Page 270 - Chemistry ICSE Class X

256 ICSE Chemistry – 10

ϰ͘ ^ƵůƉŚƵƌŝĐ ĂĐŝĚ ĐĂŶ ĂĐƚ ĂƐ
;ĂͿ ĂŶ ĂĐŝĚ ;ďͿ Ă ĚĞŚLJĚƌĂƟŶŐ ĂŐĞŶƚ
;ĐͿ ĂŶ ŽdžŝĚŝƐŝŶŐ ĂŐĞŶƚ ;ĚͿ Ă ůĞƐƐ ǀŽůĂƟůĞ ĂĐŝĚ
/ůůƵƐƚƌĂƚĞ ƚŚĞƐĞ ƉƌŽƉĞƌƟĞƐ ďLJ ŐŝǀŝŶŐ ƐƵŝƚĂďůĞ ĞdžĂŵƉůĞƐ͘
ϱ͘ tŚĞŶ ĐŽŶĐĞŶƚƌĂƚĞĚ ƐƵůƉŚƵƌŝĐ ĂĐŝĚ ŝƐ ĂĚĚĞĚ ƚŽ ƐƵŐĂƌ͕ Ă ƐƉŽŶŐLJ ďůĂĐŬ ŵĂƐƐ ŝƐ ŽďƚĂŝŶĞĚ͘ 'ŝǀĞ ĂŶ ĞdžƉůĂŶĂƟŽŶ͘
ϲ͘ EĂŵĞ ƚŚĞ ŐĂƐ ĞǀŽůǀĞĚ ŝŶ ĞĂĐŚ ŽĨ ƚŚĞ ĨŽůůŽǁŝŶŐ͗
;ĂͿ ŝŶĐ ŝƐ ƚƌĞĂƚĞĚ ǁŝƚŚ ĚŝůƵƚĞ ƐƵůƉŚƵƌŝĐ ĂĐŝĚ͘
;ďͿ ĂƌďŽŶ ŝƐ ŚĞĂƚĞĚ ǁŝƚŚ ĐŽŶĐ͘ ƐƵůƉŚƵƌŝĐ ĂĐŝĚ͘
ϳ͘ 'ŝǀĞ ƚŚĞ ŶĂŵĞ ĂŶĚ ĨŽƌŵƵůĂ ŽĨ ƚŚĞ ĂĐŝĚ ƐĂůƚ ŽĨ ƐƵůƉŚƵƌŝĐ ĂĐŝĚ͘
ϴ͘ ;ĂͿ tŚĂƚ ǁŽƵůĚ LJŽƵ ƐĞĞ ǁŚĞŶ Ă ĐƌLJƐƚĂů ŽĨ ĐŽƉƉĞƌ ƐƵůƉŚĂƚĞ ƉĞŶƚĂŚLJĚƌĂƚĞ ŝƐ ƉůĂĐĞĚ ŝŶ ĐŽŶĐ͘ ƐƵůƉŚƵƌŝĐ ĂĐŝĚ͍
;ďͿ tŚŝĐŚ ƉƌŽƉĞƌƚLJ ŽĨ ƐƵůƉŚƵƌŝĐ ĂĐŝĚ ŝƐ ƵƐĞĚ ŝŶ ƚŚŝƐ ƌĞĂĐƟŽŶ͍

Let us Answer Some More Questions

1. Draw the electron dot structure of sulphuric acid.
2. Name the scientist who developed the Contact process for the manufacture of sulphuric acid.
3. Why is sulphuric acid referred to as
(a) king of chemicals? (b) oil of green vitriol?
4. Which concentrated acid will oxidise sulphur directly to sulphuric acid? Write the equation for the same.
5. Why is conc. sulphuric acid added slowly into water and not water into conc. sulphuric acid to prepare dilute
sulphuric acid (or battery acid)?
6. Why should the impurity of arsenic oxide be removed before passing the mixture of SO and air through the
2
catalytic chamber for producing SO ?
3
7. (a) Name the process used for the large-scale manufacture of sulphuric acid.
(b) Which property of sulphuric acid accounts for its use as a dehydrating agent?
(c) Concentrated sulphuric acid is both an oxidising agent and a nonvolatile acid. Write one equation each to
illustrate the above mentioned properties of sulphuric acid.
8. Name the products formed when hot conc. sulphuric acid is reacted with the following:
(a) sugar (b) carbon (c) sulphur (d) CuSO .5H O (e) copper turnings
2
4
9. 9JCV LWUVKſGU UWNRJWTKE CEKF DGKPI ECNNGF VJG ŎMKPI QH EJGOKECNUŏ! 9J[ FQGU UWICT VWTP DNCEM KP EQPVCEV YKVJ
concentrated sulphuric acid?
10. &GUETKDG DTKGƀ[ VJG Ŏ%QPVCEV RTQEGUUŏ HQT VJG OCPWHCEVWTG QH UWNRJWTKE CEKF 9TKVG VJG EJGOKECN GSWCVKQPU HQT
the reactions taking place during the process. Describe an activity to show that concentrated sulphuric acid is a
powerful dehydrating agent.
11. State the steps involved in the manufacture of oleum from sulphur. Write the chemical equations for the reactions
involved.
12. “Sulphuric acid is a dibasic acid.” Write two reaction equations to justify this statement and name the reaction
products in the two cases.
13. Name the gas evolved when dilute sulphuric acid reacts with sodium carbonate. Write the chemical equation for
the reaction involved.
14. 4GHGT VQ VJG ƀQYUJGGV FKCITCO IKXGP CNQPIUKFG CPF CPUYGT VJG HQNNQYKPI
(a) Name the catalyst which helps in the conversion of sulphur dioxide to sulphur
trioxide in step C.
(b) In the Contact process for the manufacture of sulphuric acid, sulphur trioxide
is not converted to sulphuric acid by reacting it with water. Instead a two-
steps procedure is used. Write the equation for the two steps involved in D.
(c) What type of substance will liberate sulphur dioxide from sodium sulphite in
step E?
(d) Write the equation for the reaction by which sulphur dioxide is converted to
sodium sulphite in step F.