Which ion forms a hydroxide highly soluble in water?

(1) Ni2+

(2) K+

(3) Zn2+

(4) Al3+

Concept Questions :-

Physical Properties
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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?

(1) A permanent white precipitate is formed immediately

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

(3) A white precipitate is formed which later dissolves

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

Concept Questions :-

Preparation of Na and Ca grp element
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A colourless salt gives violet colour to Bunsen flame and also turns moistured litmus paper blue. It Is:

(1) Na2CO3

(2) KNO3

(3) K2CO3

(4) Cu(OH)2

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Physical Properties
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Strongest reducing agent among the following is:

(1) K

(2) Na

(3) Al

(4) Mg

Concept Questions :-

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

(1) crystal melts

(2) crystal loses water

(3) crystal absorbs moisture and CO2

(4) crystal sublimes

Concept Questions :-

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

(a) KIO4

(b) KIO

(c) KI3

(d) KIO3

Concept Questions :-

Physical Properties
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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

(c) It contains Cs+, Br- and Br2 lattice molecules

(d) It contains Cs+ and Br3- ions

Concept Questions :-

Chemical Properties
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Hypo is chemically:

(a) Na2S2O3.2H2O

(b) Na2S2O3.3H2O

(c) Na2S2O3.4H2O

(d) Na2S2O3.5H2O

Concept Questions :-

Preparation of Na and Ca grp element
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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

(c) both in cationic and anionic parts

(d) there is no zinc left in the solution

Concept Questions :-

Preparation of Na and Ca grp element
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Brine is chemically:

(a) conc. solution of Na2CO3

(b) conc. solution of Na2SO4

(c) conc. solution of NaCl

(d) conc. solution of alum

Concept Questions :-

Physical Properties
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NEET 2021 - Achiever Batch - Aryan Raj Singh

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