Previous Year Paper year:2019 : ICSE-X-Chemistry

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ICSE-X-Chemistry

Previous Year Paper year:2019

with Solutions - page 3

#1-f

#1-f-i
Give the IUPAC name of the following organic compounds:
[5]

1.

2.

Ans : 1. Prop - 1 - yne or propyne

2. Ethanal

#1-f-ii
What is the special feature of the structure of ethyne ?

Ans : Ethanal

Special feature of the structure of ethyne is the presence of triple bond.

#1-f-iii
Name the saturated hydrocarbon containing two carbon atoms.

Ans : Ethane

#1-f-iv
Give the structural formula of Acetic acid.

Ans : Acetic acid (CH₃COOH)

#1-g
Give the appropriate term defined by the statements given below:
[5]

#1-g-i
The formula that represents the simplest ratio of the various elements present in one molecule of the compound.

Ans : Empirical formula

#1-g-ii
The substance that releases hydronium ion as the only positive ion when dissolved in water.

Ans : Acid

#1-g-iii
The tendency of an atom to attract electrons totvards itself when combined in a covalent compound.

Ans : Electronegativity

#1-g-iv
The process by which certain ores, specially carbonates, are converted to oxides in the absence of air.

Ans : Calcination

#1-g-v
The covalent bond in-which the electrons are shared equally between the combining atoms.

Ans : Non-polar covalent bond

#1-h

#1-i
Arrange the following according to the instructions given in brackets :
[5]

#1-i-i
K, Pb, Ca, Zn. (In the increasing order of the reactivity)

Ans : Pb < Zn < Ca < K

(According to the position in reactivity series)

#1-i-ii
Mg²⁺, Cu²⁺, Na¹⁺, H¹⁺ (In the order of preferential discharge at the cathode)

Ans : Na¹⁺ < Mg²⁺ < H¹⁺ < Cu²⁺

(According to electrochemical series of metals)