EASY
JEE Main
IMPORTANT
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In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present?

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Important Questions on The s-Block Elements

EASY
JEE Main
IMPORTANT
Which one of the following alkaline earth metal ions has the highest ionic mobility in its aqueous solution?
MEDIUM
JEE Main
IMPORTANT
BeO reacts with HF in presence of ammonia to give A which on thermal decomposition produces B and ammonium fluoride. Oxidation state of Be in A is
MEDIUM
JEE Main
IMPORTANT
Nitrogen gas is obtained by thermal decomposition of:
HARD
JEE Main
IMPORTANT

Match List-I with Match List-II

  List-I
(Metal)
  List-II
(Emitted light wavelength nm)
(A) Li (I) 670.8
(B) Na (II) 589.2
(C) Rb (III) 780.0
(D) Cs (V) 455.5

Choose the most appropriate answer from the options given below

EASY
JEE Main
IMPORTANT
Amongst baking soda, caustic soda and washing soda carbonate anion is present in :
 
HARD
JEE Main
IMPORTANT
Choose the correct order of density of the alkali metals