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प्रश्न
Fill in the blank
Chalk powder dissolved in water is an example of a Chalk powder dissolved in water is an example of a _________.
उत्तर
Chalk powder dissolved in water is an example of a Chalk powder dissolved in water is an example of a suspension.
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संबंधित प्रश्न
What is the difference between a pure substance and a mixture ?
Name: a Metal Which is brittle
Give two examples of Non-metals.
State the number of atoms of CaCO3
Name: Two substances used to make jewellery.
Answer the following question:
Give the advantages of using symbols instead of names of elements or compounds.
Indicate whether the following statement is true or false:
Molecules combine to form atoms
Tick (√) the correct alternative from the choice given for the following statement.
The compound used as common salt is
Differentiate between the terms –
elements, compounds & mixtures.
State what are radicals. Give the names of the radicals –
(a) NO3
(b) OH
(c) SO4
(d) CO3
Complete the statement given below by filling in the blank with the correct word.
The basic unit of an element is an __________.
Match the compounds in List I – 1 to 20 with their correct formulas from in List II-A to T.
| List I | List II | ||
| 1 | Hydrochloric acid | A | NaCI |
| 2 | Potassium Hydroxide | B | NaOH |
| 3 | Sulphuric Acid | C | KCI |
| 4 | Zinc Hydroxide | D | Ca(OH)2 |
| 5 | Sodium Chloride | E | CaS |
| 6 | Nitric Acid | F | CuSO4 |
| 7 | Calcium Hydroxide | G | CaCO3 |
| 8 | Carbonic Acid | H | NH4CI |
| 9 | Sodium hydroxide | I | HCI |
| 10 | Copper sulphate | J | ZnO |
| 11 | Potassium Chloride | K | HNO3 |
| 12 | Calcium Carbonate | L | H2CO3 |
| 13 | Magnesium Sulphide | M | MgS |
| 14 | Zinc Sulphate | N | MgO |
| 15 | aluminium Hydroxide | O | KOH |
| 16 | Sodium Carbonate | P | ZnSO4 |
| 17 | Calcium Sulphide | Q | Na2CO3 |
| 18 | Magnesium Oxide | R | H2SO4 |
| 19 | Zinc Oxide | S | AI(OH)3 |
| 20 | Ammonium Chloride | T | Zn(OH)2 |
Explain the difference between Atoms and molecules.
‘An atom is the basic unit of an element’. Draw a diagram of an atom – divisible as seen today.
Explain the term ‘mixture’.
Select the correct answer from A, B, C, D & E for the statement given below :
A non-metal that is lustrous.
Select the correct answer from the choice given below to complete the sentence :
Dust in air is an example of _________ mixture.
The first letter of an element is always written in ______ letter.
Give an example for the elements derived from their Latin names.
Complete the table by writing the symbols of the following elements
| Element | Symbol |
| Aluminum | Al |
| Nickel | |
| Bromine | |
| Helium | |
| Magnesium |
