189729
Solid \(C{O_2}\) is known as dry ice, because
1 It melts at \(0\,^°C\)
2 It evaporates at \(40\,^°C\)
3 It evaporates at \( - 78\,^\circ C\) without melting
4 Its boiling point is more than \(199\,^°C\)
Explanation:
(c) Solid \(C{O_2}\) is knows as dry ice because it evaporates at \(-78\,^°C\) without changing in the liquid state.
11. THE P-BLOCK ELEMENTS
189730
Which one of the following statements about the zeolites is false
1 Zeolites are aluminosilicates having three dimensional network
2 Some of the \(SiO_4^{ - 4}\) units are replaced by \(AlO_4^{ - 5}\) and \(AlO_6^{9 - }\) ions in zeolites
3 They are used as cation exchangers
4 They have open structure which enables them to take up small molecules
Explanation:
(b) Zeolite have \(Si{O_4}\) and \(Al{O_4}\) tetrahedrons linked together in a three dimensional open structure in which four or six membered ring predominate. Due to open chain structure they have cavities and can take up water and other small molecules.
11. THE P-BLOCK ELEMENTS
189731
Which of the following cuts ultraviolet rays
1 Soda glass
2 Crooke's glass
3 Pyrax
4 None of these
Explanation:
(b) Crook's glass is a special type of glass containing cerium oxide. It does not allow the passage of ultra violet ray and is used for making lenses.
11. THE P-BLOCK ELEMENTS
189732
In \(IIIA\) group, \(Tl\) (thalium) shows \(+1\) oxidation state while other members show \(+3\) oxidation state. Why
1 Presence of lone pair of electron in \(Tl\)
2 Inert pair effect
3 Large ionic radius of \(Tl\) ion
4 None of these
Explanation:
(b) Inert pair effect become significant for the \(6^{th}\) and \(7^{th}\) period of \(p\) -block element.
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11. THE P-BLOCK ELEMENTS
189729
Solid \(C{O_2}\) is known as dry ice, because
1 It melts at \(0\,^°C\)
2 It evaporates at \(40\,^°C\)
3 It evaporates at \( - 78\,^\circ C\) without melting
4 Its boiling point is more than \(199\,^°C\)
Explanation:
(c) Solid \(C{O_2}\) is knows as dry ice because it evaporates at \(-78\,^°C\) without changing in the liquid state.
11. THE P-BLOCK ELEMENTS
189730
Which one of the following statements about the zeolites is false
1 Zeolites are aluminosilicates having three dimensional network
2 Some of the \(SiO_4^{ - 4}\) units are replaced by \(AlO_4^{ - 5}\) and \(AlO_6^{9 - }\) ions in zeolites
3 They are used as cation exchangers
4 They have open structure which enables them to take up small molecules
Explanation:
(b) Zeolite have \(Si{O_4}\) and \(Al{O_4}\) tetrahedrons linked together in a three dimensional open structure in which four or six membered ring predominate. Due to open chain structure they have cavities and can take up water and other small molecules.
11. THE P-BLOCK ELEMENTS
189731
Which of the following cuts ultraviolet rays
1 Soda glass
2 Crooke's glass
3 Pyrax
4 None of these
Explanation:
(b) Crook's glass is a special type of glass containing cerium oxide. It does not allow the passage of ultra violet ray and is used for making lenses.
11. THE P-BLOCK ELEMENTS
189732
In \(IIIA\) group, \(Tl\) (thalium) shows \(+1\) oxidation state while other members show \(+3\) oxidation state. Why
1 Presence of lone pair of electron in \(Tl\)
2 Inert pair effect
3 Large ionic radius of \(Tl\) ion
4 None of these
Explanation:
(b) Inert pair effect become significant for the \(6^{th}\) and \(7^{th}\) period of \(p\) -block element.
189729
Solid \(C{O_2}\) is known as dry ice, because
1 It melts at \(0\,^°C\)
2 It evaporates at \(40\,^°C\)
3 It evaporates at \( - 78\,^\circ C\) without melting
4 Its boiling point is more than \(199\,^°C\)
Explanation:
(c) Solid \(C{O_2}\) is knows as dry ice because it evaporates at \(-78\,^°C\) without changing in the liquid state.
11. THE P-BLOCK ELEMENTS
189730
Which one of the following statements about the zeolites is false
1 Zeolites are aluminosilicates having three dimensional network
2 Some of the \(SiO_4^{ - 4}\) units are replaced by \(AlO_4^{ - 5}\) and \(AlO_6^{9 - }\) ions in zeolites
3 They are used as cation exchangers
4 They have open structure which enables them to take up small molecules
Explanation:
(b) Zeolite have \(Si{O_4}\) and \(Al{O_4}\) tetrahedrons linked together in a three dimensional open structure in which four or six membered ring predominate. Due to open chain structure they have cavities and can take up water and other small molecules.
11. THE P-BLOCK ELEMENTS
189731
Which of the following cuts ultraviolet rays
1 Soda glass
2 Crooke's glass
3 Pyrax
4 None of these
Explanation:
(b) Crook's glass is a special type of glass containing cerium oxide. It does not allow the passage of ultra violet ray and is used for making lenses.
11. THE P-BLOCK ELEMENTS
189732
In \(IIIA\) group, \(Tl\) (thalium) shows \(+1\) oxidation state while other members show \(+3\) oxidation state. Why
1 Presence of lone pair of electron in \(Tl\)
2 Inert pair effect
3 Large ionic radius of \(Tl\) ion
4 None of these
Explanation:
(b) Inert pair effect become significant for the \(6^{th}\) and \(7^{th}\) period of \(p\) -block element.
189729
Solid \(C{O_2}\) is known as dry ice, because
1 It melts at \(0\,^°C\)
2 It evaporates at \(40\,^°C\)
3 It evaporates at \( - 78\,^\circ C\) without melting
4 Its boiling point is more than \(199\,^°C\)
Explanation:
(c) Solid \(C{O_2}\) is knows as dry ice because it evaporates at \(-78\,^°C\) without changing in the liquid state.
11. THE P-BLOCK ELEMENTS
189730
Which one of the following statements about the zeolites is false
1 Zeolites are aluminosilicates having three dimensional network
2 Some of the \(SiO_4^{ - 4}\) units are replaced by \(AlO_4^{ - 5}\) and \(AlO_6^{9 - }\) ions in zeolites
3 They are used as cation exchangers
4 They have open structure which enables them to take up small molecules
Explanation:
(b) Zeolite have \(Si{O_4}\) and \(Al{O_4}\) tetrahedrons linked together in a three dimensional open structure in which four or six membered ring predominate. Due to open chain structure they have cavities and can take up water and other small molecules.
11. THE P-BLOCK ELEMENTS
189731
Which of the following cuts ultraviolet rays
1 Soda glass
2 Crooke's glass
3 Pyrax
4 None of these
Explanation:
(b) Crook's glass is a special type of glass containing cerium oxide. It does not allow the passage of ultra violet ray and is used for making lenses.
11. THE P-BLOCK ELEMENTS
189732
In \(IIIA\) group, \(Tl\) (thalium) shows \(+1\) oxidation state while other members show \(+3\) oxidation state. Why
1 Presence of lone pair of electron in \(Tl\)
2 Inert pair effect
3 Large ionic radius of \(Tl\) ion
4 None of these
Explanation:
(b) Inert pair effect become significant for the \(6^{th}\) and \(7^{th}\) period of \(p\) -block element.