Ncert Solutions Chemistry Class 11th
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11.51 Why does the tendency for catenation decreases in the order C > Si > Ge > Sn?
11.51 Why does the tendency for catenation decreases in the order C > Si > Ge > Sn?
The catenation depends on the strength of the element-element bond. As we move down the group 14, the element-element bond energies decrease rapidly, viz. C–C (355 kJ mol–1), Si–Si (222 kJ mol–1), Ge–Ge (167 kJ mol–1) and Sn–Sn (155 kJ mol–1), so the tendency for catenation decreases in the order C
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Carbon atoms have the tendency to linkwith one another through covalent bonds to form chains and rings. This property is calledcatenation. This is because C—C bonds are very strong.
Upvote Question Answers
Q.11.49 Why Boron differs from aluminium and other members of group 13 in a number of properties?
Question Answers
Q.11.49 Why Boron differs from aluminium and other members of group 13 in a number of properties?
Boron shows anomalous behaviour due to small atomic size, high electronegativity, high ionization energy and absence of d-orbital of B
Upvote 11.48 The basic building unit of all silicates is
(a) SiO24- (b) SiO44- (c) SiO42- (d) SiO-
11.48 The basic building unit of all silicates is
(a) SiO24- (b) SiO44- (c) SiO42- (d) SiO-
(b) SiO44- is the basic unit of all silicates.
Upvote 11.46 What is producer gas?
(a) mixture of CO and N2 in the ratio of 2 :1
(b) mixture of CO and N2 in the ratio of 1 :1
(c) mixture of CO and N2 in the ratio of 1 :2
(d) mixture of CO and N2 in the ratio of 3 :1
11.46 What is producer gas?
(a) mixture of CO and N2 in the ratio of 2 :1
(b) mixture of CO and N2 in the ratio of 1 :1
(c) mixture of CO and N2 in the ratio of 1 :2
(d) mixture of CO and N2 in the ratio of 3 :1
(a) Producer gas is a mixture of CO and N2 in the ratio of 2 :1
Upvote 11.45 Anhydride of carbonic acid is:
(a) H2CO3 (b) CO3 (c) CO- (d) CO2
11.45 Anhydride of carbonic acid is:
(a) H2CO3 (b) CO3 (c) CO- (d) CO2
(d) CO2 is regarded as anhydride of carbonic acid.
H2CO3 ————> H2O + CO2
Upvote MCQs
11.44 Which of the following statement is incorrect?
(a) Non-metals and metalloids exist only in the p-block of the periodic table.
(b) The non-metallic character of elements decreases down the group.
(c) The change of non-metallic to metallic character can be best illustrated by the nature of oxides they form.
(d) The non-metal oxides are basic whereas metal oxides are acidic or neutral in nature
MCQs
11.44 Which of the following statement is incorrect?
(a) Non-metals and metalloids exist only in the p-block of the periodic table.
(b) The non-metallic character of elements decreases down the group.
(c) The change of non-metallic to metallic character can be best illustrated by the nature of oxides they form.
(d) The non-metal oxides are basic whereas metal oxides are acidic or neutral in nature
(d) is an incorrect statement because non-metal oxides are acidic or neutral whereas metal oxides are basic in nature.
Upvote 11.43. Assertion: Boron halides form addition compounds with NH3.
Reason: Boron halides are Lewis bases.
11.43. Assertion: Boron halides form addition compounds with NH3.
Reason: Boron halides are Lewis bases.
(c) Boron halides are Lewis acids and can accept a pair of electrons from amines to form addition product.
Upvote 11.42. Assertion: Heavier elements form pπ– pπ bonds.
Reason: Their atomic orbitals are too large and diffuse to have effective overlapping.
11.42. Assertion: Heavier elements form pπ– pπ bonds.
Reason: Their atomic orbitals are too large and diffuse to have effective overlapping.
(d) Heavier elementsdo not form pπ– pπ bonds because their atomicorbitals are too large and diffuse to haveeffective overlapping.
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