Free s-Block and p-Block Elements MCQs with Answers

• A. White
• B. Brown
• C. Blue
• D. Green

Explanation: Crystalline copper sulfate is commonly encountered as hydrated copper sulfate, CuSO4·5H2O, whose crystals are bright blue because of the…

• A. AgNO3
• B. CuSO4.5H2O
• C. K2Cr2O7
• D. K2CrO4

Explanation: Blue vitriol or blue stone is hydrated copper(II) sulfate, CuSO4.5H2O, whose water of crystallisation gives it a bright blue colour.

• A. CuSO3.4H2O
• B. CuSO4.4H2O
• C. CuSO3.5H2O
• D. CuSO4.5H2O

Explanation: The common crystalline form called copper sulfate is CuSO4.5H2O, containing five water molecules of crystallisation and appearing blue.

• A. 24
• B. 32
• C. 36
• D. 40

Explanation: For a bivalent metal, equivalent weight = atomic weight ÷ 2, so its atomic weight is 12 × 2 = 24.

• A. Ortho burate
• B. Meta borate
• C. Double oxide
• D. Tetra borate

Explanation: On heating, borax forms sodium metaborate, NaBO2, and boric anhydride, B2O3; in the bead test, the oxide then combines with a metal oxide…

• A. Ca and P
• B. S and P
• C. Ca and S
• D. we could not apply

Explanation: Gypsum is calcium sulfate dihydrate, CaSO4.2H2O, so it supplies calcium and sulfur to soil.

• A. Na2CO3
• B. K2CO3
• C. (NH4)2CO3
• D. CaCO3

Explanation: Most carbonates are insoluble in water, except those of Group I metals and ammonium.

• A. Sodium sulphate
• B. Potassium sulphate
• C. Zinc sulphate
• D. Barium sulphate

Explanation: Barium sulfate is highly insoluble because its crystal lattice is very stable and hydration does not compensate sufficiently for the…

• A. Si
• B. Ba
• C. Mg
• D. Ca

Explanation: Calcium is needed for normal plant growth and helps maintain the development of leaves and growing tissues.

• A. KCI
• B. KCI.MgCl2.6H2O
• C. Na2B4O7.10H2O
• D. CaCO3.MgCO3

Explanation: Carnallite is a hydrated double chloride with the formula KCl.MgCl2.6H2O.

• A. Acidic
• B. Basic
• C. Amphoteric
• D. Neutral

Explanation: BeO reacts with both acids and strong bases, so it is amphoteric: it forms beryllium salts with acids and beryllates in alkaline solution.

• A. O-2
• B. H+
• C. Cl-
• D. Na+

Explanation: The oxide ion, O-2, cannot remain in aqueous solution because it reacts immediately with water: O-2 + H2O forms OH- ions.

• A. CaSiO3
• B. Na2SiO3
• C. Ca3(PO4)2
• D. MnSiO3

Explanation: Calcium phosphate, Ca3(PO4)2, is a source of phosphorus and is used as a phosphate fertiliser.

• A. SiO2
• B. Fe2O3
• C. FeO
• D. CaO MgO

Explanation: Phosphorus and sulfur are acidic impurities, so the open-hearth furnace is lined with basic refractory materials such as CaO and MgO…

• A. FeS2
• B. HgS
• C. PbS
• D. ZnS

Explanation: Cinnabar is the naturally occurring red form of mercury(II) sulfide, HgS.

• A. KCI
• B. NaCI
• C. KCI MgCl2 6H2O
• D. Na2CO3. 10H2O

Explanation: Carnallite is the hydrated double salt KCl.MgCl2.6H2O, formed naturally in evaporite deposits.

• A. Be+2H2O?Be (OH)2+H2
• B. Be+H2O?Be (OH)2+H2
• C. Be+H2O?[Be (OH)4]+2+H2
• D. no reaction

Explanation: Beryllium does not normally react with water because a compact protective layer of beryllium oxide forms on its surface.

• A. CO²+O²
• B. CO+H²(water gas)
• C. CO³+H²O
• D. Laughing Gas

Explanation: Steam reforming of a hydrocarbon such as methane over nickel at about 900 °C gives carbon monoxide and hydrogen: CH4 + H2O → CO + 3H2.

• A. Peat
• B. Lignite
• C. Bituminous
• D. Anthracite

Explanation: Bituminous coal is commonly called soft coal because it is relatively soft and contains more volatile matter than anthracite.

• A. NaOH
• B. Cl²
• C. H²S
• D. Cu

Explanation: A Kipp apparatus generates gases on demand by allowing an acid to react with a solid such as iron sulfide; iron sulfide with dilute…