The reaction between barium hydroxide and ammonium chloride is:

Subject: General Science

Topic: Chemical Reactions and Equations

Options:

1. Option A: Exothermic
2. Option B: Endothermic
3. Option C: Combination
4. Option D: Redox

Correct Answer:

Option B: Endothermic

Explanation:

The text describes the activity: 'Take about 2 g barium hydroxide in a test tube. Add 1 g of ammonium chloride and mix ... Touch the bottom of the test tube with your palm. What do you feel? Is this an exothermic or endothermic reaction?' This reaction absorbs heat from the surroundings, making the test tube feel cold, hence it is endothermic.