A cleaning solution is used to remove limescale, CaCO3, from bathroom surfaces. When the solution is sprayed onto the limescale, effervescence (fizzing) occurs and the solid limescale begins to disappear. This chemical reaction is needed because the limescale cannot be removed with water alone. Which of the following statements about this chemical reaction are correct? 1. The cleaning solution is acidic. 2. The effervescence (fizzing) is caused by the release of hydrogen gas. 3. The pH of the reacting solution will go down as the reaction proceeds. 4. The salt produced in the reaction is more soluble than CaCO3
Correct answer: C. 1 and 3 only
- A. 1, 2, and 3 only
- B. 1 and 4 only
- C. 1 and 3 only
- D. 2 and 3 only
Explanation
Statements 1,3 are correct. Based on the information provided, the correct statements about this chemical reaction are: The cleaning solution is acidic. The pH of the reacting solution will go down as the reaction proceeds. Explanation: The cleaning solution being acidic is likely the reason why it can dissolve limescale (CaCO3). Acidic solutions can react with and dissolve calcium carbonate, breaking it down into soluble products. The effervescence (fizzing) occurs due to the reaction between the acidic solution and calcium carbonate. When an acid reacts with a carbonate compound like CaCO3, it releases carbon dioxide (CO2) gas, which causes the fizzing. As the reaction proceeds and the acidic solution reacts with the limescale (CaCO3), it will produce carbon dioxide gas and water. The presence of carbon dioxide in the solution can lead to the formation of carbonic acid (H2CO3) by combining with water. This carbonic acid can further contribute to the acidic nature of the solution, leading to a decrease in pH. However, statement 4 cannot be determined based on the information provided. The given information does not mention the specific salt produced in the reaction, nor does it provide any details about its solubility compared to CaCO3.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
Practise Scientific Reasoning
334 free Scientific Reasoning MCQs from Analytical and Logical Reasoning, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Analytical and Logical Reasoning questions like this
Analytical and Logical Reasoning is on 27 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Scientific Reasoning questions
A dice is numbered from 1 to 6 in different ways. If 1 is adjacent to 2, 4, and 6, then which of the following statements is necessarily true?
I received the following email:I have only $2250 but I want to send two messages to the largest number of addresse worldwide. What is the largest number of addresses I can contact?
The yeast I use to make bread doubles in size overnight, but I take a fixed weight away each day.Which one of the following plots could not show the weight of yeast on consecutive days after the ixed weight has been removed?
The price for hiring a car is determined by the number of days for which it is to be hired and the number of people who will be using it. The table below shows the prices for groups of up to 5 people hiring cars for up to 7 days. Patrick is part of a group of 5 people on a holiday for 5 days. They will be going on outings each day, and had planned to hire one car for all of them for all 5 days. However, two of the group of people will only be there for the first 3 days, so an alternative is to hire one car for this period and another for the final two days. What will be the difference if they choose this alternative?
A cleaning solution is used to remove limescale, CaCO3, from bathroom surfaces. When the solution is sprayed onto the limescale, effervescence (fizzing) occurs and the solid limescale begins to disappear. This chemical reaction is needed because the limescale cannot be removed with water alone. Which of the following statements about this chemical reaction are correct? 1 The cleaning solution is acidic. 2 The effervescence (fizzing) is caused by the release of hydrogen gas. 3 The pH of the reacting solution will go down as the reaction proceeds. 4 The salt produced in the reaction is more soluble than CaCO3
In a restaurant recently, I received the following bill: Starter $7.00 Main Course $20.75 Dessert $9.75 Drink $4.50 Service Charge $5.25 TOTAL $47.25 What percentage of the cost of the food and drink had been added to the bill as service charge?