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सङ्ख्यावाचकानि।
भोजने ______ (६) रसेषु मधुरः रसः मम प्रियः।
Concept: सङ्ख्यावाचकानि ।
सूचनानुसारं कृती: कुरुत।
मृगः प्रत्यहं तत्र गत्वा सस्यम् अखादत्। (त्वान्त-अव्ययं निष्कासयत।)
Concept: व्याकरणवीथि [दशमी कक्षा]
Solve the problem.
If the mass of a planet is eight times the mass of the Earth and its radius is twice the radius of the Earth, what will be the escape velocity for that planet?
Concept: Free Fall
Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in ______.
Concept: Classification of Elements
Give scientific reasons for the following:
Atomic radius goes on decreasing while going from left to right in a period.
Concept: Periodic Properties >> Atomic Size
Write a scientific reason.
Atomic radius goes on increasing down a group.
Concept: Periodic Properties >> Atomic Size
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 atomic number of this element?
Concept: The Modern Periodic Table >> Modern Periodic Table and Electronic Configuration of Elements
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
An element has its electron configuration as 2, 8, 2. Now answer the following question.
To which period does this element belong?
Concept: The Modern Periodic Table >> Modern Periodic Table and Electronic Configuration of Elements
Define ‘redox reaction’. Give one example.
Concept: Chemical Properties of Carbon Compounds > Oxidation
Define corrosion.
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
