1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Morning Slot

The alkaline earth metal nitrate that does not crystallise with water molecules, is :
A
Mg(NO3)2
B
Sr(NO3)2
C
Ca(NO3)2
D
Ba(NO3)2

Explanation

When central atom size is smaller then more water molecule will crystallize. Ba(NO3)2 does not ctystallize with water as size of Ba+2 ion is very large.
2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Evening Slot

The metal that forms nitride by reacting directly with N2 of air, is :
A
K
B
Li
C
Rb
D
Cs

Explanation

Only Li react directly with N2 out of alkali metals

6 Li + N2 $$ \to $$ 2Li3N
3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Morning Slot

The metal used for marking X–ray tube window is :
A
Ca
B
Na
C
Mg
D
Be

Explanation

''Be'' Metal is used in x-ray window is due to transparent to x-rays.
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Evening Slot

Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of :
A
ammoniated electrons
B
sodamide
C
sodium-ammonia complex
D
sodium ion-ammonia complex

Explanation

Na + (x + y)NH3($$l$$) $$ \to $$ [Na(NH3)x]+ + [e(NH3)y]-

[e(NH3)y]- is called solvated or ammoniated electron.

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