Metals

Q.

What elements have the highest ionisation energy ?

Q.

Write down the ten uses of metals in daily life.

Q.

When zinc granules are added to dilute hydrochloric acid .what is happening around zinc granules? Is there any change in temperature?

Q.

What is group and period in the periodic table?

Q.

What happens when metal react with acid.

Q.

When metal X is treated with a dilute acid Y, then a gas Z is evolved which burns readily by making a little explosion.

(a) Name any two metals which can behave like metal X.

(b) Name any two acids which can behave like acid Y.

(c) Name the gas Z.

(d) Is the gas Z lighter than or heavier than air ?

(e) Is the reaction between metal X and dilute acid Y, exothermic or endothermic ?

(f) By taking a specific example of metal X and dilute acid Y, write a balanced chemical equation for the reaction which takes place. Also indicate physical states of all the reactants and products.

Q.

Complete the following reaction:

$\mathrm{Zn}+\mathrm{NaOH}\to$

Q.

Why are metals called electropositive elements whereas non-metals are called electronegative elements?

Q.

Is oxygen a metal or nonmetal?

Q.

The valency of magnesium is _____.

1. +1

2. +2

3. -1

4. -2

Q.

The electronic configuration of an element is 2, 8, 4. State its: (a) group and period in the Modern Periodic Table. (b) name and write its one physical property.

Q. Is there a metal gaseous at room temperature?

Q. Ionisation energy of helium is that of hydrogen.

1. more than
2. less than
3. equal to

Q.

Define pure metals.

Q.

An alkaline earth metal in period $3$ is?

Q.

The metal which exists as a liquid at room temperature is ___.

Q.

Which of the following Is the best conductor of heat?

1. Silver

2. Iron

3. Ice

4. Wood

Q.

Which of the following set represent correct for Malachite, Magnetite, Calamine & Cryolite?

1. ${\mathrm{CuCO}}_3,{\mathrm{Fe}}_2{\mathrm{O}}_3,\mathrm{ZnO},{\mathrm{Al}}_2{\mathrm{O}}_3$

2. ${\mathrm{CuCO}}_3.\mathrm{Cu}\left(\mathrm{OH}\right),{\mathrm{Fe}}_3{\mathrm{O}}_4,{\mathrm{ZnCO}}_3,{\mathrm{Na}}_3{\mathrm{AlF}}_6$

3. ${\mathrm{CuCO}}_3,{\mathrm{Fe}}_3{\mathrm{O}}_4,{\mathrm{ZnCO}}_3,{\mathrm{Al}}_2{\mathrm{O}}_3$

4. ${\mathrm{CuCO}}_3.\mathrm{Cu}\left(\mathrm{OH}\right),{\mathrm{Fe}}_2{\mathrm{O}}_3,{\mathrm{ZnCO}}_3,{\mathrm{Na}}_3{\mathrm{AlF}}_6$

Q.

Every metal is a solid at room temperature.

1. True

2. False

Q.

(a) On which side of the periodic table will you find metals?

(b) On which side of the periodic table will you find non-metals?

(c) What is the name of those elements which divide metals and non-metals in the periodic table?

Q.

Electric current can pass through a sheet of thermocol.

1. True
2. False

Q.

Which of the following statements is correct?

1. All metals are ductile.

2. All non-metals are ductile.

3. Generally, metals are ductile.

4. Some non-metals are ductile.

Q.

What do you mean by the Free State of a metal?

1. Elements existing in very pure and stable forms

2. Elements existing as elements (unreacted) but mixed with impurities

3. Elements in their compound form

4. Elements existing as gases

Q.

Question 3
Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
(i) Good thermal conductivity
(ii) Good electrical conductivity
(iii) Ductility
(iv) High melting point

(a) (i) and (ii) (b) (i) and (iii)

(c) (ii) and (iii) (d) (i) and (iv)

Q.

How can we say that a certain has higher electronegativity?

In Copper & Zinc which is more electronegative?

Q. Why electron gain enthalpy of alkali metals is negative but it should be positive because it has tendency to lose electrons not gain

Q.

State one use each of the following non-metals:
Copper, Aluminium, Iron, Silver, Gold, Mercury

Q. Metal which occurs in the native state is

1. $Na$
2. $Ca$
3. $Mn$
4. $Pt$

Q.

Is sodium an alkaline earth metal?

Q. What is the maximum number of electrons that can be accommodated in a shell whose principal quantum number ('n') is 4?

1. 10
2. 18
3. 54
4. 32