Advertisements
Advertisements
प्रश्न
Which of the following is not an element ?
पर्याय
graphite
germanium
silica
silicon
Advertisements
उत्तर
Silica.
Silica is a compound made up of Si (silicon) and O (oxygen) and chemically called Silicon dioxide.
APPEARS IN
संबंधित प्रश्न
State two characteristics of matter demonstrated by Brownian motion.
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
An inflated balloon full of air goes down slowly (becomes smaller and smaller slowly) even though the knot at the mouth of the balloon is airtight. And after a week all the air has escaped from the balloon. Explain how the air particles got out of the balloon.
What is meant by saying that metals are sonorous ?
Name two solid, two liquid and two gaseous elements at the room temperature.
State any two properties for believing that aluminium is a metal.
Which of the following are not compounds ?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond
Choose the correct answer.
A 5 per cent sugar solution means that :
Explain what happens when a beam of light is passed through a colloidal solution.
Which of the following do not exhibit Tyndall effect ?
Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.
What is the effect of temperature on the solubility of solids in liquids ?
Milk of Magnesia is :
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
Explain the meaning of the term matter with special reference to the term ‘substance’.
Select the correct answer from A, B, C, D & E for the statement given below:
An atom or group of atoms _________ having a resultant charge.
The non S I and S I units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:
| (A) | (B) | ||
| (a) | degree celsius | (i) | kilogram |
| (b) | centimetre | (ii) | pascal |
| (c) | gram per centimetre cube | (iii) | metre |
| (d) | bar | (iv) | kelvin |
| (e) | milligram | (v) | kilogram per metre cube |
The physical state of water at 373 K is ______.
Compressibility of solids: ______.
