Question Discussion & Solution

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.

The input device is any hardware used by a human operator or other systems to communicate with a computer. 

Input Device: A piece of equipment/hardware that helps us enter data into a computer is called an input device. 

Examples of an Input device:

Keyboard, mouse, scanner, joystick, etc.

Additional Information

The correct answer is Pituitary Gland.

Key Points

• Pituitary Gland
  • The pituitary gland is a small, bean-shaped gland situated at the base of the brain.
  • It is the master gland of the body.
  • It is the smallest endocrine gland in the human body.
  • It releases hormones that regulate important functions such as growth, blood pressure, and reproduction.

Additional Information

• Thyroid Gland
  • The thyroid gland is a butterfly-shaped organ located at the base of the neck.
  • It releases hormones that control metabolism- the way body uses energy.
  • It is the largest endocrine gland in the human body.
• Adrenal Gland
  • The adrenal gland, also known as suprarenal glands, are small, triangular-shaped glands located on top of both kidneys.
  • It produces hormones that help regulate your metabolism, immune system, blood pressure, response to stress, and other essential functions.
• Thymus gland
  • The thymus gland is a small organ behind the breastbone that plays an important function both in the immune system and endocrine system.
  • It is only active until puberty, after puberty the thymus gland starts to slowly shrink and become replaced by fat.

The correct answer is Pavo cristatus.

Foot, Mile and Light year are unit of Length except Distance.