WB TET · Mathematics and Science (Paper II)
Properties, indicators and uses of acids, bases and salts.
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Q1 · Acids, Bases and Salts · EASY
A student tests a household substance with red litmus paper and observes that it turns blue. Which of the following is most likely the substance being tested?
Q2 · Acids, Bases and Salts · MEDIUM
During a science experiment, a teacher demonstrates the reaction between dilute hydrochloric acid and sodium hydroxide solution. At the end of the reaction, the solution becomes neutral. Which of the following statements correctly describes this process?
Q3 · Acids, Bases and Salts · MEDIUM
A farmer finds that his soil has become too acidic for proper crop growth. He adds a white powder to the soil to neutralise the excess acidity. The powder he most likely used is:
Q4 · Acids, Bases and Salts · HARD
A student prepared a dilute solution of an acid and divided it into three test tubes. She then added: - Zinc metal to tube 1 - Magnesium ribbon to tube 2 - Copper turnings to tube 3 She observed that gas bubbles were evolved in tubes 1 and 2, but not in tube 3. Which of the following explains this observation correctly?
Q5 · Acids, Bases and Salts · MEDIUM
What is the pH value of a neutral solution at 25°C?