Question Discussion & Solution

The correct answer is Barium.

Key Points

• Metal salts commonly used in firework displays include calcium chloride, sodium nitrate, barium chloride, copper chloride, etc.
• The green flame produced in fireworks is due to the presence of Barium.
• The blue flame is due to the presence of Copper.
• The orange flame is due to the presence of Calcium.
• A yellow flame is due to the presence of Sodium.
• Lithium is used to impart a red colour to fireworks.

Additional Information

• Barium (Ba):
  • The atomic number is 56.
  • It is mostly used in drilling fluids for oil and gas wells and also used in paints and glassmaking.
  • It is found in combination with other elements.
  • Barite is one of the major ores of Barium.
• Calcium (Ca):
  • The atomic number is 20.
  • Calcium provides strength to bones and teeth along with vitamins.
  • It also plays an important role in blood formation, muscle contraction, clotting of blood, etc.
  • Milk, eggs, fish, etc. are the main sources of calcium.
• Lithium (Li):
  • Atomic Number is 3.
  • Lithium is the lightest metal on the periodic table.
  • It is widely used in rechargeable batteries for mobile phones, laptops, digital cameras, etc.
• Chromium (Cr):
  • The atomic number is 24.
  • It is used in manufacturing stainless steel.
  • Chromite is the major ore of Chromium.
  • It is a blue-white hard, brittle, and very corrosion-resistant metal and is used to produce several alloys.

402° - 302° = 100° in North-East direction

The correct answer is China.

Key Points

• The Russia and China joint naval exercises “Joint Sea 2021” has kicked off at Russia’s Peter the Great Gulf, in the Sea of Japan, on October 14, 2021.
• The exercises will culminate on October 17, 2021.
• The drill is being carried out as part of ‘Joint Sea’ 2021, the series of bilateral naval exercises that have been taking place between the two services since 2012.

Additional Information

•  Important Exercises between India and other countries:

The correct answer is Musca domestica.

• The scientific name of Housefly is Musca domestica.

Additional Information 

The logic followed is:

L, M, X, Y and Z each having a different salary.

i) X is getting more salary than only M.

X > M

Important Points

As the word only is used this means X's salary is only greater than M.

ii) L is getting less salary than Y, who is not getting the highest salary.

Y > L but Y is not getting the highest. Y's salary is greater than L.

Mistake Points

Who is used for the second person in a connecting statement.

For example, in the above question : 

L is getting less salary than Y, who is not getting the highest salary.

Here, who is used for Y and not for L.

Thus combining the both we get:

Z > Y > L > X > M.

Thus Z is getting the highest salary.

Hence, the correct answer is "Z".