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Answered 4 days ago CBSE/Class 11/Science/Chemistry/Unit 9-Hydrogen CBSE/Class 11/Science/Chemistry

On treatment of hard water with zeolite, sodium ions get exchanged with (a) Ca2+ ions (b) Mg2+ ions... read more
On treatment of hard water with zeolite, sodium ions get exchanged with
(a) Ca2+  ions
(b) Mg2+ ions
(c) H+ ions
(d) OH read less

Sapna Tyagi

Tutor

Na ions get exchanged with mg ions and Ca ions
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Answered 3 days ago CBSE/Class 11/Science/Chemistry/Unit 9-Hydrogen CBSE/Class 11/Science/Chemistry

Water is responsible for moderation of body temperature. How?

Vittal V Kurisetty

Efficient & Internationally Recognized Teacher of Biology/Genetics/Genomics/Cell & Molecular Biology

Water bcoz of its high heat capacity and specific heat, it disperses the heat evenly throughout the body by maintaining the equal temperature.
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Answered 3 days ago CBSE/Class 11/Science/Chemistry/Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals) CBSE/Class 11/Science/Chemistry

What happens when (i) Sodium metal is dropped in water? (ii) Sodium metal is heated in free supply of... read more
What happens when
(i) Sodium metal is dropped in water?
(ii) Sodium metal is heated in free supply of air?
(iii) Sodium peroxide dissolves in water? read less

Tarun Raj

1. When sodium metal is dropped in water it reacts with water to form colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2) 2. When sodium metal is heated it reacts to form sodium oxide. 3. It is hydrolysed when it’s dissolved in water, to produce sodium hydroxide and hydrogen peroxide: Na2O2... read more

1. When sodium metal is dropped in water it reacts with water to form colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2)

2. When sodium metal is heated it reacts to form sodium oxide.

3. It is hydrolysed when it’s dissolved in water, to produce sodium hydroxide and hydrogen peroxide:

Na2O2 + H2O → 2NaOH + H2O2

 

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Answered 4 days ago CBSE/Class 11/Science/Chemistry/Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals) CBSE/Class 11/Science/Chemistry

Which one of the following alkali metals give hydrated salts?
(a) Li (b) Na (c) K (d) Cs

Sivananda S.

Trainer

Li and Na only
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Asked 2 days ago CBSE/Class 11/Science/Chemistry/Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals) CBSE/Class 11/Science/Chemistry

The oxide of which of the following metals is amphoteric? (a) Pb (b) Mg (c) Ca (d) Al read more
The oxide of which of the following metals is amphoteric?
(a) Pb (b) Mg  (c) Ca (d) Al read less

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Asked 2 days ago CBSE/Class 11/Science/Chemistry/Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals) CBSE/Class 11/Science/Chemistry

Which out of the following can be used to store an alkali metal? H2O, C2H5OH and Benzene read more
Which out of the following can be used to store an alkali metal?
H2O, C2H5OH and Benzene read less

Answer

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Asked 2 days ago CBSE/Class 11/Science/Chemistry/Unit 11-Some p -Block Elements CBSE/Class 11/Science/Chemistry

ketch the structure of two allotropes of carbon namely diamond and graphite. read more
ketch the structure of two allotropes of carbon namely diamond and graphite. read less

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Answered 4 days ago CBSE/Class 11/Science/Chemistry/Unit 9-Hydrogen CBSE/Class 11/Science/Chemistry

Why does hydrogen occur in a diatomic form rather than in a monoatomic form under normal conditions? read more
Why does hydrogen occur in a diatomic form rather than in a monoatomic form under normal conditions? read less

Shikha Singh

Math Magician

to fulfill the stability of 1s orbital 2 electrons must be there and for making hydrogen stable it forms molecule by combining with one more electron hence exist in diatomic form.
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Asked 3 days ago CBSE/Class 11/Science/Chemistry/Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals) CBSE/Class 11/Science/Chemistry

Name the alkaline earth metals whose salt do not impart colour to a non-luminous flame. read more
Name the alkaline earth metals whose salt do not impart colour to a non-luminous flame. read less

Answer

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