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प्रश्न
Fill in the blank
The most abundant element in the atmosphere is _______.
उत्तर
The most abundant element in the atmosphere is nitrogen.
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संबंधित प्रश्न
Tick the most appropriate answer.
How many times is a proton heavier than an electron?
- 1500
- 1800
- 1840
- none of these
State the number of atoms of each element, present in \[\ce{HNO3}\].
Also name the compound.
Give one use of the following substance:
Iron
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 with the correct words.
_______ are chemicals which are hydroxide (or oxides) of ______ eg. sodium hydroxide.
Define the terms elements, compounds & mixtures with a view to show their basic difference.
Non-metal conducting electricity :______ :: Metal conducting electricity : Copper
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which is required for combustion.
What is the Latin name of Sodium?
Give an account of elements known to us.
