1
JEE Main 2023 (Online) 25th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the following represents the correct order of metallic character of the given elements?

A
K < Mg < Be < Si
B
Si < Be < Mg < K
C
Be < Si < Mg < K
D
Be < Si < K < Mg
2
JEE Main 2023 (Online) 25th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion A : The alkali metals and their salts impart characteristic colour to reducing flame.

Reason R : Alkali metals can be detected using flame tests.

In the light of the above statements, choose the most appropriate answer from the options given below :

A
A is not correct but R is correct
B
A is correct but R is not correct
C
Both A and R are correct and R is the correct explanation of A
D
Both A and R are correct but R is NOT the correct explanation of A
3
JEE Main 2023 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion A : Beryllium has less negative value of reduction potential compared to the other alkaline earth metals.

Reason R : Beryllium has large hydration energy due to small size of Be$$^{2+}$$ but relatively large value of atomization enthalpy

In the light of the above statements, choose the most appropriate answer from the options given below :

A
Both A and R are correct but R is NOT the correct explanation of A
B
Both A and R are correct and R is the correct explanation of A
C
A is correct but R is not correct
D
A is not correct but R is correct
4
JEE Main 2023 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Identify the correct statements about alkali metals.

A. The order of standard reduction potential (M$$^+$$ | M) for alkali metal ions is Na > Rb > Li.

B. CsI is highly soluble in water.

C. Lithium carbonate is highly stable to heat.

D. Potassium dissolved in concentrated liquid ammonia is blue in colour and paramagnetic.

E. All the alkali metal hydrides are ionic solids.

Choose the correct answer from the options given below :

A
C and E only
B
A and E only
C
A, B, D only
D
A, B and E only
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