Portland cement contains '$X$' to enhance the setting time. What is '$X$'?
- A$CaSO_{4} \cdot \frac{1}{2} H_{2}O$
- B$CaSO_{4} \cdot 2 H_{2}O$
- C$CaSO_{4}$
- D$CaCO_{3}$
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Similar Questions
Given below are two statements,one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A:$ Beryllium has a less negative value of reduction potential compared to the other alkaline earth metals.
Reason $R:$ Beryllium has large hydration energy due to the small size of $Be^{2+}$ but a relatively large value of atomization enthalpy.
In the light of the above statements,choose the most appropriate answer from the options given below.
Assertion $A:$ Beryllium has a less negative value of reduction potential compared to the other alkaline earth metals.
Reason $R:$ Beryllium has large hydration energy due to the small size of $Be^{2+}$ but a relatively large value of atomization enthalpy.
In the light of the above statements,choose the most appropriate answer from the options given below.
Which of the following reactions does not take place?
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View SolutionThe pair of elements that form both oxides and nitrides when burnt in air are
Powdered Beryllium burns in air to give
Give two uses of Plaster of Paris.
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