Chemistry Chapter 2 – s-Block Elements (Class 12) for FSC, Entry Tests & NTS Preparation
Chapter 2, s-Block Elements, is an important topic for Class 12 students preparing for FSC board exams and medical/engineering entry tests like MDCAT, NUMS, AKU, NUST, ECAT, and NTS exams. This chapter explains the properties, reactivity, and trends of s-block elements, including alkali and alkaline earth metals. Understanding s-block elements is essential for studying their chemical behavior, compounds, and applications in industry and daily life.
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Which one of these reacts rapidly with water at room temperature?
Point out the property which is not characteristic of alkali metal:
NUMS 2014
Chemistry
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Nascent hydrogen used in the formation of methane is obtained from the reaction of:
NTS 2010
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Caster kellners cell evaporated has replaced __________ because the Caster Kellner process evaporates__________?
NTS 2015 SMBBMC
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Which ions shall be removed to make hard water soft?
NUMS 2019 Cancelled
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Which of the following statements about H2S is false:
NTS 2010
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Magnesiums keep on burning in:
NUMS 2014
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Magnesium reacts with nitrogen to form:
PMC 2020
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Which of the following is chrome yellow’s pigment?
NTS 2015 SMBBMC
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Li is an element of group?
Group 1A and 11A are known as: ) s block elements d) P block elements
Red lead is:
NUMS 2014
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Which of the following is not true about caustic soda? a) It causes painful burns c) It is manufactured by Costner—Kellner process e) Both b and d
Which of the following oxides is most acidic oxide?
NUMS 2019 Reconduct
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The most dense element is:
NTS 2013
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Which of the following compounds is formed when sodium burns in excess of air?
NTS 2014
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Which alkaline earth metal make peroxide?
NUMS 2019 Reconduct
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What is the chemical formula for plaster of Paris?
NTS 2010
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When alkali metal react with water the fire Is produced clue to:
The false statement regarding saline hydrides is:
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Oxygen does not react with:
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The carbonates of alkali metals are soluble in water except:
NUMS 2020
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Which property of the Group II elements (magnesium to barium) and their compounds increases with an increasing proton (atomic) number?
NUMS 2016
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Hydrides which are prepared by passing hydrogen gas over hot alkali metals or alkaline earth metals are called:
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Pierrie Curie and Marie Curie isolated which radioactive element?
NTS 2015 SMBBMC
Biology
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Which of the following is unstable?
Which is the paramagnetic oxide of chlorine?
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Which of the following do not occur in Free State?
By heating 25g of limestone (CaCO3) , the weight of carbon dioxide produced is
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Which of the following is a major mineral of Lithium?
Melting point of Group I-A elements is than Group II-A elements
Which of the following statements is true?
NUMS 2014
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The lower part of the “Solvay tower” has been cooled during the manufacture of soda ash because:
NTS 2014
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Magnesium oxide is used in:
NTS 2015 DUHS and JSMU
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The flame colour of Ca in flame test is:
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The basic character of alkali metal oxides:
To avoid the formation of toxic compounds with chlorine, which substance is used for disinfecting water?
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Densities of alkali metals are low due to:
PMC 2020
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Sodium Is prepared by
Which one of the following is a common mineral of calcium? a
The chemical name of the baking powder is:
NTS 2011
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Which of the following is the correct order of electronegativity (from highest to lowest)?
NTS 2015 SMBBMC
Biology
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Which of the following elements has the highest boiling point?
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What is the chemical formula of Epsom Salt?
________ are prepared by passing hydrogen gas over hot alkali metals or alkaline earth metals?
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Most abundant salt of sodium in nature is:
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The ionization of Hydrogen atom gives:
NTS 2015 DUHS and JSMU
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Formula of Epsom salt is:
Chlorine upon reaction in cold NaOH yields:
NUMS 2014
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Metals belonging to the same group in the periodic table are
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Commercial hydrogen is obtained from:
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Rocky crust of earth is mainly composed of?
For Alkali Metals, decrease in the ionization potential is because of the increasing:
The nitrides of alkaline earth metals hydrolyse with water to form:
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Which is most basic in character?
NTS 2015 DUHS and JSMU
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Which of the following is least polarizable?
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Potassium, Rubidium, Cesium react with oxygen to form which types of oxides?
PMC 2020
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Which one of the following alkaline earth metal carbonates is thermally the most stable?
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Color of Epsom salt Is
7) Gypsum supplies to soil
Only two elements are present in:
NTS 2011
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Identify the correct statement:
NUMS 2014
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Aqueous solution of Na2CO3is:
NTS 2011
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Sodium reacts with water more vigorously than lithium because it:
NTS 2010
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Strontium lies between calcium and barium in Group II A in the Periodic Table. Which of the properties could be predicted for strontium?
NTS 2015 DUHS and JSMU
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When Gypsum is heated to about 100° C, it losses some water of crystallization and becomes:
NTS 2011
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States of Matter – Gases, Liquids and Solids
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Which of the following has the highest value of electronegativity?
PMC 2020
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Chemical Bonding
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Which one of the following statements is true?
NUMS 2016
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Key Concepts about s-Block Elements
The chapter explains the general characteristics of Group 1 (alkali metals) and Group 2 (alkaline earth metals) elements, including electronic configuration, physical and chemical properties, and trends in atomic and ionic radii. It covers the reactivity of metals with water, oxygen, and halogens, the formation of oxides and hydroxides, and the preparation and uses of important compounds. The chapter also discusses solubility, thermal stability, and the biological and industrial significance of s-block elements. Each concept is illustrated with examples, diagrams, and step-by-step explanations. These concepts are highly important for FSC board exams and entry tests like MDCAT, NUMS, AKU, NUST, and ECAT.
Free Entry Test Preparation
Mastery of s-block elements helps students understand chemical reactivity, solve numerical and conceptual problems, and apply concepts to industrial and biological processes. PLS Academy provides practice questions, solved past papers, and chapter-wise MCQs to help students revise these topics effectively. Regular study of this chapter improves problem-solving skills, conceptual clarity, and exam performance, ensuring students are well-prepared for FSC board exams, competitive entry tests, and NTS exams.
JazakAllah.
