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प्रश्न
Select the correct answer to the statement given below:
A metalloid
पर्याय
Chalk
Oxygen
Silicon
Bromine
Nitrous oxide
उत्तर
Silicon
APPEARS IN
संबंधित प्रश्न
Give two examples for the following: Metals
Write true or false
A heterogeneous mixture has a uniform composition throughout the mixture
Give Two Examples for Each of the Following: Inert Gases
State four differences between compounds and mixtures.
Name: a non-metal which is lustrous
Fill in the blank
The most abundant element in the atmosphere is _______.
Match the Columns:
| Column A | Column B | ||
| (a) | Metals | (i) | Non-Reactive |
| (b) | Molecules | (ii) | Brittle |
| (c) | Non-Metals | (iii) | Lustrous |
| (d) | Noble Gases | (iv) | Smallest unit of Compound |
Indicate whether the following statement is true or false:
Ozone is a triatomic molecule
Complete the statement with the correct words.
Acid’s are chemicals which are _____ in taste and derived from plants and ________.
Select the correct answer from the choice given below.
The unreactive non-metallic element
Select the correct answer from the choice given below.
The negatively charged particles in an atom
Write the names of elements from the following symbol:
Xe
Define the terms elements, compounds & mixtures with a view to show their basic difference.
‘The modern periodic table consists of elements arranged according to their increasing atomic numbers’. With reference to elements with atomic numbers 1 to 20 only in the periodic table – differentiate them into – metallic elements, metalloids, non-metals & noble gases.
Define the term ‘compound’. In the compound carbon dioxide – the elements carbon & oxygen are combined in a fixed ratio. Explain.
Differentiate between homogenous & heterogeneous mixtures.
Elements are the______ form of pure substances.
Assertion: Air is a mixture of elements only.
Reason: Only nitrogen, oxygen and neon gases exist in air.
Give an example of each mixture having the following characteristics. Suggest a suitable method to separate the components of this mixture
Two or more coloured constituents are soluble in some solvent.
Complete the table:
| Element | Latin Name | Symbol |
| Mercury | ______ | Hg |
| Lead | Plumbum | ______ |
| Iron | ______ | Fe |
| Potassium | Kalium | ______ |
