Foundations · Purity Basics

Impurity Transfer and Purification Rules

Test your knowledge on how impurities transfer and purification methods in Islam.

9 questions · Easy · about 5 minutes

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9 questions, about 5 minutes.

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Show questions and answers Spoilers: every answer and explanation for all 9 questions.

1. When does a liquid become impure after something impure mixes with it?

  • When the impurity remains and its effects are visible. (correct answer)
  • Whenever any impurity touches it, even with no trace.
  • Only when the liquid changes color, not smell or taste.
  • Never, because liquids always remain pure.

Why

A liquid other than water is treated like water in this ruling. If the impurity remains and its effects are visible, the liquid becomes impure. If no change occurs and no trace remains, it is deemed pure.

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2. What happens if impurity changes the taste, smell, or color of water?

  • The water becomes impure. (correct answer)
  • The water remains pure in every case.
  • The water becomes impure only if it was a small amount.
  • The water may still be used for wudu and ghusl.

Why

If impurity changes any of the water’s main characteristics — taste, smell, or color — the water is impure, whether the amount of water is large or small.

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3. Can water changed by rust still be used for purification?

  • Yes, if it is still called water. (correct answer)
  • No, rust always makes water impure.
  • Only if no other water is available.
  • Only for wudu, not ghusl.

Why

Rust is not an impure substance. If water changes because of rust or another pure substance, it remains pure and usable for purification as long as it is still called water.

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4. What is the ruling on using food or drink to remove impurity unnecessarily?

  • It is not permissible because it is wasteful. (correct answer)
  • It is recommended because food and drink clean better.
  • It is required whenever water is unavailable.
  • It is always better than using water.

Why

Impurity may be removed by different means if the impurity itself is removed. But using food or drink unnecessarily to remove impurity is not allowed because it wastes something beneficial.

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5. How can a smooth, solid object like a mirror be purified from impurity?

  • By wiping or rubbing it until no impurity remains. (correct answer)
  • Only by soaking it in water overnight.
  • Only by washing it seven times.
  • By leaving the impurity to dry.

Why

For smooth, non-absorbent objects, the correct view given is that wiping or rubbing is enough if it removes the impurity completely.

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6. What is needed for impurity to transfer from one thing to another?

  • Actual wetness. (correct answer)
  • Mere dry contact.
  • Intention.
  • Fear that impurity might be present.

Why

Dry impurity does not transfer through dry contact. Impurity transfers when there is wetness, but slight dampness alone does not necessarily mean impurity has transferred.

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7. Which impurity is described as greater impurity?

  • The saliva of a dog. (correct answer)
  • Human urine.
  • Madhi.
  • Menstrual blood.

Why

Impurity is divided into lesser, intermediate, and greater categories. The saliva of a dog is listed as greater impurity and has a special purification method.

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8. What is the safer approach when a person is able to remove impurity before prayer?

  • Purify oneself from all impurity, whether small or large. (correct answer)
  • Ignore every small impurity in all cases.
  • Remove only visible blood and nothing else.
  • Assume impurity never affects prayer.

Why

There is scholarly disagreement about whether small amounts of impurity are overlooked. The safer approach, especially for prayer, is to remove impurity when one is able.

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9. What is the ruling on slight traces of impurity caused by sweating when they are very difficult to avoid?

  • They are overlooked. (correct answer)
  • They always require changing clothes immediately.
  • They break wudu by themselves.
  • They invalidate every past prayer.

Why

Very slight traces caused by sweating are overlooked when they are difficult to avoid. The person should clean themselves properly after relieving themselves, then avoid falling into excessive worry and waswas.

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A note on these answers

These questions are for learning and self-testing. Explanations are drawn from the sources linked on each question and are not a fatwa. For a ruling on your own circumstances, please consult a qualified scholar.

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