2. TBQ - Lime water experiment

Question:

4 m.

Read the experiment given below and answer the questions that follow.

Two test tubes connected with a delivery tube were used for four experiments. In every experiment, the gas formed in the first test tube was bubbled through lime water in the second test tube.

Experiment (a): Vinegar + baking soda
Experiment (b): Lemon juice + vinegar
Experiment (c): Vinegar + common salt
Experiment (d): Lemon juice + baking soda

1. Which experiment(s) will turn the lime water milky?

Only (a)
(a) and (d)
(b) and (c)
Only (b)

2. Suppose baking soda in Experiment (a) is replaced with washing soda. Which conclusion is most appropriate?

Carbon dioxide will definitely be produced in the same way.
The reaction may not produce carbon dioxide in the same manner because washing soda is a different compound.
Lime water will always turn blue.
No chemical reaction can occur.

3. A student forgot to add lime water into the second test tube. Instead, plain water was used.
What is the most likely observation?

The water becomes blue.
White crystals appear instantly.
No visible change is observed even if carbon dioxide is produced.
The water turns milky immediately.

4. Which property of carbon dioxide is being tested in this investigation?

It burns with a blue flame.
It reacts with lime water to produce a white precipitate.
It changes blue litmus red.
It supports combustion.

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