Chemical Properties of Metals

Q. Consider the given statements and choose the correct option.

Statement-I: Metal chlorides are usually ionic solids and conduct electricity in aqueous solutions and molten state.

Statement-II: Reactive metals such as Na, K and Ca react with hydrogen and produce respective metal hydrides.

1. 
   Only statement-I is correct
2. 
   Only statement-II is correct
3. 
   Both the statements are correct
4. 
   Both the statements are incorrect

Q.

Question 31
During the reaction of some metals with dilute hydrochloric acid, following observations were made.

(a) Silver metal does not show any change.

(b) The temperature of the reaction mixture rises when aluminium (Al) is added.

(c) The reaction of sodium metal is found to be highly explosive.

(d) Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.

Explain these observations giving suitable reasons.

Q.

Borax bead test is used to identify the nature of cation present in solution by observing the colour of the bead. The colour and bead of copper formed during its borax bead test in a hot oxidising flame is

Q.

On heating copper powder in air the surface of copper powder becomes coated with black CuO . How can this black coating be converted into brown copper? Write a chemical equation for the reaction that occurs during the colour change.

Q.

What are the electron configurations of lithium, oxygen, nitrogen, and potassium?

Q.

What is the electronic configuration of $\mathrm{Cl}$ ?

Q.

When a copper strip is placed in a solution of silver nitrate, what happens to the colour of the solution?

1. No change in the colour of the solution

2. The solution turns pink

3. The solution turns blue

4. The solution turns red

Q. The metal M reacts vigorously with water to form a solution S and a gas G . The solution is turned red litmus to blue where as gas G which is lighter than air burns with a pop sound . Metal M has a low melting point and it is used as coolant in nuclear reactor
a) what is metal M
b) what is solution S? Is it acidic or alkaline
c) what is gas G
d) write a balanced chemical equation for the reaction which takes place when metal M reacts with water
e) is this reaction exothermic or endothermic

Q. Explain the following:
Zinc is used to cover iron so as to prevent rusting of iron. Why

Q.

Give one example in each case :

(a) A basic oxide which is soluble in water,

(b) A hydroxide which is highly soluble in water,

(c) A basic oxide which is insoluble in water,

(d) A hydroxide which is insoluble in water,

(e) A weak mineral acid,

(f) A base which is not an alkali,

(g) An oxide which is a base,

(h) A hydrogen containing compound which is not an acid,

(i) A base which does not contain a metal ion.

Q.

Why is it that non metals do not displace hydrogen from dilute acids?

Q. Which is the element with the most metallic character?

Q.

Which is the only liquid non metal

Q.

(a) Name a metal for each case:
(i) it does not react with cold as well as hot water but reacts with steam.
(ii) It does not react with any physical state of water.

(b) When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding sodium metal to water catches fire. Why is it so?

Q.

What happens when calcium reacts with water?

Q. Which of the following metals on reaction with cold water liberates hydrogen gas but does not float on water (unlike Calcium) due to its vigorous reaction (with water)?

1. Sodium (Na)
2. Calcium (Ca)
3. Gold (Au)
4. Zinc (Zn)

Q.

Is calcium hydroxide an alkali or an insoluble base? The book says it's an alkali (soluble in water) but when NaOH reacts with Calcium Nitrate, we get insoluble ppt. of Calcium hydroxide (insoluble in water). What is correct?

Q. What is the volume ratio of nitric acid to hydrochloric acid in Aqua-regia?

1. 3:1
2. 1:3
3. 1:1
4. 2:1

Q.

How does silver holds the valency of 1, 2 and 3? How to find valency of other elements which have more than two valency?

Q.

Which of the following metal reacts with steam to give metal oxide?

1. Sodium

2. Potassium

3. Calcium

4. Aluminium

Q.

Name two metals that are liquid at room temperature.

Q.

What is the ground-state electron configuration of the element Germanium?

Q.

What is the relationship between the electronic configuration of an element and its valency?

Q. Assertion: Aluminium is used as a reducing agent in the extraction of chromium from its oxide, $C{r}_2{O}_3$.
Reason: Reduction by Aluminium is known as Gold Schmidt thermite process or Aluminothermic process.

1. Both assertion and reason are true and the reason is the correct explanation of assertion.
2. Assertion is true but the reason is false.
3. Both assertion and reason are true but the reason is not the correct explanation of assertion
4. Both assertion and reason are false.

Q. Dilute hydrochloric acid reacts with marble chips to produce a gas X. When gas X is passed through limewater, a white precipitate Y is formed. Identify X and Y.

[1 mark]

1. $X:C{O}_2;Y:CaC{O}_3$
2. $X:C{O}_2;Y:Ca{\left(HC{O}_3\right)}_2$
3. $X:CO;Y:CaC{O}_3$
4. $X:CO;Y:Ca{\left(HC{O}_3\right)}_2$

Q.

The electronic configuration of an element X is 2, 8, 6.

i. What is the number of valence electron in an atom of X?

ii. Is it a metal or a non-metal?

Q. Give the reasons for the following:
(i) Zinc is used in galvanisation and dry cells.
(ii) Nitric acid can be stored in aluminium containers.
(iii) Aluminium oxide cannot be reduced by carbon.
(iv) A neutral gas other than oxygen is formed at the anode during electrolysis of fused alumina.
(v) Extraction of aluminium was very difficult in the beginning.
(vi) Carbon anodes are used in the electrolytic extraction of aluminium.
(vii) Galvanized metal ions should not be used for storing food.

Q. Which non-metal is used for making tips of match sticks?

1. Nitrogen
2. Graphite
3. Phosphorus
4. Sulphur

Q. why francium is not the most electro positive element?

Q.

State on what special properties the use of each of these metals depends:

(a) aluminium, (b) zinc?