Question Discussion & Solution

The correct answer is option 3 i.e. the Atomic Number

• The periodic table is based on Atomic Number.
• The atomic number is the number of protons found in the nucleus of every atom of that element. 
• The periodic table is managed by the International Union of Pure and Applied Chemistry, or IUPAC.
• In 1869, Dimitri Mendeleev included 63 known elements arranged according to increasing atomic weight. But there were many elements he could not place in the periodic table and with the discovery of new noble elements, there was a need to arrange the elements. Henry Moseley later arranged the elements in the periodic table by their number of protons rather than their atomic weights.
• The modern periodic table orders the elements according to increasing atomic number rather than increasing atomic weight.
• There are 118 elements in a periodic table. There are seven periods and eighteen groups in the modern periodic table.
• On moving from left to right in a period, the size of atoms(atomic size) decreases.
• On moving from left to right in a period, the metallic character of elements decreases, whereas the non-metallic character increases.
• While going down in a group of the periodic table, the size of atoms increases (or atomic size increases).
• While going down in a group of the periodic table, the metallic character of elements increases.
• Electronegativity and reactivity of non-metals increase along the period and decrease down the group.

The correct answer is Al2O3.

Key Points

•  Al2O3  reacts with acids and bases.
  • Aluminum oxide (Al2O3) is an amphoteric substance.
  • The amphoteric substance is a substance that can react with both acids and bases usually to produce salt and water.
  • Aluminium oxide therefore can react with both acids as well as bases. We will take the example of its reaction with hydrochloric acid (strong acid) and sodium hydroxide (strong base).
  • When mixed with these two compounds aluminium oxide either acts like  acid with a base and a base with an acid.

Additional Information

• Al₂O₃ + 6 HCl → 2 AlCl₃ + 3 H₂O (acts like a base)
• Al2O3 + 2 NaOH + 3 H₂O → 2 NaAl(OH)₄ (sodium aluminate) (acts like an acid)
• On reacting Al2O3 with HCl, we get Aluminium Chloride as the salt and water as a by-product.
  • Likewise, the reaction between NaOH ( Strong Base) and Al₂O₃ results in the formation of Sodium Aluminate as salt and water.

The correct answer is Windows, Icons, Menus.

• In a GUI-based operating system, the graphical user interface is based on Windows, Icons, Menus.

Key Points

• A  graphical user interface(GUI) uses windows, icons, and menus to perform various commands, such as opening, deleting, and moving files.
• A GUI operating system is primarily navigated using a mouse, a keyboard can also be used via keyboard shortcuts or arrow keys. 

Pattern followed is,

D + 6 = J

J + 5 = O

O + 4 = S

S + 3 = V

V + 2 = X

Hence, “O” is the correct answer.

The correct answer is Yash Dhull.

Key Points

• Yash Dhull became only the third Indian batsman to score a century at the U19 World Cups.
• ICC Under 19 World Cup:
  • The ICC Under-19 Cricket World Cup is an international cricket tournament organized by the International Cricket Council (ICC).
  • It is contested by national under-19 teams.
  • The first edition was held in 1988, as the Youth World Cup.
  • It was not staged again until 1998. Since then, the World Cup has been held as a biennial event.
  • India has won the World Cup on a record 5th times and India is the most successful team.
  • After India, Australia has won 3 titles.
    • Format: 50 overs
    • First edition: 1988 (Australia)
    • Latest edition: 2020 (South Africa)
    • Next edition: 2022 (West Indies)
    • Number of teams: 16
    • Current champion:  Bangladesh (1st title)​ 

Additional InformationInternational Cricket Council:

• Predecessor: Imperial Cricket Conference (1909 - 1965), International Cricket Conference (1965 - 1989)
• Formation: 15 June 1909
• Headquarters: Dubai.
• Members: 106
• Chairman: Greg Barclay(New Zealand)
• Deputy Chairman: Imran Khwaja (Singapore).