The Correct Answer is Calcium Carbonate

Explanation:

• When carbon dioxide (CO₂) is passed through lime water (Ca(OH)₂), a milky white precipitate of calcium carbonate (CaCO₃) is formed.

• The reaction is:

• This reaction is commonly used as a test for the presence of carbon dioxide.

Key Points:

• If excess CO₂ is passed, the precipitate dissolves due to the formation of calcium bicarbonate (Ca(HCO₃)₂).

• This test is widely used in chemistry labs to detect carbon dioxide gas.

Additional Information:

• Zinc carbonate (ZnCO₃) – Does not form in this reaction.
• Calcium oxide (CaO) – Also known as quicklime, it reacts with water to form lime water but is not a precipitate.
• Sodium oxide (Na₂O) – Highly reactive with water but does not form a precipitate with CO₂.

The correct answer is (c) Greg Abel

• Warren Buffett, one of the most iconic investors in history, announced on May 3, 2025, at Berkshire Hathaway’s annual shareholder meeting that he will step down as CEO at the end of 2025.

• Greg Abel, currently the Vice Chairman in charge of non-insurance operations, has been officially named as his successor.

• This decision ensures continuity of Berkshire's core values, strategy, and investment principles.

Information Booster:

• Warren Buffett has led Berkshire Hathaway since 1965, growing it into a $1.2 trillion conglomerate.

• Greg Abel, a Canadian national, has been with Berkshire since 2000 and was appointed Vice Chairman in 2018.

• Berkshire Hathaway’s portfolio includes major holdings in Apple, American Express, Geico, and BNSF Railway.

• As of March 2025, the company holds $347.7 billion in cash reserves and has seen a 19% stock price increase in 2025, outperforming the S&P 500.

Additional Information:

• Charlie Munger, Buffett’s long-time partner, passed away in 2023.

• The leadership change is significant as global markets closely track Berkshire Hathaway’s investment decisions.

• The company is known for its value investing philosophy, which will be preserved under Abel’s stewardship.

The closest approximate value is 47.

Given:

Six friends are sitting ground a circular table facing the centre.

Gabriel is sitting second to the right of Suchita.

Ritesh is sitting second to the right of Trinabh.

Sourav is an immediate neighbour of both Gabriel and Dhruv.

From the given information arrangement will be.

Suchita is an immediate neighbour of both Ritesh and Trinabh.

Thus, correct option is (b).

Given,

'Stairs going up' means QEW ADS ZCX

'How many stairs' means PIO LJK ADS

'He is going' means QEW RYT FHG

So, 'up' means ZCX

Thus, the correct option is: (c)

Correct Answer is: Mother's father

A + B means ’A is the brother of B',

Given:

​P × Q ÷ R − S × T

From the given information Family tree will be:

P is the Mother's father of T.

Thus, the correct option is: (c) Mother's father.

Correct Answer is: Both the statements (I) and (II) are not related.

Analyzing the Relationship Between Statements:

Statement I: Talks about the possibility of heavy rainfall in northern India during monsoon. This is related to weather conditions and climate patterns.

Statement II: Talks about farmers not supplying potatoes to the market, which could be due to multiple reasons like crop failure, hoarding, market prices, or transportation issues.

Since these two statements discuss unrelated events—one about rainfall and the other about potato supply—there is no direct or indirect connection between them.​

So, Both the statements (I) and (II) are not related.​

Thus, the correct option is: (c)

The correct answer is C) Atomic radius.

Explanation:

Ionization energy is the energy required to remove an electron from an atom in the gas phase. There is an inverse relationship between ionization energy and atomic radius. As the atomic radius increases (i.e., as we move down a group in the periodic table), the ionization energy tends to decrease. This is because the outermost electrons are farther away from the nucleus, experience less attraction, and are easier to remove.

Information Booster:

• As you move across a period in the periodic table, the atomic radius decreases because the electrons are added to the same energy level while the nuclear charge increases. This causes the attraction between the nucleus and the electrons to strengthen, thus increasing ionization energy.
• As you move down a group, atomic radius increases due to the addition of electron shells, making the outermost electrons farther from the nucleus. This results in lower ionization energy, as the outermost electrons are easier to remove.
• Ionization energy is inversely proportional to the atomic radius because as the radius increases, the attraction between the outer electron and the nucleus weakens, making the electron easier to remove.

Additional Knowledge:

• Electronegativity: Electronegativity refers to the tendency of an atom to attract electrons towards itself in a chemical bond. While electronegativity generally increases across a period with increasing ionization energy, it is not inversely related. In fact, higher ionization energies usually correlate with higher electronegativity because both reflect a stronger attraction between the nucleus and electrons.

• Atomic mass: Atomic mass refers to the total mass of protons and neutrons in an atom. It does not have a direct relationship with ionization energy. While atomic mass increases down a group, ionization energy decreases due to increased atomic size rather than mass itself.

• Electron affinity: Electron affinity is the energy change that occurs when an electron is added to a neutral atom to form a negative ion. It does not have an inverse relationship with ionization energy. Elements with high ionization energy, like fluorine, typically also have high electron affinity, indicating that they are more likely to attract electrons.

Given:

(15, 405, 9)

(13, 273, 7)

Logic: (3rd number ×× 3) ×× 1st number = 2nd number

For, (15, 405, 9)

9 ×× 3 = 27

27 ××​ 15 = 405

For, (13, 273, 7) ​​

7 ××​ 3 = 21

21××​ 13 = 273

Now, we check each options.

Option (a): (11, 165, 5) (Follow)

5 ××​ 3 = 15

15 ××​ 11 = 165

​Option (b): (12, 360, 5) (Not follow)

5 ××​​ 3 = 15

15 ××​ 12 =​ 360

​Option (c): (9, 405, 9) (Not follow)

9 ××​ 3 = 27

27 ××​ 9 =​ 405

​Option (d): (14, 490, 7) (Not follow)

​7 ××​ 3 = 21

21 ××​ 14 =​ 490

Thus, correct option is (a).