The strongest reducing agent among the following is:

1. K

2. Na

3. Al

4. Mg

Subtopic:  Physical Properties |
 55%
From NCERT
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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

Subtopic:  Physical Properties |
 82%
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Which one of the following is formed on dissolving I2 in aqueous solution of KI ?

1. KIO4

2. KIO

3. KI3

4. KIO3

Subtopic:  Physical Properties |
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The correct statement among the following regarding CsBr3 is -

1. It is a covalent compound.

2. It contains Cs2+ and Br- ions.

3. It contains Cs+, Br- and Br2 lattice molecules.

4. It contains Cs+ and Br3- ions.

Subtopic:  Chemical Properties | Compounds of Ca and Na -Preparations, Properties & Uses |
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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 |
From NCERT
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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%
From NCERT
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NO2 is obtained by heating:

1. CsNO3

2. KNO3

3. LiNO3

4. NaNO3

Subtopic:  Chemical Properties |
 71%
From NCERT
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Soda lime is:

1. Na2CO3 + CaO

2. NaOH + NaHCO3

3. NaOH + CaO

4. NaH + Na2CO3

Subtopic:  Preparations, Properties & Uses of S Block Elements |
 67%
From NCERT
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Molecular formula of Glauber's salt is :

1. MgSO4·7H2O

2. CuSO4·5H2O

3. FeSO4·7H2O

4. Na2SO4·10H2O

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