Advertisements
Advertisements
प्रश्न
Write the names of elements from the following symbol:
Si
उत्तर
Si- Silicon
संबंधित प्रश्न
Classify the following substances into compounds and mixtures:
Give Two Examples for Each of the Following: Inert Gases
Differentiate between:
Homogenous and heterogenous substances
Give two examples of Metals.
Fill in the blank
The most abundant element in the earth’s crust is _______.
Tick (√) the correct alternative from the choice given for the following statement.
Atoms of different kinds combine to form molecules of
Complete the statement with the correct words.
_______ are chemicals which are hydroxide (or oxides) of ______ eg. sodium hydroxide.
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 |
Give a reason for the following statement:
Components in a mixture are present in varying proportions and not in a fixed proportion.
Atoms: Fundamental particle of an element::______ : Fundamental particles of a compound.
