Which ion forms a hydroxide highly soluble in water?
(1) Ni2+
(2) K+
(3) Zn2+
(4) Al3+
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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
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Difficulty Level:
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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Difficulty Level:
Strongest reducing agent among the following is:
(1) K
(2) Na
(3) Al
(4) Mg
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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
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Difficulty Level:
Which one of the following is formed on dissolving I2 in aqueous solution of KI ?
(a) KIO4
(b) KIO
(c) KI3
(d) KIO3
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Difficulty Level:
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 ions
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Difficulty Level:
Hypo is chemically:
(a) Na2S2O3.2H2O
(b) Na2S2O3.3H2O
(c) Na2S2O3.4H2O
(d) Na2S2O3.5H2O
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Difficulty Level:
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
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Difficulty Level:
Brine is chemically:
(a) conc. solution of Na2CO3
(b) conc. solution of Na2SO4
(c) conc. solution of NaCl
(d) conc. solution of alum
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