In an experiment, 30 mL of water is to be transferred into a conical flask - HSC - SSCE Chemistry - Question 1 - 2017 - Paper 1

To determine which equipment delivers the greatest accuracy for transferring 30 mL of water, we need to consider the precision of each option provided:

1. Burette: This is designed for delivering specific volumes of liquids with high precision. It has fine graduations allowing for measurable increments, making it the best choice for accuracy in transferring liquid.

2. Beaker: Beakers are generally used for mixing and holding liquids, but they do not have precise markings. Therefore, they are not suitable for accurate volume measurements.

3. Test tube: Test tubes are not typically used for measuring volumes accurately; they lack graduated markings, limiting their usefulness in this context.

4. Measuring cylinder: Measuring cylinders are more accurate than beakers but still not as precise as a burette.

Given these considerations, the equipment that delivers the volume with the greatest accuracy is the Burette (A).