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Anomalous Behavior of Lithium Halogens

A student is ...

Question

A student is given samples of three elements X, Y, and Z, which could be an alkali metal, a member of group IVA, and a member of group VA. He makes the following observations:

Element X has a metallic luster and conducts electricity. It reacts slowly with $H C l$ to produce $H_{2}$ gas. Element Y is a light-yellow solid that does not conduct electricity. Element Z has a metallic luster and conducts electricity. When exposed to air, it slowly forms a white powder giving a basic solution in water.

Element X can be

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Solution

The correct options are
A Pb
B Sn
Element $X$ is either tin or lead. It has a metallic luster and conducts electricity. It reacts slowly with $H C l$ to produce $H_{2}$ gas.

$P b + 2 H C l \to P b C l_{2} + H_{2} ↑$

$S n + 4 H C l \to P b C l_{4} + 22 H_{2} ↑$

Element $Y$ is phosphorous. It is a light-yellow solid that does not conduct electricity.
Element $Z$ is an alkali metal such as sodium. It has a metallic luster and conducts electricity. When exposed to air, it slowly forms a white powder giving a basic solution in water.

$2 N a + O_{2} \to N a_{2} O_{2}$

$2 N a + 2 H_{2} O \to 2 N a^{+} + 2 O H^{-} + H_{2} ↑$ .

So, the correct options are $A$ and $D$

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Similar questions

Q. A student is given samples of three elements,

X, Y

, and

Z

, which could be an alkali metal, a member of group IVA, and a member of group VA. She makes the following observations
The element

X

has a metallic luster and conducts electricity. It reacts slowly with aq

H C l

to produce

H_{2}

gas. The element

Y

is a light-yellow solid and does not conduct electricity. The element

Z

has a metallic luster and conducts electricity. When exposed to air, it slowly forms a white powder aqueous solution of which is basic. What can you conclude about the elements from these observations?

X

can be:

Q. A solid element symbol (

Y

) conducts electricity and forms two chlorides

Y C l_{n}

(a colourless volatile liquids) and

Y C l_{n - 2}

(a colourless solid). To which of the following groups of the periodic table does

Y

belong?

Q. An element

X

(Atomic number

12

) reacts with another element

Y

(atomic number

17

) to form a compound

Z

. Which of the following statements are true regarding this compound?
I. Molecular formula of

Z

X Y_{2}

.
II. It is soluble in water.
III.

X

and

Y

are joined by sharing of electrons.
IV. It would conduct electricity in the molten state.

Question 45
Complete the following cross word puzzle (Figure 5.1)

Across: (1) An element with atomic number 12.

(3) Metal used in making cans and member of Group 14

(4) A lustrous non-metal which has 7 electrons in its outermost shell.

Down: (2) Highly reactive and soft metal which imparts yellow colour when subjected to flame and is kept in kerosene.

(5) The first element of second Period

(6) An element which is used in making fluorescent bulbs and is second member of Group 18 in the Modern Periodic Table

(7) A radioactive element which is the last member of halogen family.

(8) Metal which is an important constituent of steel and forms rust when exposed to moist air.

(9) The first metalloid in Modern Periodic Table whose fibres are used in making bullet-proof vests

Complete the following cross word puzzle (Figure 5.1)