which of the following group of rocks
can be easily dissolved in water?
a,sandstone,granite and obsidian
b.limestone,granite and basalt
c.quartz,schitz and chalk
d.limestone,chalk and sandstone
To determine which group of rocks can be easily dissolved in water, we need to understand the properties of the rocks and how they react with water.
Firstly, water can dissolve certain types of rocks due to its solvent properties. Rocks that contain minerals that are soluble in water can undergo a chemical reaction when they come into contact with water, leading to dissolution.
Now let's evaluate each group of rocks provided:
a) Sandstone, granite, and obsidian: Sandstone is composed of compacted sand grains, granite is a coarse-grained igneous rock, and obsidian is a natural glass rock. These rocks do not contain minerals that are readily soluble in water. Therefore, this group is unlikely to easily dissolve in water.
b) Limestone, granite, and basalt: Limestone is a sedimentary rock primarily composed of calcium carbonate. It is known to be easily dissolved in water, especially if it contains impurities. Granite and basalt, on the other hand, do not have minerals that readily dissolve in water. Therefore, limestone in this group is the only rock that can be easily dissolved in water.
c) Quartz, schist, and chalk: Quartz is a hard mineral and is not soluble in water. Schist is a metamorphic rock formed from other rocks and typically does not contain minerals that dissolve in water. Chalk, however, is predominantly composed of calcium carbonate, the same mineral found in limestone. Chalk is known to readily dissolve in water. So, the chalk in this group is the only rock that can be easily dissolved in water.
d) Limestone, chalk, and sandstone: Limestone and chalk are both composed of calcium carbonate and are therefore easily dissolved in water. Sandstone, on the other hand, primarily consists of sand grains cemented together, and the minerals in sandstone are typically not soluble in water. Therefore, limestone and chalk in this group are the rocks that can be easily dissolved in water.
From the options provided, the correct answer would be option (d) - limestone, chalk, and sandstone.