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प्रश्न
Give the name of the radical - OH
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उत्तर
OH – hydroxide
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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
Give one example for the following types of mixtures :
solid-liquid heterogenous mixture.
Classify the following substances into elements and compounds
Mercury, sulphur, sugar, water, sand, gold, carbon, oxygen, alcohol, iron, marble, baking soda.
What is meant by 2H and H2
Complete the statement given below by filling in the blank with the correct word.
The basic unit of an element is an __________.
‘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.
Select the correct answer from A, B, C, D & E for the statement given below :
A metalloid.
Complete the table by writing the symbols of the following elements
| Element | Symbol |
| Aluminum | Al |
| Nickel | |
| Bromine | |
| Helium | |
| Magnesium |
Reason out
Elements are called semimetals.
