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Name the Black Substance of Pencil. Will the Current Flow Through the Electrical Circuit When We Use the Sharpened Ends of the Pencil to Complete the Circuit? - Science

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प्रश्न

Name the black substance of pencil. Will the current flow through the electrical circuit when we use the sharpened ends of the pencil to complete the circuit?

उत्तर

The black substance inside a pencil is graphite.
Yes, current will flow through the electrical circuit if we use the sharpened ends of the pencil to complete the circuit, as graphite is a good conductor of electricity.

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अध्याय 4: Carbon And Its Compounds - Exercise 1 [पृष्ठ २२१]

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लखमीर सिंग Chemistry (Science) [English] Class 10
अध्याय 4 Carbon And Its Compounds
Exercise 1 | Q 8 | पृष्ठ २२१

वीडियो ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्न

What type of bond is present in oxygen molecule?


Why does carbon form compounds mainly by covalent bonding?

 

 Why is diamond used for making cutting tools (like glass cutters) but graphite is not?


What type of bonding would you expect between Carbon and Chlorine? 


The electronic configurations of three elements X, Y and Z are as follows:

X 2, 4
Y 2, 7
Z 2, 1

(a) Which two elements will combine to form an ionic compound?
(b) Which two elements will react to form a covalent compound?
Give reasons for your choice.


What do you understand by polar covalent compounds?


Complete the following:

When the nuclei of two different reacting atoms are of ______ mass, then a bond so formed is called ______ covalent bond. (equal, unequal, polar, non-polar)


Which element exhibits the property of catenation to maximum extent and why?


Explain the following term with example.

Homopolymer


Write answer as directed.
Saturated hydrocarbons are classified into three types. Write these names giving one example each.


Molecular formula of Propane is C3H8 , write the structural formula of propane.


Explain the bonding in methane molecule using electron dot structure.


State the type of bonding in the following molecule.
Water


Electrons are getting added to an element Y: 

which electrode will Y migrate to during the process of electrolysis?


The number of electrons in the valence shell of a carbon atom is 4.


Complete the following activity.

Write the names of the hydrocarbons for the following structural formula.

(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)

 

The correct structural formula of butanoic acid is -


Acetic acid was added to a solid X kept in a test tube. A colourless, odourless gas Y was evolved. The gas was passed through lime water, which turned milky. It was concluded that ______.


Which of the following statements are correct for carbon compounds?

  1. Most carbon compounds are good conductors of electricity.
  2. Most carbon compounds are poor conductors of electricity.
  3. Force of attraction between molecules of carbon compounds is not very strong.
  4. Force of attraction between molecules of carbon compounds is very strong.

Assertion (A): Melting point and boiling point of ethanol are lower than that of sodium chloride.

Reason (R): The forces of attraction between the molecules of ionic compounds are very strong. 


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