Download App

Carbon and its Compounds — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceCarbon and its Compounds2 Marks
Question
Explain the formation of scum when hard water is treated with soap.
✓

Answer

When soap is used for washing clothes with hard water, a large amount of soap in water reacts with the calcium and magnesium ions of hard water to form an insoluble precipitate called scum. This makes the cleaning of clothes difficult.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[2 Mark Questions]" from Carbon and its Compounds→Carbon and its Compounds — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

  1. How do you calculate the possible valency of an element from the electronic configuration of its atoms?
  2. Calculate the valency of an element X whose atomic number is 9.
→
Microorganisms are often referred to as the 'scavengers of the environment.' Explain.
→
Why can’t two field lines intersect each other?
→
What name is given to:
  1. All the petals of a flower.
  2. All the sepals of a flower?
→
An object lies at a distance of 2f from a concave lens of focal length f. Draw a ray-diagram to illustrate the image formation.
→
A man can read the number of a distant bus clearly but he finds difficulty in reading a book.A man can read the number of a distant bus clearly but he finds difficulty in reading a book.
  1. From which defect of the eye is he suffering?
  2. What type of spectacle lens should he use to correct the defect?
→
Write down a formula for the magnification produced by a concave mirror.
  1. In terms of height of object and height of image.
  2. In terms of object distance and image distance.
→
Why is soap not suitable for washing clothes when the water is hard?
→
Explain why, diamond can be used in rock drilling equipment but graphite cannot.
→
Give reasons:
The colour of blue copper sulphate crystals changes to white on heating.
→