ICSE ICSE Class 7 - CISCE Question Bank Solutions

Fill in the blank:

Manganese dioxide acts as a _________.

Fill in the blanks:

Oxygen is collected by the __________ displacement of ________.

Fill in the blank:

Oxygen occupies about ______ of air by volume.

Fill in the blank:

Oxygen is ___________ to litmus testing.

Why is potassium chlorate is not used for laboratory preparation of oxygen ?

What happens when Sulphur burns in oxygen ? Also give the balanced chemical equation for the reaction.

What happens when Magnesium burns in oxygen ? Also give the balanced chemical equation for the reaction.

Give balanced equation to obtain oxygen from Silver oxide.

Give balanced equation to obtain oxygen from Potassium chlorate.

State the use of manganese dioxide in the laboratory prepa-ration of oxygen from potassium chlorate.

State the precautions while preparing oxygen in the labo-ratory.

How will you obtain dry oxygen in the laboratory?

How will you identify oxygen in the laboratory ?

State two characteristics of Acidic oxides.

State two characteristics of Basic oxides.

Complete and balance the following equation

S + O₂  →

Complete and balance the following equation

\[\ce{N2 + O2 ->[3000°C]}\]

Complete and balance the following equation

Al   +  O₂   →

Complete and balance the following equation

K₂O + H₂O →

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.