Calculate the number of moles of magnesium present in a magnesium ribbon weighing $12 \, g$. The molar atomic mass of magnesium is $24 \, g \, mol^{-1}$. (in $, mol$)
- A$6.5$
- B$2.5$
- C$0.5$
- D$1.5$
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Complete the following crossword puzzle by using the names of the chemical elements based on the data provided in the table.
Across Down $2$. The element used by Rutherford during his $\alpha$-scattering experiment. $1$. $A$ white lustrous metal used for making ornaments and which tends to get tarnished black in the presence of moist air. $3$. An element which forms rust on exposure to moist air. $4$. Both brass and bronze are alloys of this element. $5$. $A$ very reactive non-metal stored under water. $6$. The metal which exists in the liquid state at room temperature. $7$. Zinc metal when treated with dilute hydrochloric acid produces a gas of this element which when tested with a burning splinter produces a pop sound. $8$. An element with the symbol $Pb$.
| Across | Down |
|---|---|
| $2$. The element used by Rutherford during his $\alpha$-scattering experiment. | $1$. $A$ white lustrous metal used for making ornaments and which tends to get tarnished black in the presence of moist air. |
| $3$. An element which forms rust on exposure to moist air. | $4$. Both brass and bronze are alloys of this element. |
| $5$. $A$ very reactive non-metal stored under water. | $6$. The metal which exists in the liquid state at room temperature. |
| $7$. Zinc metal when treated with dilute hydrochloric acid produces a gas of this element which when tested with a burning splinter produces a pop sound. | $8$. An element with the symbol $Pb$. |
Difficult
View SolutionWhat is a molecular formula? State with an example what information can be derived from a molecular formula.
Medium
View SolutionDoes the solubility of a substance change with temperature? Explain with the help of an example.
Easy
View SolutionMention the name given to the number of $6.022 \times 10^{23}$ particles.
Easy
View SolutionWhich of the following species is electrically neutral and why?
$K^{+}, Cl^{-}, S^{2-}, P^{3-}, K$
$K^{+}, Cl^{-}, S^{2-}, P^{3-}, K$
Easy
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