Question Discussion & Solution

Concept:

• Electric current is the rate of flow electric charge or free Electrons in a definite direction through any section of wire. Its SI unit is ampere(A).
• The direction of the conventional current corresponds to the direction of positive charge which is from higher potential(positive) to lower potential(negative).

I = Q / t

I is current, Q is charge, t is time

Explanation:

Q = I t

So Charge is the product of current and time.

Unit of current is Ampere, and unit of time is an hour. 

So, Amount of charge or Quantity of electricity is Ampere-hour 

The correct answer is Jai Narayan Vyas University.

• Jai Narayan Vyas University was named after the third Chief Minister of Rajasthan.

Key Points

• Jai Narayan Vyas was the 3^rd Chief Minister of Rajasthan.
• His tenure was from April 1951 – 3 March 1952.
• He was associated with Indian National Congress.
• Jai Narayan Vyas University is located in Jodhpur.
• It was earlier known as the University of Jodhpur.
• It was established in 1962.

Additional Information

• About Rajasthan (as of Nov 2021)
  • CM: Ashok Gehlot
  • Governor: Kalraj Mishra
  • State flower: Rohira (Tecomella undulata)
  • State Animal: Chinkara
  • National Parks and Wildlife Sanctuaries: Ranthambore National Park, Sariska Tiger Reserve (Native wildlife & tiger sanctuary), Desert National Park, Mount Abu WS.
  • Highest Peak: Guru Sikhar (1732 mt)
  • Important river: Chambal and Luni (Inland river)
  • UNESCO site: Chittorgarh Fort, Kumbhalgarh, Ranthambore Fort, Amber Fort.

Let the three consecutive numbers be x, x + 1, x + 2

⇒ x + (x + 1) + (x + 2) = 345

⇒ 3x + 3 = 345

⇒ 3x = 345 – 3 = 342

\(\Rightarrow x = \frac{{342}}{3} = 114\)

So the three consecutive numbers are 114, 115 and 116. And the middle number is 115.

The correct answer is Soap solution is alkaline.

Concept:

• Indicators are the substances that are used to identify whether the given substance is an acid or a base.
• There are two types of indicators:
  • Natural: These indicators are obtained from natural sources like plants. 
  • Turmeric, litmus, china rose petals, etc., are some of the naturally occurring indicators.
  • The most commonly used natural indicator is litmus.
  • It is extracted from lichens.
  • It is available in the form of a solution, or in the form of strips of paper, known as litmus paper.
  • Generally, it is available as red and blue litmus paper.
  • Man-made: Phenolphthalein, Methyl orange are some of the man-made indicators.

Explanation:

• • The indicators change their colour when added to a solution containing an acidic or a basic substance.
  • Turmeric is a natural indicator. It contains the substance

curcumin which changes colour with pH.

• When a substance is basic, the colour is red, whereas when the substance is acidic, the colour of turmeric turns yellow to brown

• Turmeric stains on the shirt turn red when washed with soap because the soap solution is basic in nature which changes the yellow colour of Turmeric into red colour.
• It is because turmeric contains tartaric acid, while the soap contains a sodium hydroxide base. When an acid reacts with a base, a neutralization reaction takes place and the stain becomes neutral.

Neutralization Reaction

• A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form salt and water as products.

Saponification

• Saponification is the hydrolysis of an ester with NaOH or KOH to give alcohol and sodium or potassium salt of the acid.

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