Question Discussion & Solution

1 atm is equal to 760 torr.

• The atmospheric pressure(atm) is unit of the pressure within the atmosphere of Earth. 
• At sea level the Earth's atmospheric pressure is 1 atm.
• The torr is an absolute-scale which is unit of pressure.
• The unit took its name from Evangelista Torricelli, an Italian physicist and mathematician who invented the barometer theory in 1644.

The correct answer is 1 i.e. propanal.

Concept:

IUPAC nomenclature:

• A systematic method of naming organic compounds.
• Naming is based on their structures.
• It is devised by the International Union of Pure and Applied chemistry.
• Many rules are followed while naming the compounds and it is different for different functional groups.
• The rules are known as IUPAC rules.

Explanation:

• This compound contains 3 carbon atoms, so its parent alkane is propane.
• It also contains an aldehyde group (-CHO-) group which is indicated by using 'al' as suffix or ending.
• So by replacing the last 'e' of butane with 'al', the name becomes propanal.
• Thus, the IUPAC name of the compound CH3CH2CHO is propanal.
• The common name of propanal is Propionaldehyde.

​Additional Information

• The chart for priority order and suffix name is given below:

The logic is,

In the first image, there are six lines in the first column and there is a four-sided figure in the second column.

In the second image, there are eight lines in the first column and there is a six-sided figure in the second column.

So, it means that the number of sides of a figure in the second column is decreasing by two from the number of lines in the first column.

Since, in third image there are five lines so the answer figure must be a three-sided figure.

Thus, the correct figure is as follows:

The correct answer is Rakesh Sharma.

Key Points

• Rakesh Sharma is the first Indian to enter space.
  • He was selected as a cosmonaut for a joint Soviet-Indian spaceflight in 1982.
  • He made history by becoming the first Indian to travel to space in 1984.
  • He flew on Soyuz T-11 with commander Yury Malyshev and flight engineer Gennady Strekalov, to the space station Salyut 7 on 3^rd April 1984.
  • Rakesh Sharma and his crewmates landed in Kazakhstan on 11^th April 1987 after the successful completion of the mission.
  • He is the only Indian citizen to travel in space.

Additional Information

• Kalpana Chawla was the first Indian-origin woman to enter space.
  • She was killed in the space shuttle Columbia disaster on 1st February 2003.
• Sunita Williams is the second Indian-origin woman to enter space.
  • The first marathon in space was run by Sunita Williams.
• Yuri Gagarin is the first man to enter space.
• Ravish Malhotra was an Air Force test pilot in India. 
  • He served as a backup for Rakesh Sharma on the Soyuz T-11 mission.

The correct answer is Gypsum.

• Gypsum is available in the Nagaur district in a significant amount.

Key Points

• Nagaur is the fifth largest district in Rajasthan.
• Gypsum is composed of calcium sulphate (CaSO₄) and water (H₂O).
• Its chemical name is Calcium Sulphate Dihydrate (CaSO₄. 2H₂O).

Additional Information

• Beryllium is found in the Ajmer and Udaipur mines of Rajasthan.
• Copper is found in the Khetri copper belt in Rajasthan.
• Silver is found in Zawar mines in Udaipur.