Highly soluble hydroxide in water is formed by -

1. Ni2+

2. K+

3. Zn2+

4. Al3+

Subtopic:  Physical Properties |
 74%
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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

Subtopic:  Physical Properties |
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Hypo is chemically:

1. Na2S2O3.2H2O

2. Na2S2O3.3H2O

3. Na2S2O3.4H2O

4. Na2S2O3.5H2O

Subtopic:  Preparations, Properties & Uses of S Block Elements |
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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:

1. cationic part

2. anionic part

3. both in cationic and anionic parts

4. there is no zinc left in the solution

Subtopic:  Preparations, Properties & Uses of S Block Elements |
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Brine is chemically:

1. conc. solution of Na2CO3

2. conc. solution of Na2SO4

3. conc. solution of NaCl

4. conc. solution of alum

Subtopic:  Physical Properties | Chemical Properties |
 84%
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Sodium reacts with water less vigorously than potassium because:

1. it has higher atomic weight

2. it is less electropositive

3. it is more electronegative

4. it is metal

Subtopic:  Physical Properties |
 69%
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NO2 is obtained by heating:

1. CsNO3

2. KNO3

3. LiNO3

4. NaNO3

Subtopic:  Chemical Properties |
 71%
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Common table salt becomes moist and does not pour easily in rainy season because:

1. It contains magnesium chloride.

2. It contains magnesium carbonate.

3. It melts slightly in rainy season.

4. Sodium chloride is hygroscopic.

Subtopic:  Physical Properties |
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Excess of dilute sodium hydroxide solution is gradually added with shaking to an aqueous solution of zinc sulphate. What would you observe?

1. A light blue precipitate is first formed which finally dissolves to give a deep blue solution

2. A white precipitate appears which dissolves to give a colourless solution.

3. A white precipitation is formed which does not dissolve 

4. No change takes place and the solution remains clear

Subtopic:  Chemical Properties |
 64%
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The products of the electrolysis of aqueous solution of common salt are:

1. Na + Cl2

2. H2 + O2

3. NaOH + H2 + Cl2

4. NaOH + Cl2 + O2

Subtopic:  Physical Properties | Preparations, Properties & Uses of S Block Elements |
 73%
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