1. The grouped data is also called ..?
a. Secondary data
b. Primary data
c. Raw data
d. Qualitative data
2. An element A has valency 3, the formula of its carbonate is
- A3(CO3)3
- A2(CO3)3
- A3(CO3)2
- A2(CO3)2
The correct answer and explanation is:
Answers:
- The grouped data is also called:
- (a) Secondary data ✅
- The formula of the carbonate of an element A with valency 3:
- A2(CO3)3 ✅
Explanation:
1. Grouped Data and Secondary Data
Grouped data refers to data that has been organized into categories or intervals. It is different from raw data, which is unprocessed and collected directly from observations. When data is grouped, it is typically arranged into frequency distributions or tables, making it easier to analyze.
Grouped data is often derived from primary data but, in most cases, is referred to as secondary data because it has already been collected, categorized, and sometimes even analyzed by someone else. Secondary data includes information from books, surveys, censuses, and databases that have been processed.
Thus, the correct answer is (a) Secondary data.
2. Determining the Carbonate Formula of an Element with Valency 3
To find the correct formula of the carbonate compound for element A with valency 3, we consider the following:
- Carbonate ion (CO₃²⁻) has a charge of -2.
- The element A has a valency of 3, meaning it forms A³⁺ ions.
- To form a neutral compound, the total positive and negative charges must balance.
We set up the equation:
- x atoms of A³⁺ contribute 3x positive charges.
- y carbonate ions contribute (-2y) negative charges.
For a neutral compound: 3x=2y3x = 2y
Setting x = 2 and y = 3 satisfies this equation: 3(2)=2(3)=63(2) = 2(3) = 6
Thus, the correct formula of the carbonate of A is A₂(CO₃)₃.
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