p-Block Elements-II Additional Practice Test

12th Standard Chemistry — p-Block Elements-II: Additional Online Practice Test

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Which of the following compounds found in the earth's crust is commonly referred to as Chile saltpetre?

A.Sodium nitrate B.Potassium nitrate C.Ammonium nitrate D.Calcium nitrate

Which allotropic form of phosphorus is poisonous, has a characteristic garlic smell, and exhibits the phenomenon of phosphorescence?

A.Red phosphorus B.Black phosphorus C.White phosphorus D.Violet phosphorus

In the molecular structure of phosphorous trioxide (\(P_{4}O_{6}\)), how many oxygen atoms are positioned along the edges of the tetrahedron?

A.Four B.Six C.Eight D.Ten

Which of the following is the most abundant element in the earth's crust by weight, making up approximately 46.6%?

A.Silicon B.Aluminium C.Oxygen D.Sulphur

Sulphur exists in multiple allotropic modifications. Which forms are designated as \(\alpha\)-sulphur and \(\beta\)-sulphur?

A.Plastic and milk sulphur B.Colloidal and plastic sulphur C.Rhombic and monoclinic sulphur D.Amorphous and crystalline sulphur

Which of the following is the primary mineral source for the commercial extraction of fluorine?

A.Cryolite B.Fluorspar C.Fluorapatite D.Sodium chloride

Why is hydrofluoric acid (HF) classified as a weak acid, unlike the other binary acids of halogens?

A.Fluorine is the least electronegative B.It has the lowest bond dissociation enthalpy C.Strong hydrogen bonding and high bond enthalpy D.It does not form any hydrogen bonds

Which Group 18 element is characterized by having the smallest atomic radius and the highest first ionisation energy?

A.Neon B.Argon C.Helium D.Xenon

In the medical field, which radioactive noble gas is sealed in small capsules and used to destroy malignant cancer growth?

A.Radon B.Krypton C.Xenon D.Argon

Q10

When white phosphorus is heated with a strong solution of sodium hydroxide in an inert atmosphere, which gas is produced along with sodium hypophosphite?

A.Ammonia B.Phosphine C.Nitrogen D.Oxygen

Q11

Which xenon fluoride is prepared by the direct reaction of xenon and fluorine in a 1:20 volume ratio at 400°C?

A.\(XeF_{2}\) B.\(XeF_{4}\) C.\(XeF_{6}\) D.\(XeOF_{4}\)

Q12

In the contact process for the industrial manufacture of sulphuric acid, what is used as the catalyst for the oxidation of \(SO_{2}\) to \(SO_{3}\)?

A.Finely divided iron B.Nickel powder C.Vanadium pentoxide D.Manganese dioxide

Q13

Which of the following describes the chemical property of ozone (\(O_{3}\)) that makes it effective in disinfecting swimming pools?

A.It is a weak reducing agent B.It is a strong oxidising agent C.It is chemically inert D.It is a highly stable gas

Q14

Which property is responsible for the phosphine gas (\(PH_{3}\)) being used in smoke screens during naval signaling?

A.It is highly flammable B.It produces dense white fumes of \(P_{2}O_{5}\) C.It is a colorless gas D.It has a characteristic smell

Q15

Which oxoacid of phosphorus is prepared by the hydrolysis of phosphorous trioxide (\(P_{4}O_{6}\)) with cold water?

A.Hypophosphorous acid B.Orthophosphorous acid C.Orthophosphoric acid D.Pyrophosphoric acid

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About this p-Block Elements-II test

This free online practice test covers p-Block Elements-II from the 12th Standard Chemistry (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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