Ammonia gas is passed through quicklime and then collected in a jar. Red and blue litmus papers are placed in the jar. W, X, Y and Z are the four observations. Which of the above observations correctly shows the reaction of the litmus papers to ammonia?

1. W
2. X
3. Y
4. Z

Glucose reacts with concentrated sulphuric acid to give a very pure form of carbon called sugar charcoal.

The reaction taking place is:

1. oxidation
2. combustion
3. dehydration
4. combination

The basicity of acetic acid is:

1. 1
2. 2
3. 3
4. 4

A ⟶ A⁺³; B ⟶ B^-1
Number of electrons present in the outermost shell of atoms A and B respectively are:

1. 5, 1
2. 3, 1
3. 3, 7
4. 5, 7