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1
JEE Main 2023 (Online) 8th April Morning Shift
MCQ (Single Correct Answer)
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-1
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What is the purpose of adding gypsum to cement?

A
To facilitate the hydration of cement
B
To speed up the process of setting
C
To give a hard mass
D
To slow down the process of setting
2
JEE Main 2023 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
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-1
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The product, which is not obtained during the electrolysis of brine solution is :

A
NaOH
B
Cl$$_2$$
C
H$$_2$$
D
HCl
3
JEE Main 2023 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
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Ion having highest hydration enthalpy among the given alkaline earth metal ions is :

A
$$\mathrm{Sr}^{2+}$$
B
$$\mathrm{Ca}^{2+}$$
C
$$\mathrm{Be}^{2+}$$
D
$$\mathrm{Ba}^{2+}$$
4
JEE Main 2023 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Structures of $$\mathrm{BeCl}_{2}$$ in solid state, vapour phase and at very high temperature respectively are :

A
Polymeric, Dimeric, Monomeric
B
Dimeric, Polymeric, Monomeric
C
Polymeric, Monomeric, Dimeric
D
Monomeric, Dimeric, Polymeric
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