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प्रश्न
Select the correct answer to the statement given below:
A compound containing carbon, oxygen and calcium.
विकल्प
Chalk
Oxygen
Silicon
Bromine
Nitrous oxide
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उत्तर
Chalk
APPEARS IN
संबंधित प्रश्न
Give one example for the following type of mixtures
solid-solid homogenous mixture.
Fill in the blank
Chalk powder dissolved in water is an example of a Chalk powder dissolved in water is an example of a _________.
Match the columns.
| column A | column B |
|
1. to separate grain from chaff |
a. filtration |
| 2. to saparate sawdust from water | b. sedimentation and deeantation |
| 3. to separate iodine from sodium chloride | c. winnowing |
| 4. to separate iron fillings from sand | d.sublimation |
|
5. it is used to separate sand and water |
e maganetic separation |
|
|
f .handpicking |
How is sodium chloride different from its constituent elements, sodium and chlorine in its properties? Justify.
Answer the following question:
Why are copper and aluminium used to make electric wires?
Find the atomicity of the Following molecule:
Aluminium Suiphide
Tick (√) the correct alternative from the choice given for the following statement
A gaseous non-metal.
Complete the statement with the correct words.
__________ are chemicals formed on reaction of a base with an _____ giving salt and water.
Select the correct answer from the choice given below.
A group of atoms of elements
Represent with the help of a simple chart how matter is classified into pure or impure substances & further into elements, compounds & mixtures, with elements further segmented.
‘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.
Give three differences between elements & compounds with relevant examples.
Select the correct answer from the choice given below to complete the sentence :
Compounds are ____________ in nature.
Elements are made up of______ kinds of atoms.
Non-metal conducting electricity :______ :: Metal conducting electricity : Copper
Water contains _____ and _____ element.
______ is the life-giving element is the air.
What is the Latin name of Sodium?
Higher-Order Thinking questions:
Why is hydrogen considered an element?
Name the two elements which are derived from the country.
