Metals

Q.

what are the soft metals?

Q. Magnesium ribbon is rubbed with sand paper before burning it. The reason of rubbing the ribbon is to:

1. Remove magnesium oxide formed over the surface of magnesium.
2. Remove moisture condensed over the surface of the ribbon.
3. Generate heat due to an exothermic reaction.
4. Mix silicon with magnesium with sandpaper (silicon dioxide) for lowering ignition temperature of the ribbon.

Q.

Name one metal and one non-metal which exist as liquids at room temperature.

Q.

You are given a hammer, a battery, a bulb, wires and a switch.

How could you use them to distinguish between samples of metals and non-metals?

Q.

What are metals? Give some examples.

Q. Question 1
Which of the following statements is not a correct statement about the trends when going from left to right across the periods of the periodic table?

1. The elements become less metallic in nature.
2. The number of valence electrons increases.
3. The atoms lose their electrons more easily.
4. The oxides become more acidic.

Q.

What is meant by saying that metals are sonorous ?

Q.

Calcium lies above Sodium in the reactivity series.

1. True
2. False

Q.

Is Neon a "metal" or "non-metal"?

Q. What is the Latin name of iron?

1. Argentum
2. Kalium
3. Ferrum
4. Aurum

Q.

Metals can be drawn into thin wires. This is because:

1. They are sonorous

2. They are lustrous

3. They are ductile

4. They are malleable

Q.

What is meant by saying that metals are lustrous ?

Q.

The general electronic configuration of the transition elements is

Q. is the only metal which exists in liquid state at room temperature.

1. Bromine
2. Mercury
3. Sodium
4. Aluminium

Q.

Compare the properties of metals and non-metals with respect to (i) malleability (ii) ductility, and (iii) electrical conductivity.

Q.

Question 17
Arrange the following elements in the order of their decreasing metallic character
Na, Si, Cl, Mg, Al

(a) Cl > Si >Al > Mg >Na
(b) Na >Mg >Al >Si > Cl
(c) Na > Al > Mg > Cl > Si
(d) Al > Na> Si > Ca> Mg

Q.

Arrange the following elements in the order of their decreasing metallic character Na, Si, Cl, Mg, Al

1. Na >Mg >Al >Si > Cl
2. Na > Al > Mg > Cl > Si
3. Al > Na> Si > Ca> Mg
4. Cl > Si >Al > Mg >Na

Q.

Why the reaction of Iron oxide with Aluminum is used to join cracked Iron parts of machines?

Q.

Name two metals which are highly malleable and ductile

Q.

The symbol of a metal element which is used in making thermometers is:

1. Ag

2. Hg

3. Mg

4. Sg

Q. The property by which metals can be beaten into sheets is known as _______.

1. lustre
2. ductility
3. malleability
4. sonority

Q. Assertion: Metals are ductile
Reason: They are generally brittle in the solid state, they break into pieces when hammered.

1. Both assertion and reason are correct and reason is the correct explanation for assertion.
2. Both assertion and reason are correct but reason is not the correct explanation for assertion.
3. Assertion is correct but the reason is incorrect.
4. Both the assertion and reason are incorrect.

Q.

Name a liquid which can be classified as a pure substance and conducts electricity.

Q.

(a) What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.

(b) Classify the following into metals, non-metals and metalloids :

Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium.

Q.

What is meant by saying that metals are malleable and ductile ?

Q.

State any two properties for believing that aluminium is a metal.

Q. is the only metal which exists in liquid state at room temperature.

1. Bromine
2. Mercury
3. Sodium
4. Aluminium

Q.

Copper, gold, and aluminium are

1. Metals

2. Metalloids

3. Non-metals

Q. Question 1(iv)
Give an example of a metal which is a poor conductor of heat.

Q. The melting point of gallium is ${30}^{\circ }\text{C}$. Then its freezing point will be ____${}^{\circ }\text{C}$.

1. 30