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प्रश्न
Select the correct answer from the choice in the bracket.
The least reactive metal.
पर्याय
magnesium
silver
copper
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उत्तर
silver
APPEARS IN
संबंधित प्रश्न
Write true or false
A heterogeneous mixture has a uniform composition throughout the mixture
Is food that we eat a mixture ?
Name: a Liquid Non-metal
Define a pure substance. How many types of pure substances do you know?
Give two examples of the following.
Metals which are soft
State the number of atoms of C6H12O6
State the number of atoms of CaCO3
Fill in the blank
A metal which is a liquid at room temperature is _______.
Tick (√) the correct alternative from the choice given for the following statement.
Brass and bronze are
Complete the statement – an element is a pure substance made up of ____________ atoms.
Complete the statement given below by filling in the blank with the correct word.
From the elements nitrogen, chlorine, bromine, the element present in the atmosphere is ________.
Match the statements in List I – 1 to 10 correct answers in List II-A to J.
| List I | LIst II | ||
| 1 | Fluorine and chlorine | A | Nitrogen |
| 2 | A diatomic molecule | B | Boron |
| 3 | A molecule containing the elements hydrogen and oxygen. | C | Reactants |
| 4 | A metalloid - showing properties of both metals and non-metals. | D | Chemical Formula |
| 5 | The term used for the substances which take part in the chemical reaction | E | Halogens |
| 6 | The term represents a substance by means of symbols. | F | Water |
| 7 | The term used for the substances formed as a result of a chemical reaction | G | Nitric Acid |
| 8 | A compound containing one atom of zinc and two atoms of chlorine. | H | Products |
| 9 | The chemical name for nitrogen monoxide. | I | Phosphorus |
| 10 | A polyatomic molecule. | J | Zinc Chloride |
Select the correct answer from the choice given below.
The type of molecule- bromine
Select the correct answer from the choice given below to complete the sentence :
An example of a monoatomic molecule is ___________.
There are ______ number of known elements.
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.
Match the following.
| Atom | Building block of matter |
| Element | Atoms of different kinds |
| Compound | Atoms of the same kind |
| Molecule | Smallest unit of a substance |
Match the following:
| 1. | Co2 | a. | Robert Boyle |
| 2. | Sulfur | b. | Making mobile phones |
| 3. | Element | c. | triatomic molecule |
| 4. | Gallium | d. | Polyatomic molecule |
Name the two elements which are derived from the country.
