NEET Questions Solved


Which ion forms a hydroxide highly soluble in water?

(a) Ni2+

(b) K+

(c) Zn2+

(d) Al3+

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

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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

(c) K2CO3

(d) Cu(OH)2

(c) Violet colour to flame is characteristic of potassium. Also aqueous solution of K2CO3 is alkaline.

Difficulty Level:

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Strongest reducing agent among the following is:

(a) K

(b) Na

(c) Al

(d) Mg

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

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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

(c) crystal absorbs moisture and CO2

(d) crystal sublimes

(c) NaOH absorbs moisture and CO2 from air to form Na2CO3

2NaOH + CO2          Na2CO3 + H2O2

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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

(C) KI + I2           KI3

Difficulty Level:

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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

(c) It is a fact.

Difficulty Level:

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Sodium reacts with water less vigorously than potassium because:

(a) it has higher atomic weight

(b) it is less electropositive

(c) it is more electronegative

(d) it is metal

(b) The reactivity of alkali metals increases down the group.

Difficulty Level:

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Which property increases in magnitude as the atomic number of alkali metals increases ?

(a) Electronegativity

(b) First ionisation energy

(c) Ionic radius

(d) Melting point

(c) Ionic radius increases down the group.

Difficulty Level:

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Common table salt becomes moist and does not pour easily in rainy season because:

(a) it contains magnesium chloride

(b) it contains magnesium carbonate

(c) it melts slightly in rainy season

(d) sodium chloride is hygroscopic

(a) MgCl2 is hygroscopic

Difficulty Level:

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a  mixture of Al(OH)3 and Fe(OH)3 can be seperated easily by treating it with:

(a) HCl

(b) NH4OH

(c) HNO3

(d) NaOH

(d) Al(OH)3 is soluble in NaOH(aq) whereas Fe(OH)3 is insoluble.

Difficulty Level:

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