Question Discussion & Solution

The correct answer is Lead and Tin.

Key Points

• Soldering is the process of joining two metal objects together by a third soft metal alloy which is called solder.
• Solder is a metal alloy that melts at a lower temperature than the metals being soldered.
• A commonly used alloy is solder, which is an alloy of tin (Sn) and lead (Pb).
• The alloy of tin-lead solder is a mixture of 63% tin and 37% lead. 63/37 solder melts at 183°C.
• So, Alloy of tin (Sn) and lead (Pb) is used for welding electrical wire together.

Additional Information

• Element Tin (Sn) belongs to Group 14 of the periodic table.
  • Atomic Number - 50
  • Atomic Mass  - 118.710 amu.
• Element Lead (Pb) belongs to Group 14.
  • Atomic Number - 82
  • Atomic Mass - 207.2 amu.

The correct answer is Tartaric acid.

• Tartaric acid is an organic acid that is white and crystalline.

Key Points

• It is found naturally in many fruits like grapes, bananas, tamarind, etc.
• This acid is added to foods as an antioxidant and to give its distinctive sour taste.
• Crystals and powders are prepared by a chemical process.
• It is also added to food for preservation.
• It is also a good antioxidant and is beneficial for kidneys.
• It helps to absorb minerals in the body.
• It is also helpful in controlling problems related to gases in the body.

The correct answer is Palash.

• Palash tree is called the Flame of the Forest in Rajasthan.

Key Points

• Flame of the Forest, also known as Palash Tree is a very beautiful Indian tree with bright crimson orange-colored flowers.
  • Flame of the Forest/Palash Tree is such a tree when it is in its fullest beauty, it can change the view of the entire forest in a very graceful way.
  • From the month of January to March, the tree stands in all its glory with a lot of orange and vermilion flowers that cover the entire crown.
  • Palash trees are distinct as they have more flowers than leaves. This is the state flower of Madhya Pradesh as well as Jharkhand. 
  • Flame of the Forest/ Palash Tree is a medium-sized tree of around 6-12m in height.

Important Points

• Mahua:
  • ​Mahua flowers have many medicinal properties and are also used to make pickles, jams, and now ice creams as well.
• Khejri:
  • ​Khejri is one of the most common tree species found in India (in the dry regions of Rajasthan, Delhi, Gujarat, Punjab, and Madhya Pradesh), Afghanistan, Iran, and Pakistan.
  • It plays a vital role in preserving the ecosystem of arid and semi-arid areas, mainly in the Thar Desert.​

The correct answer is Red.

Key Points

• Sulphuric acid is also known as oil of vitriol.
• It is composed of sulfur, hydrogen, and oxygen element.
• The acid has a very strong acidic nature.
• It has several uses such as fertilizer manufacture, mineral processing, oil refining, and wastewater processing.
• It is also known by the name hydrogen sulfate.

Important Points 

• The litmus solution is a purple dye solution.
• It is extracted from the plant called " Lichen".
• It is used as an acid-base indicator.

The pattern followed here is:

According to the alphabetical positions of the letters,

Hence, ‘JAK’ is the correct answer.