Advertisements
Advertisements
प्रश्न
Which one of the following scrap metal cannot be separated by magnetic separation ?
विकल्प
nickel
cobalt
chromium
steel
Advertisements
उत्तर
chromium
Chromium does not have magnetic property. Therefore, it will not be attracted by a magnet.
APPEARS IN
संबंधित प्रश्न
Intermolecular force of attraction is maximum in ............ less in .......... and the least in .............
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
State two physical properties on the basis of which metals can be distinguished from non-metals.
Which of the following is not an element ?
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 difference between colloids and suspensions ?
One of the following represents the solution of solid in a solid. This one is :
Which technique can be used to detect and identify traces of poison present in the stomach wash of a person ?
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
Describe a method to separate a mixture of camphor and sand.
How will you separate a mixture of iron filings and powdered carbon ?
Explain how, impure copper sulphate can be purified by crystallisation.
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
The dyes present in fountain pen ink can be separated by the technique of :
Pure copper sulphate can be obtained from an impure sample by the process of :
Asmita went to buy an earthen pot. There she saw many things kept for sale.
How did she identify what she needed?
Atoms are tiny particles that repel each other when they are squeezed very close.
