Advertisements
Advertisements
प्रश्न
Tick (√) the correct alternative from the choice given for the following statement.
Gold is used to make jewellery because
विकल्प
it is dull
lustrous and attractive
highly reactive
very cheap
Advertisements
उत्तर
lustrous and attractive
APPEARS IN
संबंधित प्रश्न
Fill in the blank
A pure substance has definite.................. and constant ..............
Tick the most appropriate answer.
The constituents of a mixture are present in
- a fixed ratio
- a variable ratio,
- the ratio of 2: 1
- none of these
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 |
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Vinegar
Name: A form of carbon used as a gem
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – a gas with a pungent, choking odour which is lighter than air
Define the term ‘compound’. In the compound carbon dioxide – the elements carbon & oxygen are combined in a fixed ratio. Explain.
Select the correct answer from A, B, C, D & E for the statement given below :
A mixture consisting of elements & a compound.
Classify the following as metals, non-metals and metalloids.
Sodium, Bismuth, Silver, Nitrogen, Silicon, Carbon, Chlorine, Iron, Copper
Higher Order Thinking Skills.
In the diagram given below, the circle, square and triangle represent the atoms of different elements.
Identify all combinations that represent
- molecule of a compound
- molecule of an element consisting of two atoms
- molecule of an element consisting of three atoms
