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प्रश्न
Select the correct answer to the statement given below:
The chemical name for dinitrogen oxide [N20].
पर्याय
Chalk
Oxygen
Silicon
Bromine
Nitrous oxide
उत्तर
Nitrous oxide
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संबंधित प्रश्न
Define: Elements
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
Write true or false
A heterogeneous mixture has a uniform composition throughout the mixture
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Marble
Give two examples of the following.
Non-metals which are solids
Give one use of the following substance:
Brass
Fill in the blank
A liquid non-metal is _______.
Indicate whether the following statement is true or false:
Molecules combine to form atoms
Indicate whether the following statement is true or false:
Noble gases are high reactive
Tick (√) the correct alternative from the choice given for the following statement.
Sugar is a compound which consists of the elements
Complete the statement given below by filling in the blank with the correct word.
An element is a pure substance which cannot be broken down by physical or _________ methods.
Select the correct answer from the choice given below.
The negatively charged particles in an atom
Who are my companions?
| Group 'A' | Group 'B' |
| 1. Stainless steel | (a) Non-metal |
| 2. Silver | (b) compound |
| 3. Bhajani mixture for milling | (c) Mixture |
| 4. Salt | (d) Element |
| 5. Coal | (e) Alloy |
| 6. Hydrogen | (f) Metal |
Explain the difference between Atoms and molecules.
Write an answer to the following question in your own words.
Which elements (metals and non-metals), compounds and mixtures do we use in our day-to-day life?
Select the correct answer to the statement given below:
A metalloid
Give a reason for the following statement:
Components in a mixture are present in varying proportions and not in a fixed proportion.
State why brass is considered as a homogenous mixture while a mixture of iron & sulphur – heterogenous.
Why are utensils made up of aluminium and brass?
An element is sonorous and highly ductile. Under which category would you classify this element? What other characteristics do you expect the element to possess?
