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प्रश्न
Select the correct answer from the choice in the bracket.
The least reactive metal.
पर्याय
magnesium
silver
copper
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उत्तर
silver
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संबंधित प्रश्न
Differentiate between:
Homogenous and heterogenous substances
Why is it necessary to separate the constituents of a mixture.
Write the Chemical Name of the Following and Also Give Their Molecular Formulae:
Marble
Name: a non-metal which is lustrous
Give two examples of the following.
Elements which are liquids
Name: A form of carbon used as a gem
Give one use of the following substance:
Brass
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
A non-metal which is a good conductor of electricity.
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name - a poisonous gas almost as heavy as air.
State what are radicals. Give the names of the radicals –
(a) NO3
(b) OH
(c) SO4
(d) CO3
Complete the statement with the correct words.
Acid’s are chemicals which are _____ in taste and derived from plants and ________.
Complete the statement with the correct words.
_______ are chemicals which are hydroxide (or oxides) of ______ eg. sodium hydroxide.
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_ ___.
Write the names of elements from the following symbol:
Fe
State four differences between – elements, compounds and mixtures with suitable examples.
State why brass is considered as a homogenous mixture while a mixture of iron & sulphur – heterogenous.
Oxygen is very essential for us to live. It forms 21% of air by volume. Is it an element or compound?
Give an example of each mixture having the following characteristics. Suggest a suitable method to separate the components of this mixture
Two or more coloured constituents are soluble in some solvent.
______ is the life-giving element is the air.
