NEET Chemistry The s-Block Elements Questions Solved

Concept Questions :-

Physical Properties & Characteristics

(b) Alkali metal hydroxides are highly soluble in water.

Difficulty Level:

(a)
8%
(b)
66%
(c)
8%
(d)
20%

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What would you observe if excess of dilute NaOH solution is added and shaken with an aqueous solution of aluminium chloride?

(a) A permanent white precipitate is formed immediately

(b) No change at first but a white precipitate is formed on standing

(d) A green precipitate which turns red on standing in air

Concept Videos :-

#3 | NaOH (Caustic Soda)

#4 | Na2CO3 (Sodium Carbonate), Gypsum & POP

Concept Questions :-

Some Important Compounds of Na

(c)

${AlCl}_{3} + 3 NaOH \overset{}{\to} Al (OH)_{3} + 3 NaCl Al (OH)_{3} + 3 NaOH \overset{}{\to} {Na}_{3} {AlO}_{3} + 3 H_{2} O soluble$

Difficulty Level:

(a)
25%
(b)
23%
(c)
47%
(d)
6%

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A colourless salt gives violet colour to Bunsen flame and also turns moistured litmus paper blue. It Is:

(a) Na₂CO₃

(b) KNO₃

(d) Cu(OH)₂

Concept Videos :-

#1 | Physical Properties

Concept Questions :-

Physical Properties & Characteristics

Difficulty Level:

(a)
18%
(b)
33%
(c)
38%
(d)
14%

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Strongest reducing agent among the following is:

(a) K

(b) Na

(d) Mg

Concept Videos :-

#1 | Physical Properties

Concept Questions :-

Physical Properties & Characteristics

(a) Alkali metals are strongest reducing agents. Also, their reducing power increases down the group.

Difficulty Level:

(a)
48%
(b)
33%
(c)
11%
(d)
10%

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When crystal of caustic soda is exposed to air, a liquid layer is deposited because:

(a) crystal melts

(b) crystal loses water

(d) crystal sublimes

Concept Videos :-

#1 | Physical Properties

Concept Questions :-

Physical Properties & Characteristics

$2 NaOH + {CO}_{2} \underset{}{\to} {Na}_{2} {CO}_{3} + H_{2} O$ 2

Difficulty Level:

(a)
4%
(b)
15%
(c)
76%
(d)
7%

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Which one of the following is formed on dissolving I₂ in aqueous solution of KI ?

(a) KIO₄

(b) KIO

(d) KIO₃

Concept Videos :-

#1 | Physical Properties

Concept Questions :-

Physical Properties & Characteristics

Difficulty Level:

(a)
15%
(b)
13%
(c)
36%
(d)
38%

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Which of the following statements is correct for CsBr₃?

(a) it is a covalent compound

(b) It contains Cs²⁺ and Br^- ions

(d) It contains Cs⁺ and ${Br}_{3}^{-}$ ions

Concept Videos :-

#2 | Chemical Properties

Concept Questions :-

Chemical Properties

(d) ${CsBr}_{3} \overset{}{\to} {Cs}^{+} + {Br}_{3}^{-}$

Difficulty Level:

(a)
15%
(b)
13%
(c)
36%
(d)
38%

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Hypo is chemically:

(a) Na₂S₂O₃.2H₂O

(b) Na₂S₂O₃.3H₂O

(d) Na₂S₂O₃.5H₂O

Concept Videos :-

#3 | NaOH (Caustic Soda)

#4 | Na2CO3 (Sodium Carbonate), Gypsum & POP

Concept Questions :-

Some Important Compounds of Na

(d) It is chemical formula of Hypo.

Difficulty Level:

(a)
36%
(b)
18%
(c)
17%
(d)
31%

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If NaOH is added to an aqueous solution of Zn²⁺ ions, a white precipitate appears and on adding axcess NaOH, the precepitate dissolves. In this solution zinc exists in the:

(a) cationic part

(b) anionic part

(d) there is no zinc left in the solution

Concept Videos :-

#3 | NaOH (Caustic Soda)

#4 | Na2CO3 (Sodium Carbonate), Gypsum & POP

Concept Questions :-

Some Important Compounds of Na