MEDIUM
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IMPORTANT
Earn 100

Match List - I with List - II.
List-I (Salt) List-II (Flame colour wavelength)
(a) LiCl (i) 455.5 nm
(b) NaCl (ii) 670.8 nm
(c) RbCl (iii) 780.0 nm
(d) CsCl (iv) 589.2 nm

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Important Questions on The s-Block Elements

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JEE Main
IMPORTANT

Number of amphoteric compounds among the following is

(A) BeO

(B) BaO

(C) BeOH2

(D) SrOH2

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IMPORTANT

Match List-I with List-II

 

List - I

(Elements)

 

List - II

(Properties)

(a) Ba (i) Organic solvent soluble compounds
(b) Ca (ii) Outer electronic configuration 6 s2
(c) Li (iii) Oxalate insoluble in water
(d) Na (iv) Formation of very strong monoacidic base

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IMPORTANT
A s-block element (M) reacts with oxygen to form an oxide of the formula MO2. The oxide is pale yellow in colour and paramagnetic. The element (M) is:
EASY
JEE Main
IMPORTANT
Two elements A and B have similar chemical properties. They don't form solid hydrogencarbonates, but react with nitrogen to form nitrides. A and B, respectively, are :
EASY
JEE Main
IMPORTANT
The metal mainly used in devising photoelectric cells is :
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IMPORTANT
The correct statement(s) among I to III with respect to potassium ions that are abundant within the cell fluids, is/are
I. They activate many enzymes.
II. They participate in the oxidation of glucose to produce ATP.
III. Along with sodium ions, they are responsible for the transmission of nerve signals.
MEDIUM
JEE Main
IMPORTANT
A metal on combustion in excess air forms X . X upon hydrolysis with water yields H2O2 and O2 along with another product. The metal is: