Complete and balance the following equation: Fe s + H 2 O g → Red heat

The equation can be completed and balanced as, 3 Fe s + 4 H 2 O g → Red heat Fe 3 O 4 s + 4 H 2 g Iron metal reacts in moist air by oxidation to give a hydrated iron oxide. It is a displacement reaction.

Complete the given table with respect to the formation of aluminium fluoride. Element Atomic number Electronic configuration Number of electrons donated or received Al 13 _____ _____ F 9 _____ _____

Electronic configuration is the distribution of electrons in different shells of an atom. Similarly, the number of electrons lost, donated or shared is the valency of that element. During the formation of aluminium fluoride, the electron transfer takes place. Therefore, the given table can be completed as, Element Atomic number Electronic configuration Number of electrons donated or received Al 13 2 , 8 , 3 3 (Donated) F 9 2 , 7 1 (Three chlorine atoms accept one electron each)

E M B I B E

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Metals and Non-Metals>Exercise>Q 44

MEDIUM

10th Rajasthan Board

IMPORTANT

Earn 100

(a) Give the names and formulae of one metal chloride and one non-metal chloride.
(b) State an important property in which these metal chloride and non-metal chloride differ.
(c) Why do they differ in this property?

Important Questions on Metals and Non-Metals

MEDIUM

10th Rajasthan Board

IMPORTANT

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Metals and Non-Metals>Exercise>Q 47

Explain why metals are able to conduct electricity.

EASY

10th Rajasthan Board

IMPORTANT

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Metals and Non-Metals>Exercise>Q 48

Gold has been known and used for thousands of years longer than aluminium. Explain why?

EASY

10th Rajasthan Board

IMPORTANT

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Metals and Non-Metals>Exercise>Q 49

State the property utilised in the following:

Metal alloys are used for making bells and strings of musical instruments.

MEDIUM

10th Rajasthan Board

IMPORTANT

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Metals and Non-Metals>Exercise>Q 50

Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-silicon and eka-aluminium.
(a) Name the elements which have taken the place of these elements.
(b) Mention the group and the period of these elements in the modern periodic table.
(c) How many valence electrons are present in each one of them?

EASY

10th Rajasthan Board

IMPORTANT

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Metals and Non-Metals>Exercise>Q 51

What is aqua-regia? Name two special metals which are insoluble in common reagents but dissolve in aqua-regia.

HARD

10th Rajasthan Board

IMPORTANT

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Metals and Non-Metals>Exercise>Q 52

Complete and balance the following equation:

$Fe (s) + H_{2} O (g) \overset{Red heat}{\to}$

HARD

10th Rajasthan Board

IMPORTANT

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Solved Science Paper-2>Exercise>Q 41

Complete the given table with respect to the formation of aluminium fluoride.

Element	Atomic number	Electronic configuration	Number of electrons donated or received
$Al$	$13$	_____	_____
$F$	$9$	_____	_____

MEDIUM

10th Rajasthan Board

IMPORTANT

Science Crash Course (Based on Revised Syllabus-2023)>Chapter 3 - Solved Science Paper-2>Exercise>Q 43

A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z