gases c. d. 9. When drops of Cl/water are added to toluene in the presence of small amount of K.Br a. Br is formed b. Cl, is formed in toluene Br, is formed d. c. No reaction occurs More information is needed e. 10. Two test tubes, the first contains a strip of Mg metal and the second contains a strip o. Al metal. When drops of 6 M HCI was added the two metals were dissolved and MgCl and AICI, are formed, respectively. After that, NaOH solution was added to both test tubes and a precipitate is formed in each case (Mg(OH), and Al (OH),). If we continue adding NaOH, which precipitate dissolves and what is the product?

Answer 1

Solution: 7

Oxide that gives an acidic solution when dissolved in water is to be determined.

(a) SO₂

When SO₂ is dissolved in water. It undergoes a reaction in order to form sulfurous acid. This compound is one of the components of acid rain. The chemical reaction is shown below:

SO2 + H2O + H2SOZ

Therefore, SO₂ is acidic when dissolved in water.

(b) NO₂

When NO₂ is dissolved in water. It reacts with water to form nitric acid. Nitric acid is known as one of the components of acid rain. The chemical reaction is shown below:

3NO2 + H2O → 2HNO3 + NO

Therefore, NO₂ is acidic when dissolved in water.

(c) Na₂O

Sodium oxide (Na₂O) is a strongly basic salt. It gives sodium hydroxide on reaction with water. The chemical reaction is as follows:

Na2O + H2O → 2NaOH

Therefore, Na₂O is basic when dissolved in water.

(d) CaO

Calcium oxide (CaO) has a basic chemical nature. It gives calcium hydroxide on reaction with water. The chemical reaction is as follows:

CaO+H20 + Ca(OH),

Therefore, CaO is basic when dissolved in water.

(e)

Two of these.

Answer: Since both SO₂ and NO₂ are acidic in nature. The correct option is (e).