Advertisements
Advertisements
प्रश्न
Tick (√) the correct alternative from the choice given for the following statement.
Sand is a compound of
विकल्प
silicon and nitrogen
silicon and oxygen
oxygen and sulphur
none of the above
Advertisements
उत्तर
silicon and oxygen
APPEARS IN
संबंधित प्रश्न
Why is it necessary to separate the constituents of a mixture.
Indicate whether the following statement is true or false:
All elements are artificially prepared
Draw a labelled diagram of an atom including its nucleus, orbits & their contents.
Elements are classified into – Metals – Non-metals – Metalloids – Noble gases. State which of A, B, C, D is a –
1. Metallic element
2. Non-metallic element
3. Metalloid
4. Noble gas.
A: Is non-malleable, non-ductile & a poor conductor of electricity ___________
B: Has lustre, is malleable and ductile & a good conductor of heat ___________
C: Is unreactive and inert and present in traces in the air _________
D: Shows properties of both metals and non-metals ___________
Complete the statement given below by filling in the blanks with the correct words.
From the elements – He, Br, Pt, and O; the element which is metallic is ____, an inert element is ____, forms a triatomic molecule is ____, is liquid at room temperature is_ ___.
With reference to elements – define the term ‘molecule’. Give two examples each of a monoatomic, diatomic & polyatomic molecule.
Define the term ‘compound’. In the compound carbon dioxide – the elements carbon & oxygen are combined in a fixed ratio. Explain.
Give a reason for the following statement :
The filter paper made into a cone & placed in a funnel for filtering out the solid particles in a solid-liquid mixture should be moistened before placing it.
Classify the following as elements and compounds.
Water, Common salt, Sugar, Carbon dioxide, Iodine and Lithium
How are elements classified?
