Question Discussion & Solution

The correct answer is Methane.

Key Points

• Methane (CH4)
  • It is the simplest hydrocarbon consisting of one carbon atom and four hydrogen atoms and the simplest hydrocarbon, is the most abundant hydrocarbon pollutant.
  • It is a powerful greenhouse gas.
  • Major natural sources of methane include emissions from wetlands, and oceans and from the digestive processes of termites.
  • Methane is more than 25 times as potent as carbon dioxide at trapping heat in the atmosphere.

Additional Information

• Butane is a gaseous component (at room temperature and atmospheric pressure) of the Alkane group having the chemical formula is C4H10.
• It is a colourless, highly flammable, and easily liquefied gas.
• In the abundance of oxygen, it forms Carbon dioxide, but if limited oxygen is available, then it forms Carbon Monoxide.

2C4H10 + 13O2 → 8CO2 + 10H2O                   (oxygen in plenty)

2C4H10 + 9O2 → 8CO + 10H2O                      (oxygen is limited)

• Uses –
  • Gasoline blending
  • Fuel gas
  • Fragrance extraction solvent
  • Feedstock for the manufacture of ethylene and butadiene
  • Ingredient for synthetic rubber
  • Isobutane to enhance the Octane number of gasoline in refineries.
• A propane molecule has three carbon atoms and eight hydrogen bonds and has the formula C3H8. 
• Propane is a colourless, easily liquefied, gaseous hydrocarbon (compound of carbon and hydrogen) and the third member of the paraffin series following methane and ethane.
• Propane is produced as a by-product of two other processes, natural gas processing and petroleum refining.
• It is separated in large quantities from natural gas, light crude oil, and oil-refinery gases and is commercially available as liquefied propane or as a major constituent of liquefied petroleum gas (LPG).
• Uses: 
  • It is used in LPG, also used as biofuel in buses and taxis and it is also the main gas in blowtorches and for hot air balloons.
  • Propane gas has become a popular choice for barbecues and portable stoves because its low boiling point makes it vaporize as soon as it is released from its pressurized container.
• The chemical formula of Ethane is C2H6.
• It is a colourless, odourless gas at normal temperature and pressure.
• It is extracted from natural gas on an industrial scale and is a petrochemical by-product of petroleum refining.
• Michael Faraday first synthesized it in 1834, using the electrolysis of a solution of potassium acetate.

The correct answer is Typhoid. 

Key Points

• Typhoid is a bacterial infection that can lead to a high fever, diarrhea, and vomiting.
• It can be fatal.
• It is caused by the bacteria Salmonella typhi.
• The infection is often passed on through contaminated food and drinking water, and it is more prevalent in places where handwashing is less frequent.

Additional Information

• Malaria- Malaria is caused by the Plasmodium parasite. The parasite can spread to humans through the bites of infected female Anopheles mosquitoes.
• Chikungunya- Chikungunya is a viral disease. It spread to humans through the bites of infected Aedes aegypti and Aedes albopictus mosquitoes.
• Filariasis- Filariasis is a parasitic infection with a type of roundworm. It spread to humans through the bites of infected Culex, Aedes, and Anopheles mosquitoes. 

Given,

Given Expression: 70S7P21R2Q15

According to question :

=70 ÷ 7 + 21 × 2 – 15

Using BODMAS rule,

=10 + 21 × 2 – 15

= 10 + 42 – 15

= 52 – 15

= 37

Hence, value of the given expression is ‘37’.

The correct asnwer is Bikaner.

• The annual fair of Kolayat is organized in Bikaner, Rajasthan.
  • It is also called the Kapil Muni Mela.
  • It is organized in the Bikaner district of Rajasthan.
  • The fair is organized at the bank of the Kolayat river.
  • The fair is organized in the month of Karthik of the Hindu Calendar.

Additional Information

Fairs of Rajasthan

First is managed by the second.

Thus, Jailor is the related to prison.