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प्रश्न
State any two uses of diamond.
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उत्तर
Uses of diamonds:
(1) As diamonds have an extraordinary shine, they are used in making jewellery.
(2) Diamonds, due to their hardness, are used in instruments like glass cutters, grinders. They are also used as abrasives for polishing.
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संबंधित प्रश्न
What type of bond exist in CCl4?
What is buckminsterfullerene?
The atomic numbers of four elements P, Q, R and S are 6, 10, 12 and 17 respectively. Which two elements can combine to form a covalent compound?
(a) P and R
(b) Q and S
(c) P and S
(d) R and S
Out of KCl, HCl, CCl4 and NaCl, the compounds which are not ionic are:
(a) KCl and HCl
(b) HCl and CCl4
(c) CCl4 and NaCl
(d) KCl and CCl4
What happens when methane (natural gas) burns in air? Write the chemical equation of the reaction involved.
State the type of bonding in the following molecule.
Methane
Draw an electron dot diagram for the formation of the following. State the type of bonding present in them.
Hydroxyl ion
Explain the following briefly:
Sodium chloride dissolves in water but carbon tetra chloride is insoluble in water.
Give examples for the following:
Two gaseous polar compounds.
An element L consists of molecules.
What type of bonding is present in the particles that make up L?
Fill in the blank from the choice given in bracket.
The compound that does not have a lone pair of electrons is ___________. (Water, Ammonia, carbon tetrachloride)
Draw an electron dot diagram to show the formation of the following compound.
Magnesium chloride [ H=1, C=6, Mg=12, Cl=17].
Fill in the blank and rewrite the completed statement:
Covalent compounds are generally soluble in _________ solvents.
Answer the following question.
What is methane? Draw its electron dot structure. Name the type of bonds formed in this compound. Why are such compounds:
(i) poor conductors of electricity? and
(ii) have low melting and boiling points? What happens when this compound burns in oxygen?
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
| \[\begin{array}{cc} \phantom{.........}\ce{H}\\ \phantom{.........}|\\ \ce{H - C ≡ C - C - H}\\ \phantom{.........}|\\ \phantom{.........}\ce{H} \end{array}\] |
Cation is formed when ______.
Which of the following compound(s) possesses a high melting point?
In covalent bond formation, the sharing of ______ electrons takes place in their outermost shell.
Name the following:
\[\ce{CH3 - CH2CH = CH2}\]
In covalent compounds, the bond is formed due to ______ of electrons.
