Advertisements
Advertisements
In ______ process a layer of molten tin is deposited on metals.
Concept: undefined >> undefined
Corrosion can be prevented by using ……………. solution.
Concept: undefined >> undefined
Advertisements
Define ‘redox reaction’. Give one example.
Concept: undefined >> undefined
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: undefined >> undefined
Suggest measures to minimize electricity consumption at home.
Concept: undefined >> undefined
In a Std. X class out of 40 students 10 students use spectacles, 2 students have positive power and 8 students have negative power of lenses in their spectacles.
Answer the following questions:
(1) What does the negative power indicate?
(2) What does the positive power indicate?
(3) Generally which type of spectacles do most of the students use?
(4) What defect of eyesight do most of the students suffer from?
(5) Give two possible reasons for the above defect.
Concept: undefined >> undefined
The chemical formula for rust is.............. .
Concept: undefined >> undefined
Explain two possible reasons of myopia. How can it be corrected? Explain with a suitable diagram.
Concept: undefined >> undefined
Define corrosion.
Concept: undefined >> undefined
What is meant by rust?
Concept: undefined >> undefined
Write the chemical formula of rust.
Concept: undefined >> undefined
Give scientific reason.
It is reccommended to use air tight container for storing oil for long time.
Concept: undefined >> undefined
Identify from the reaction the reactants that undergo oxidation and reduction.
Fe + S → FeS
Concept: undefined >> undefined
Identify from the following reaction the reactants that undergo oxidation and reduction.
\[\ce{2Ag2O → 4 Ag + O2 \uparrow}\]
Concept: undefined >> undefined
Identify from the reaction the reactants that undergo oxidation and reduction.
2Mg + O2 → 2MgO
Concept: undefined >> undefined
Identify from the reaction the reactants that undergo oxidation and reduction.
\[\ce{NiO + H2 -> Ni + H2O}\]
Concept: undefined >> undefined
Write the name and symbol of the element from the description.
The atom having the smallest size.
Concept: undefined >> undefined
Write the name and symbol of the element from the description.
The atom having the smallest atomic mass.
Concept: undefined >> undefined
Write the name and symbol of the element from the description.
The noble gas with the smallest atomic radius.
Concept: undefined >> undefined
