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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement.
All pure substances have
विकल्प
the same physical state
the same colour
the same composition
a definite set of properties
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उत्तर
a definite set of properties
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संबंधित प्रश्न
Match the columns.
| column A | column B |
|
1. to separate grain from chaff |
a. filtration |
| 2. to saparate sawdust from water | b. sedimentation and deeantation |
| 3. to separate iodine from sodium chloride | c. winnowing |
| 4. to separate iron fillings from sand | d.sublimation |
|
5. it is used to separate sand and water |
e maganetic separation |
|
|
f .handpicking |
Why is it necessary to separate the constituents of a mixture.
Answer the following question:
When iron is mixed with sulphur at room temperature, it does not form a compound. Why?
Fill in the blank
A metal which is a liquid at room temperature is _______.
Select the correct answer from the choice given below.
The negatively charged particles in an atom
‘An atom is the basic unit of an element’. Draw a diagram of an atom – divisible as seen today.
State five different characteristics of compounds.
Select the correct answer from A, B, C, D & E for the statement given below :
A metalloid.
Classify the following as metals, non-metals and metalloids.
Sodium, Bismuth, Silver, Nitrogen, Silicon, Carbon, Chlorine, Iron, Copper
Higher-Order Thinking questions:
Why is hydrogen considered an element?
