Identification of Ions & Gases
1. This question has 3 part(s).
1.1. Two liquids, L and M, were analysed. L was aqueous potassium iodide. M was a colourless liquid. The tests on the liquids and some of the observations are in the following table.
Complete the observations in the table.
Tests | Observations |
Test 1 on liquid L Appearance of liquid L | |
Test 2 Liquid L was divided into three equal portions in separate test-tubes. (i) An iodine crystal was added to the first portion of liquid L. The test-tube was stoppered and the contents shaken. (ii) An equal volume of liquid M was added to the test-tube, the contents shaken and left to stand for five minutes. | (i) liquid turned orange (ii) two layers were formed, pink top layer and orange lower layer |
Test 3 To the second portion of liquid L, dilute nitric acid and barium nitrate solution were added. | |
Test 4 To the third portion of liquid L, dilute nitric acid and silver nitrate solution were added. |
i) Describe the appearance of liquid L in Test 1.
[1]
ii) Describe the observation made as a result of Test 3.
[1]
iii) Describe the observation made as a result of Test 4.
[2]
1.2. Why does the colour of liquid L change in Test 2 part (i)?
1.3. What conclusions can you draw about liquid M from Test 2 part (ii)?
Ai এর মাধ্যমে
১০ লক্ষ+ প্রশ্ন ডাটাবেজ
প্র্যাকটিস এর মাধ্যমে নিজেকে তৈরি করে ফেলো
উত্তর দিবে তোমার বই থেকে ও তোমার মত করে।
সারা দেশের শিক্ষার্থীদের মধ্যে নিজের অবস্থান যাচাই
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