EASY
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When dilute hydrochloric acid is added to iron filings,

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Important Questions on Hydrogen

MEDIUM

Complete and balance the following reactions:

Zn + NaOH   ________+_______

MEDIUM
Hydrogen can be prepared with zinc by using alkali. Give an equation in each case.
MEDIUM
Explain why nitric acid and hot concentrated sulphuric acid are not used in the preparation of hydrogen.
MEDIUM

When hydrogen is passed over a black solid compound ‘A’, the products are a colourless liquid and a reddish brown metal ‘B’ The substance ‘B’ is divided into two parts and each part is placed in separate test tubes. To one part of the substance ‘B’ dil. HCI is added and to the other part dil. HNO3 is added.

What would you observe when dil. nitric acid reacts with substance ‘B’ ?

MEDIUM

Thin strips of three different metals A,B and C are known to be magnesium, copper and iron.

Write down that you would observe in case when the metals are treated as follows:

When each metal is treated with dilute hydrochloric acid and warmed, if necessary.

EASY

The diagram below is an arrangement of apparatus for preparing and collecting hydrogen.

Question Image

Name the substance X.

MEDIUM

Complete and balance the following reactions:

Al + KOH+H2O   ________+_______

MEDIUM

Represent the union of two sets by Venn diagram for each of the following.

X={x | x is a prime number between 80 and 100}

Y={y | y is an odd number between 90 and 100}

MEDIUM
Hydrogen can be prepared with zinc by using acid. Give an equation in this case.
MEDIUM
Write balanced equation of the reaction in the preparation of hydrogen from a solution of potassium hydroxide (other than by electrolysis).
MEDIUM

Complete the following word equations:

Sodium hydroxide + zinc Hydrogen + .........

MEDIUM
Name a metal whose hydroxide will give H2 with zinc.
HARD
Describe briefly with equations the Bosch Process for the large scale production of hydrogen.
MEDIUM

When hydrogen is passed over a black solid compound ‘A’, the products are a colourless liquid and a reddish brown metal ‘B’ The substance ‘B’ is divided into two parts and each part is placed in separate test tubes. To one part of the substance ‘B’ dil. HCI is added and to the other part dil. HNO3 is added.

Give two tests for the colourless liquid formed in the experiment.

MEDIUM
How would you obtain hydrogen from a mixture of hydrogen and carbon monoxide?
MEDIUM

The diagram below is an arrangement of apparatus for preparing and collecting hydrogen.

Question Image

Write the equation for the reaction which takes place with steam and X.

EASY
Cotyledons are also called-
MEDIUM
For each of the following reaction, describe what would you observe and name the reaction product that is responsible for the observation:
Zinc is added to dilute sulphuric acid.
MEDIUM
What would you observe when a piece of zinc is dropped into copper sulphate solution?
MEDIUM
Give a correctly balanced equation for the laboratory preparation of hydrogen from an alkali.