Practice Test

Which of the following was not explained by Dalton's atomic theory?

1. Laws of chemical combination
2. Laws of conservation of mass
3. Laws of constant composition
4. Laws of multiple proportions

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Why do chips manufacturers usually flush bags of chips with a gas such as nitrogen?

Consider the following statements on Biodiesel:

1. It is obtained from sugar cane and sugar beets.
2. Biodiesel fuel can be used in diesel engines only after altering the engine.
3. It produces lower levels of most air pollutants than petroleum-based diesel fuel.

Which of the statements given above is/are correct?

Which of the following may be observed when a chemical reaction takes place?

1. Change in color
2. Evolution of a gas
3. Change in temperature

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Consider the following statements:

1. Caffeine, a constituent of tea and coffee is a diuretic.
2. Citric acid is used in soft drinks.
3. Ascorbic acid is essential for the formation of bones and teeth.
4. Citric acid is a good substitution for ascorbic acid in our nutrition.

Which of the statements given above are correct?

Which of the following statements is/are correct about Chromium?

1. It has a shiny appearance.
2. It does not corrode.
3. It resists scratches.

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Which of the following are the uses of hydrogen peroxide (H₂O₂)?

1. Bleaching agent for textiles.
2. Mild disinfectant.
3. Sodium based detergents.
4. Coal gasification.

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Which one among the following is a form of carbon?

1. Graphite
2. Fullerene
3. Quartz

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