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Write scientific reason.
The coin disappears in a vessel as it is seen from a specific location. But as soon as the water is poured into the vessel to a certain level, the coin appears.
Concept: undefined >> undefined
Write scientific reason.
A pencil appears to be broken near the surface of water.
Concept: undefined >> undefined
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Write scientific reason.
Adding zinc particles to a solution of copper sulphate makes the blue solution colorless.
Concept: undefined >> undefined
What are reactants? Explain with the help of example.
Concept: undefined >> undefined
What are products? Explain with the help of example.
Concept: undefined >> undefined
Observe the given figure and name the following.
| Ray AB | |
| Ray NM | |
| Ray MD | |
| ∠ r |
Concept: undefined >> undefined
Match the columns.
| Reactants | Products | Types of chemical reaction | ||
| 1. | MgH2 | → | Mg + H2 | Endothermic |
| 2. | 2H2S + SO2 | → | 3S + 2H2O | Oxidation |
| 3. | CaO + H2O | → | Ca(OH)2 + heat | Exothermic |
| Redox | ||||
Concept: undefined >> undefined
Write three steps of writing chemical equations with example?
Concept: undefined >> undefined
Observe the given figure and write appropriate phenomenon of light in the box.
Concept: undefined >> undefined
Balance the given chemical reaction as per the instructions below.
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Write names of reactants and products of chemical reaction.
Concept: undefined >> undefined
Balance the given chemical reaction as per the instructions below.
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Make a list of the elements in the chemical equation.
Concept: undefined >> undefined
Balance the given chemical reaction as per the instructions below.
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Write the number of atoms of various elements in the reactants and products.
Concept: undefined >> undefined
Balance the given chemical reaction as per the instructions below.
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Balance the equation with proper coefficient and rewrite the equation.
Concept: undefined >> undefined
In refraction of light through a glass slab, the directions of the incident ray and the refracted ray are ______.
Concept: undefined >> undefined
Tungsten wire is used in electric bulbs.
Concept: undefined >> undefined
What are artificial satellites?
Concept: undefined >> undefined
Name the first artificial satellite sent to space.
Concept: undefined >> undefined
Fill in the blank:
The modern periodic table consists of ……………. periods.
Concept: undefined >> undefined
When a ray of light travels from air to glass slab and strikes the surface of separation at 90°, then it …………….
(a) bends towards normal
(b) bends away from normal
(c) passes unbent
(d) passes in zigzag way
Concept: undefined >> undefined
