Granulated Zinc for Hydrogen

Q.

You are provided with two containers made up of copper and aluminium. You are also provided with solutions of dilute $\mathrm{HCl}$ dilute ${\mathrm{HNO}}_3$, ${\mathrm{ZnCl}}_2$ and ${\mathrm{H}}_2\mathrm{O}$. In which of the above containers these solutions can be kept?

Q.

What is an alloy? Name the constituents of (I) brass and, (ii) bronze. Give one use of bronze specifying the property on which the use is based.

Q.

Hydrogen gas is prepared by the action of dil. ${\mathrm{H}}_2{\mathrm{SO}}_4$ on _______.

Q.

Why are zinc granules used over zinc dust for the laboratory preparation of hydrogen gas?

1. Pure zinc is expensive

2. The reaction with pure zinc is slow

3. Pure zinc is unavailable

4. Reaction with pure zinc is too rapid

Q.

How will you prepare hydrogen gas in the laboratory ? State three precautions necessary for the collection of hydrogen.

Q.

What is granulated zinc?

Q.

What is an alloy? Name the alloys and their constituents used for making aeroplanes

Q. Granulated Zn is used in the laboratory preparation of hydrogen because it contains , which acts as a during the reaction.

1. Cu
2. Mg
3. reactant
4. catalyst

Q.

Which metal is used to prepare Hydrogen in the laboratory?

Q.

State what you would observe when: Dilute hydrochloric acid is added to zinc sulphide.

Q.

Which of the following does not contain aluminium?

1. Duralumin

2. Magnalium

3. German Silver

4. Alnico

Q.

What are alloys? Give the two names of alloys?

Q.

Mahima took two different test tubes and put zinc granules in one and in the other put zinc powder. She poured dilute sulphuric acid with the help of a glass rod in both the test tubes. Which of the test tubes would exhaust first?

1. Depends upon sulphuric acid

2. Cannot be ascertained

3. Test tube with granules

4. Test tube with powder

Q. Why hydrogen gas is non Metal if it loses electron

Q.

What happens when a burning splinter is brought near to the mouth of a gas jar containing Hydrogen$\left({\mathrm{H}}_2\right)$ gas?

Q.

For the laboratory preparation of hydrogen, give a fully labelled diagram.

Q.

Which impurity is present along with zinc in granulated zinc and what role does it play.

Q.

When dilute hydrochloric acid is added to zinc pieces taken in a test tube:

1. No changes take place

2. The color of the solution becomes yellow

3. A pungent-smelling gas gets liberated

4. Small bubbles of hydrogen gas appear on the surface of pieces of zinc

Q. Laboratory preparation of hydrogen

Q.

zinc which contains copper as an impurity

Q.

Describe the preparation of hydrogen in the laboratory.

Q.

Which is the most suitable metal for the preparation of Hydrogen through Laboratory method?

1. Lead

2. Zinc

3. Copper

4. Potassium

Q. How is hydrogen gas collected?

Q. Crude oil is pumped through which kind of pump?

1. Centrifugal
2. Gear
3. Skrew
4. Reciprocating

Q. Out of the following which one cannot be displaced by Mg?

1. Ferrous ion
2. Zinc ion
3. Sodium ion
4. Silver ion

Q. Hydrogen is ___________ soluble in water.

1. sparingly
2. highly
3. moderately
4. none of the above

Q.

GIVE REASON -

HYDROGEN GAS IS COLLECTED BY DOWNWARD DISPLACEMENT OF WATET?

Q.

Hydrogen gas is obtained in the laboratory by:

1. action of dil.$H_{2}S{O}_4$ on copper chips

2. action of dil.$H_{2}S{O}_4$ on iron fillings

3. action of dil.$H_{2}S{O}_4$ on zinc granules

4. action of dil.$H_{2}S{O}_4$ on aluminum foil

Q. State the relationship between oxidation and oxidising agent in a redox reaction. Give an example of redox reaction showing the relationship between oxidation and oxidising agent. (2 marks)

Q. Which among the following metals is mostly preferred for the laboratory preparation of hydrogen gas?

1. Lead
2. Zinc
3. Copper
4. Potassium