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प्रश्न
Select the correct answer to the statement given below:
A metalloid
पर्याय
Chalk
Oxygen
Silicon
Bromine
Nitrous oxide
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उत्तर
Silicon
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संबंधित प्रश्न
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
Fill in the blan
An ________ is a homogeneous mixture of two or more metals.
Is food that we eat a mixture ?
Tick the most appropriate answer.
How many times is a proton heavier than an electron?
- 1500
- 1800
- 1840
- none of these
Name: the Hardest Naturally Occurring Substance
Give one use of the following substance:
Coal
Fill in the blank
_________ refers to the number of atoms in the molecule of an element
Fill in the blank
A metal which is a liquid at room temperature is _______.
Indicate whether the following statement is true or false:
Metals can be polished.
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
The most ductile metal.
Differentiate between the terms –
elements, compounds & mixtures.
Give the name of the radical - OH
Complete the statement with the correct words.
_______ are chemicals which are hydroxide (or oxides) of ______ eg. sodium hydroxide.
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 |
Write the names of elements from the following symbol:
Ti
Write the names of elements from the following symbol:
Ir
Define the term ‘compound’. In the compound carbon dioxide – the elements carbon & oxygen are combined in a fixed ratio. Explain.
Oxygen is very essential for us to live. It forms 21% of air by volume. Is it an element or compound?
______ is a mixture of gases.
