Study of First Element Hydrogen Exe-6D Very Short Answer Chemistry Class-9 ICSE Selina Publishers

Study of First Element Hydrogen Exe-6D Very Short Answer Chemistry Class-9 ICSE Selina Publishers Solutions Chapter-6. Step By Step ICSE Selina Concise Solutions of Chapter-6 Study of First Element Hydrogen with All Exercise including MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type, Numerical and Structured/Application Questions Solved . Visit official Website CISCE for detail information about ICSE Board Class-9.

Study of First Element Hydrogen Exe-6D Very Short Answer Chemistry Class-9 ICSE Concise Selina Publishers

Board ICSE
Publications Selina Publication
Subject Chemistry
Class 9th
Chapter-6 Study of First Element Hydrogen
Book Name Concise
Topics Solution of Exercise – 6D Very Short Answer Type
Academic Session 2023-2024

D. Exercise – 6D Very Short Answer Type

Study of First Element Hydrogen Class-9 Chemistry Concise Solutions  

Page-118

Question 1.

Choose terms from the options given in brackets to complete these sentences.

(a) When CuO reacts with hydrogen, …………… is reduced to …………… and …………… is oxidized to …………… . (CuO, H2, Cu, H2O)

(b) Hydrogen is …………… soluble in water. (sparingly, highly, moderately)

(c) Metals like ……………, …………… and …………… give H2 with steam. (iron, magnesium, aluminium, sodium, calcium)

(d) Sodium …………… reacts smoothly with cold water. (metal, amalgam, in the molten state)

(e) A metal …………… hydrogen in the activity series gives hydrogen with …………… acid or …………… acid. (above, below, dilute hydrochloric, concentrated hydrochloric, dilute sulphuric).

Answer:

(a) When CuO reacts with hydrogen, CuO is reduced to Cu and H2 is oxidized to H2O

(b) Hydrogen is sparingly soluble in water.

(c) Metals like magnesium, iron and aluminium give H2 with steam.

(d) Sodium amalgam reacts smoothly with cold water.

(e) A metal above hydrogen in the activity series gives hydrogen with dilute hydrochloric acid or dilute sulphuric acid acid.


D. Exercise – 6D Very Short Answer Type

Study of First Element Hydrogen Class-9 Chemistry Concise Solutions  

Page-119

Question 2.

Name:

(a) an oxidizing agent that does not contain oxygen.

(b) a substance that oxidizes concentrated HCl to chlorine.

(c) a substance that will reduce aqueous Iron (III) ions to Iron (II) ions.

(d) a liquid that is an oxidizing as well as a reducing agent.

(e) a gas that is an oxidizing as well as a reducing agent.

(f) a solid that is an oxidizing agent.

Answer:

(a) Chlorine [Cl2]

(b) Manganese dioxide [MnO2]

(c) Hydrogen sulphide [H2S]

(d) Hydrogen peroxide [H2O2]

(e) Hydrogen [H2]

(f) Potassium permanganate [KMnO4]

Question 3.

Correct the following statements:

(a) Hydrogen is separated from CO by passing the mixture through caustic potash solution.

(b) All metals react with acids to give hydrogen.

(c) Hydrogen is dried by passing it through conc. H2SO4.

(d) Very dilute nitric acid reacts with iron to produce hydrogen.

(e) Conc. H2SO4 reacts with zinc to liberate hydrogen.

Answer:

(a) Hydrogen is separated from CO2 by passing the mixture through caustic potash solution.

(b) All the metals above hydrogen in the metal activity series react with acids to give hydrogen.

(c) Hydrogen is dried by passing it through fused calcium chloride.

(d) Very dilute nitric acid reacts with magnesium [Mg] and manganese [Mn] to produce hydrogen.

(e) Dilute H2SO4 reacts with zinc to liberate hydrogen.

—  : End of Study of First Element Hydrogen Exe-6D Very Short Answer Class-9 ICSE Chemistry Solutions :–

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