Metal which does not react with cold water but evolves H2 with steam is:

(a) Na

(b) K

(c) Pt

(d) Fe

Subtopic:  Hydrogen- Types & Isotopes | Water |
 56%
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Permutit is chemically known as:

1. Hydrated sodium aluminium silicate

2. Sodium hexa meta-phosphate

3. Sodium silicate

4. Sodium meta-aluminate

Subtopic:  Hard & Soft Water |
 69%
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Hydrogen is not obtained when zinc reacts with:

(a) cold water

(b) dil. H2SO4

(c) dil HCl

(d) hot 20% NaOH

Subtopic:  Hydrogen- Types & Isotopes | Preparation & Properties |
 72%
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Hydrogen peroxide is now generally prepared on industrial scale by the:

(1) Action of H2SO4 on barium peroxide

(2) Action of H2SO4 on sodium paraoxide

(3) Electrolysis of 50% H2SO4

(4) Burning hydrogen in excess of oxygen

Subtopic:  H2O2 (Hydrogen Peroxide) |
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Ionic hybrides are formed by:

(1) transition metals

(2) elements of very high electropositivity

(3) elements of very low electropositivity

(4) metalloids

Subtopic:  Type of Hydride |
 85%
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Very pure hydrogen (99.9%) can be made by which of the following processes ?

(1) Mixing natural hydrocarbons of high molecular weight

(2) Electrolysis of water

(3) Reaction of salt like hydrides with water

(4) Reaction of methane with steam

Subtopic:  Hydrogen- Types & Isotopes |
 73%
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Para hydrogen is-

1. Less stable than ortho hydrogen.

2. More stable than ortho hydrogen.

3. As stable as ortho hydrogen.

4. None of the above.

Subtopic:  Hydrogen- Types & Isotopes |
 55%
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Hydrogen combines directly with:

(a) Ca

(b) Cu

(c) Zn

(d) Fe

Subtopic:  Preparation & Properties |
 67%
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Acidified solution of chromic acid on treatement with H2O2 yields :

(a) CrO3 + H2O + O2

(b) Cr2O2 + H2O + O2

(c) CrO5 + H2O + K2SO4

(d) H2Cr2O7 + H2O + O2

Subtopic:  H2O2 (Hydrogen Peroxide) |
 54%
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The ortho and para hydrogen possess:

(a) same physical properties but different chemical properties

(b) different physical properties but same chemical properties

(c) same chemical and physical properties

(d) different physical and chemical properties

Subtopic:  Hydrogen- Types & Isotopes |
 62%
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