Advertisements
Advertisements
Question
How is the impurity of iron present in several substances removed in industries ?
Advertisements
Solution
The impurity of iron present in several substances in the industries is removed using electromagnets. Waste materials supplied to the industries contain a number of scrap metals including iron.
Iron objects stick to the electromagnet and are collected at a separate place, leaving behind other objects.
APPEARS IN
RELATED QUESTIONS
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
Name two solid, two liquid and two gaseous elements at the room temperature.
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
- What type of substance is C ?
- Name the gas (i) D, and (ii) E ?
- State one characteristic property of gas D.
- Write one test to identify gas E.
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
What is the most common way of expressing the concentration of a solution ?
How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?
Choose the correct answer.
A 15% alcohol solution means :
Explain what happens when a beam of light is passed through a colloidal solution.
One of the following represents the solution of solid in a solid. This one is :
Name the process by which common salt is purified.
How is scrap iron separated from a heap of waste materials in factories?
How will you separate iron pins from sand ?
Describe the method of separating a mixture containing common salt, sand and ammonium chloride.
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
Differentiate between the-two characteristics of matter – ‘mass’ & ‘weight’.
Define the term matter.
Define the term matter.
Define the term matter.
