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प्रश्न
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Oxygen is a ______ in respiration.
उत्तर
Oxygen is a reactant in respiration.
संबंधित प्रश्न
Give reason.
Acidic soil is treated with quick lime.
TRUE \ FALSE
Copper can displace iron from iron sulphate.
Fill in the blank:
The substances which undergo chemical change are called _______
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
Give reason for the following:
A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.
State the following reaction represent oxidation or reduction.
\[\ce{Ag->Ag+}\]
State the following reaction represent oxidation or reduction.
\[\ce{Al->Al+++}\]
Limestone contains ______ mainly.
A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
A chemical change may involve –
