Question Discussion & Solution

The given equation is 

(10 N 5) L (4 N 4) M 6

Convert the above equation into a mathematical form.

(10 × 5) + (4 × 4) - 6

Now, solve the equation using the 'BODMAS' rule.

The 'BODMAS' rule is

Therefore, the equation becomes

⇒ 50 + 16 - 6

⇒ 60

Hence, the correct answer is 60.

A cage is meant to keep something surrounded, so enclosure is the essential element. A prisoner (choice b) or an animal (choice c) are two things that may be kept in cages, among many other things. A zoo (choice d) is only one place that has cages.

The correct answer is A) 4, B) 2, C) 1, D) 3.

Key Points

• Sodium - It can be simply cut with knife as a result of Sodium has one negatron in its valence shell. Being the primary part of that amount, it is giant size.
• Mercury is liquid at temperature. A heavy, silvery d-block component, mercury is that the solely metal that's liquid at customary conditions for temperature and pressure.
• Silver is that the sensible conductor of electricity as a result of it contains the next variety of movable atoms (free electrons). For a fabric to be an honest conductor, the electricity more experienced it should be able to move the electrons.
• Lead being metal may be a dangerous conductor of electricity and warmth. Compared to alternative metals, lead may be a poor conductor of warmth whereas gold, silver, Pt square measure sensible conductors of warmth.

If '+' means 'divide by', '-' means 'add to', '×' means 'subtract from' and '/' means 'multiply by',

[{(20 × 6) × (7 / 2)} + (3 - 2)] / 5

We put the right symbol given is the question-

= [{(20 - 6) - (7 × 2)} / (3 + 2)] × 5

Now apply BODMAS rule

= [{14 - 14} / 5] × 5

= [0 / 5] × 5

= 0

Hence, "0" is the correct answer.

The correct answer is Ethyl mercaptan.

Key Points

• The stench due to leakage from the LPG cylinder because of Ethyl mercaptan.
  • LPG gas is basically propane and butane.
  • It is odourless in its natural state.
  • The smell that you notice when there is a leak is actually the stench of an entirely different agent, called ethyl mercaptan​.
    • This substance is added to the gas when it leaves the main storage terminals.
• Hence, option 4 is correct.

Additional Information

• Methane :
  • Methane is a chemical compound with the chemical formula CH₄.
  • Methane is a one-carbon compound in which the carbon is attached by single bonds to four hydrogen atoms
  • It is a group-14 hydride and the simplest alkane and is the main constituent of natural gas.
  • It is a colourless, odourless, non-toxic but flammable gas.
  • It has a role as a fossil fuel, a member of greenhouse gas, and a bacterial metabolite.
• Butane :
  • Butane or n-butane is an alkane with the formula C₄H₁₀.
  • Butane is a gas at room temperature and atmospheric pressure.
  • Butane is a highly flammable, colourless, easily liquefied gas that quickly vaporizes at room temperature.
  • Butane is a hydrocarbon and a highly flammable, colourless, odourless, easily liquefied gas.
  • It is typically used as fuel for cigarette lighters and portable stoves, a propellant in aerosols, a heating fuel, a refrigerant.
• Propane :
  • Propane is a three-carbon alkane with the molecular formula C₃H₈.
  • It is a gas at standard temperature and pressure, but compressible to a transportable liquid. 
  • Propane is a flammable hydrocarbon gas that is liquefied through pressurization and commonly used for fuel in heating, cooling, hot water, and vehicles.
  • Propane can also be used for refrigerants, aerosol propellants, and petrochemical feedstock.​