Complete the following equation : CaCl 2 + Na 2 CO 3 → _____ + _____

When calcium chloride (a soluble ionic compound), reacts with sodium carbonate (also a soluble ionic compound) there is formation of calcium carbonate (it is an insoluble solid that precipitates out of solution) and sodium chloride (another soluble ionic compound). The reaction is as follows : CaCl 2 aq . + Na 2 CO 3 aq . → 2 NaCl aq . + CaCO 3 s

Complete the following equation : CuO + H 2 → _____ + _____

In redox reactions, the reactants undergo a change in their oxidation states. All the redox reactions involve two processes- a reduction process and an oxidation process. These two processes always occur simultaneously. Thus redox reactions are chemical reactions that involve the transfer of electrons between the reactants taking part in it. CuO + H 2 → Cu + H 2 O Now, in the given reaction, copper which is in + 2 oxidation state in cupric oxide gains 2 electrons and gets reduced to a 0 state in the copper atom. On the other hand, hydrogen in 0 state in a hydrogen atom loses 2 electrons and gets oxidized into + 1 the state in water. Thus, hydrogen is oxidized and copper is reduced.

E M B I B E

New Trends in Chemistry Class 8>Chapter 8 - Water>Objective Questions

Baljinder Kaur Solutions for Chapter: Water, Exercise 4: Objective Questions

Author:Baljinder Kaur

Baljinder Kaur Chemistry Solutions for Exercise - Baljinder Kaur Solutions for Chapter: Water, Exercise 4: Objective Questions

Attempt the practice questions on Chapter 8: Water, Exercise 4: Objective Questions with hints and solutions to strengthen your understanding. New Trends in Chemistry Class 8 solutions are prepared by Experienced Embibe Experts.