An element reacts with oxygen to give a water soluble compound which turns red litmus blue. This solution also used to test carbon dioxide gas. The element is -?

Calcium
Carbon
Sulphur
Magnesium

LohaHridoy

6 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 1 : Calcium

Concept:

Group 1, 2, and lanthanides from basic compounds of oxygen when they react with dioxygen.
When a metal reacts with oxygen, the resultant oxide is a base.
Whenever red litmus paper comes into contact with any basic substance, it becomes blue.
A few instances of basic substances are ammonia gas, milk of magnesia, baking soda, and limewater.

Explanation-

Carbon belongs to Group 14, and sulfur belongs to Group 16, hence they can't form bases.
Calcium and Magnesium belong to the Group 2 of the periodic table.
Limewater is a solution of calcium hydroxide.
Carbon dioxide responds with calcium hydroxide solution to produce a white precipitate of calcium carbonate.
If carbon dioxide rises through limewater, the limewater turns milky or cloudy white.
Thus, it is used to test carbon dioxide gas.

Confusion Points

The results from Mg(OH)₂/MgO systems show that CO₂ only slightly reacts with MgO and Mg(OH)₂ during heat storage and release processes.
This study indicates that carbonic acid (H₂CO₃) could easily react with CaO/Ca(OH)₂ to form CaCO₃ during heat release processes.

Mistake Points As, per the official answer key option (Magnesium), is correct but according to the question, and solution correct option (Calcium) is correct.

6 views Answered 2022-09-04 04:29

Related Questions

In the following question below are given some statements followed by some conclusions. Taking the given statements to be true even if they seem to be at variance from commonly known facts, read all the conclusions and then decide which of the given conclusion logically follows the given statements. Statements: I. All pen are pencils. II. All pencils are red. III. No pen is blue. Conclusions: I. No pencil is red. II. Some pencils are pens. III. No red is blue.?

1 Answers 4 Views

The following question, there are three statements I, II and III. Read the question carefully and mark your answer according to which statements(s) is/are sufficient to the answer the question. Find the probability that both the balls are of blue color. Statement I: In a bag containing 4 red balls, 6 blue balls and 8 yellow balls, two balls are drawn at random one by one without replacement. Statement II: First ball is blue and if this happens then 5 more blue balls are added in the bag Statement III: Total blue balls are twice more than the other balls at the end of the drawing of balls?

1 Answers 5 Views

Study the two cases and answer in terms of relation between the two cases Case 1: Two cans are filled with the mixture of milk and water. The first can contain 72% of water and second can contains 60% of water. A new mixture is prepared by taking 9 part of first can and 6 part of second can. The percentage of milk in the new mixture is Case 2: For testing, 80 ml of milk and water mixture is taken from a container which has 62% water by weight. If in the test tube, additional 20% water of the total water is added, then the % of milk in the test tube is?

1 Answers 6 Views

An acid is a substance which: I. is sour in taste II. turns red litmus paper into blue?

1 Answers 4 Views

Compare the values of the two quantities in the question and answer. Quantity 1: A bag contains 20 balls which are red, green and blue. Find the number of red balls in the bag, if the probability of picking a blue ball is 2/5 and that of either a red or a blue ball is 3/4. Quantity 2: A bag contains 25 balls which are red, green and blue. The probability of picking a red ball first is 2/5. If the first ball was red and without keeping it back, probability of picking a blue ball is 1/3, find the number of green balls.?

1 Answers 4 Views

In the following question, the 1st and the last part of the sentence/ passage are numbered 1 and 6. The rest of the sentence/passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct. 1. Global warming is the rise in average surface temperature of the earth globally. P. It is caused by the greenhouse effect of increased level of greenhouse gases. Q. Deforestation also increases carbon dioxide emissions. R. Greenhouse gases include carbon dioxide, CFCs, etc. S. The increasing use of fossil fuels is a major cause of carbon dioxide emission. 6. Carbon dioxide traps heat and causes the greenhouse effect.?

1 Answers 6 Views

Which of the following turns Blue litmus Red?

1 Answers 4 Views

A student puts a punch of turmeric in solutions marked A and B. She writes the following statements in her copy S1 - Solution A turns red and there is no change in solution B S2 - Solution A is base and solution B is an acid. S3 - turmeric can be used to differentiate between acids, bases and salts. Which of the following statements is correct?

1 Answers 8 Views

A metal 'M' reacts with oxygen to form a compound 'X'. Compound 'X' forms salt and water on reaction with both sulphuric acid and potassium hydroxide, separately. Which metal is this?

1 Answers 4 Views

An element 'X' is a poor conductor of electricity. It burns in oxygen to produce a gas which dissolves in water and the solution turns blue litmus paper red. The element 'X' is -?

1 Answers 14 Views

এক্সাম দিয়ে মেধা যাচাই করুন

Job Preparation (1125)

Admission (754)

এসএসসি (10)

এইচএসসি (5)