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A certain non-metal X forms two oxides A and B. The mass percentage of oxygen in oxide A (X4O6) is 43.7%, which is the same as that of X in the oxide B. What will be the formula of the oxide B?Topic: Chemistry
Assume the gases are ideal. What are the mole fraction of N2, O2 and H2O in the most air?Topic: Chemistry
Atomic mass of carbon is 12 u. One atom of magnesium is twice as heavy as one carbon atom. How should I calculate the atomic mass of magnesium?Topic: Chemistry
Which one of the following pairs is not correctly matched?Topic: Chemistry
A sample of chloroform before using as an anaesthetic, is tested byTopic: Chemistry
Acid rains is caused due to emission of which of the following into the atmosphere?Topic: Chemistry
Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?Topic: Chemistry
What is the role of ultraviolet (UV) radiation in the water purification system?
1. It inactivates / kills the harmful micro- organisms in water.
2. It removes all the undesirable odours from the water.
3. It quickens the sTopic: Chemistry
Domestic cooking gas consists of mostlyTopic: Chemistry
Consider the following statements:
Hard water is not suitable for
2. Washing clothes with soap
3. Use in boilers
4. Irrigating crops
Which of these statements are correct?Topic: Chemistry
Living in the atmosphere of CO is dangerous because itTopic: Chemistry
Biogas mainly consists ofTopic: Chemistry