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प्रश्न
Fill in the blank:
Manganese dioxide acts as a _________.
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उत्तर
Manganese dioxide acts as a catalyst.
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संबंधित प्रश्न
The most abundant element in the earth’s crust.
An oxide and a carbonate containing oxygen.
Why is oxygen collected by downward displacement of water?
Fill in the blanks:
Oxygen is collected by the __________ displacement of ________.
Fill in the blank space by choosing the correct word from the given list.
List: sulphurous, nitric acid, red lead oxide paint, oxygen, phosphoric
Potassium nitrate crystals on heating strongly yield potassium nitrite and ________ gas.
Write ‘True’ or ‘False’ in front of following statement.
Under laboratory conditions, the oxygen gas is insoluble in water.
Tick (√ ) the most appropriate answer.
When sulphur burns in oxygen, the colour of the flame is :
Write fully balanced equation for the following :
Na2O + H2O →
Give reasons for the following:
oxygens finds utility in welding & cutting of metals.
Phosphorous bums with suffocating smell and gives ______.
