Clorox bleach can be safely used to purify water in the event of an emergency. Clorox recommends adding 2 drops of bleach to 1 quart of water or 8 drops of bleach to 1 gallon of water. Clorox warns that only regular bleach is suitable for purifying water; scented bleaches are not safe for water purification.
The pass mark for the Theory Test is 86%, so you'll need to answer 43/50 multiple choice questions correctly to pass. And for the hazard perception section of the test, you need to score 44/75. You must score a pass in both sections of the theory test to pass the overall test. What is the current pass rate for the theory test? The 2015/16 pass rate for the theory test is 49.3%*, which means just over half of all people who sit their Theory Test fail it.
They may choose to test in only one area, or they may choose to test in more than one area, or they may choose to take the universal test which consists of 100 questions: 25 general and 75 sector-specific (25 from each sector of Type I, Type II and Type III). The minimum passing score is 70%.