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प्रश्न
Explain the following reaction with balanced chemical equation:
Calcium reacts with water.
उत्तर
Calcium reacts with water with some vigor to produce calcium hydroxide solution and sets free hydrogen gas. Resulting solution is warm.
\[\ce{Ca + 2H2O -> Ca(OH)2 + H2_{(g)}}\]
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संबंधित प्रश्न
‘A’ is an element having four electrons in its outermost orbit. An allotropes ‘B’ of this element is used as a dry lubricant in machinery and in pencil leads. So:
i. Write the name of element ‘A’ and its allotropes.
ii. State whether ‘B’ is a good conductor or non-conductor of electricity?
Define Saturated hydrocarbon.
Define Catenation.
Give a chemical test to distinguish between saturated and unsaturated hydrocarbons.
Explain in brief two main reasons for carbon forming a large number of compounds.
Why does carbon form strong bonds with most other elements ?
How many structural isomers can you draw for pentane?
What are the two properties of carbon which lead to the huge number of carbon compounds we see around us?
Draw the electron dot structures for F2.
A compound 'X' on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound 'Y'. 'X' also reacts with sodium metal to evolve a colourless gas 'Z'. Identify 'X', 'Y' and 'Z'. Write the equation of the chemical reaction of formation of 'Y' and also write the role of sulphuric acid in the reaction.
Fill in the following blank with suitable word:
Ethyne has ......... carbon-hydrogen single bonds.
An unsaturated hydrocarbon having a triple covalent bond has 50 hydrogen atoms in its molecule. The number of carbon atoms in its molecule will be:
(a) 24
(b) 25
(c) 26
(d) 28
Which of the two is better for our health : butter or vegetable oil? Why?
Which of the following hydrocarbons can decolourise bromine water and which cannot? Why?
C6H12, C6H14, C6H10
Which of the following statements are usually correct for carbon compounds? These
- are good conductors of electricity
- are poor conductors of electricity
- have strong forces of attraction between their molecules
- do not have strong forces of attraction between their molecules
In which of the following compounds, — OH is the functional group?
Write the name of the following compound
\[\begin{array}{cc}
\phantom{....}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{O}\phantom{......}\\
\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{....}||\phantom{......}\\
\ce{H} - \ce{C} - \ce{C} - \ce{C} - \ce{C} - \ce{C} - \ce{OH}\\
\phantom{}|\phantom{....}|\phantom{....}|\phantom{....}|\phantom{.......}\\
\phantom{}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\phantom{.......}\\
\end{array}\]
Carbon, Group (14) element in the Periodic Table, is known to form compounds with many elements. Write an example of a compound formed with
- chlorine (Group 17 of Periodic Table)
- oxygen (Group 16 of Periodic Table)
- What are hydrocarbons? Give examples.
- Give the structural differences between saturated and unsaturated hydrocarbons with two examples each.
- What is a functional group? Give examples of four different functional groups.
