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Write scientific reason.
Elements belonging to the same group have the same valency.
Concept: Periodic Trends in the Modern Periodic Table
An element has its electron configuration as 2, 8, 2. Now answer the following question.
What is the group of this element?
Concept: The Modern Periodic Table >> Modern Periodic Table and Electronic Configuration of Elements
State the modern periodic law.
Concept: The Modern Periodic Table
Define ‘redox reaction’. Give one example.
Concept: Chemical Properties of Carbon Compounds > Oxidation
- Complete the given chemical reaction:
\[\ce{CuSO4_{(aq)} + Fe_{(s)} ->}\] _______ + _______ - Name the type of the reaction.
Concept: Types of Chemical Reactions > Single Displacement Reaction
The chemical reaction in which two or more products are formed from a single reactant is called ______ reaction.
Concept: Types of Chemical Reactions > Decomposition Reaction
Observe the following figure and write the answer of the question.
- Which process is shown in the figure?
- Explain the chemical reaction shown in the figure.
- Write the reactions on anode and cathode.
Concept: Corrosion of Metals
The device used for producing electric current is called _________.
Concept: Electromagnetic Induction
Give a scientific reason:
For electric power transmission, copper or aluminium wire is used.
Concept: Heating Effect of Electric Current
Identify the figure and give its use.
Concept: Heating Effect of Electric Current
Identify the figure and give its use.
Concept: Heating Effect of Electric Current
Name the following diagram and explain the concept behind it.
Concept: Electromagnetic Induction
Identify the figure and give its use.
Concept: Galvanometer
Read the following paragraph and answer the questions based on it.
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If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy. The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box, then no energy can flow from inside the box or come into the box. |
- Heat is transferred from where to where?
- Which principle do we learn about from this process?
- How will you state the principle briefly?
Concept: Heat Exchange
What is refraction of light?
Concept: Refraction of Light
We can see the sun even when it is little below the horizon because of ______.
Concept: Refraction of Light
Explain how the formation of a rainbow occurs.
Concept: Refraction of Light
Given below is a diagram showing a defect of human eye. Study it and answer the following questions.
(i) Name the defect shown in the figure.
(ii) Give reason for this defect of eye in human being.
(iii) Name the type of lens used to correct the eye defect.
Concept: Defects of Vision and Their Corrections > Myopia
Observe the given figure of reactivity series of metals and answer the following questions:
Reactivity series of metals
- Name two metals which react with water.
- Name two moderately reactive metals.
- Name the most highly reactive metal and the most less reactive metal.
Concept: Basic Principles of Metallurgy > Extraction of Metals
Observe the following figure and write the answer of the question.
- Which process is shown in the figure?
- Explain the chemical reaction shown in the figure.
- Write the reactions on anode and cathode.
Concept: Corrosion of Metals
