CHEMISTRY THE P-BLOCK ELEMENTS-11th
QUIZ-10
Dear Readers,
IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies.
Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..
Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..
Q1.Orthoboric acid H3BO3 behaves as weak monobasic acid giving H3O+ and
Solution
B(OH)3 + 2H2O → [B(OH)4]- + H3O+
B(OH)3 + 2H2O → [B(OH)4]- + H3O+
Q2.Soda free glass fibre are made of
Solution
H3BO3, B2O3 and Ca3(BO3)2
H3BO3, B2O3 and Ca3(BO3)2
Q3.Select the correct statement(s) about H3BO3
Solution
Both (a) and (b) are correct
Both (a) and (b) are correct
Q4.Which gas is used in aerated water?
Solution
CO2 + H2O ⇌ H2CO3
CO2 + H2O ⇌ H2CO3
Q5.Red and white phosphorus will differ but not in
Solution
Reactions with HNO3
Reactions with HNO3
Q6.Which of the following have the highest melting points?
Solution
d− block elements have highest melting points as they can form covalent bonds due to incompletely filled d orbitals.
They melt above 1000oC
d− block elements have highest melting points as they can form covalent bonds due to incompletely filled d orbitals.
They melt above 1000oC
Q7.Green house effect is due to
Solution
absorption of heat radiation by atmospheric gases particularly water vapours.
The greenhouse effect is a natural process that warms the earth's surface. When the Sun's
energy reaches the earth's atmosphere, some of it is reflected back to space and the rest is
absorbed and re-radiated by greenhouse gases.
Greenhouse gases include water vapour, carbon dioxide, methane, nitrous oxide, ozone and
some artificial chemicals such as chlorofluorocarbons (CFCs)
absorption of heat radiation by atmospheric gases particularly water vapours.
The greenhouse effect is a natural process that warms the earth's surface. When the Sun's
energy reaches the earth's atmosphere, some of it is reflected back to space and the rest is
absorbed and re-radiated by greenhouse gases.
Greenhouse gases include water vapour, carbon dioxide, methane, nitrous oxide, ozone and
some artificial chemicals such as chlorofluorocarbons (CFCs)
Q8.In B2H6
Solution
Two hydrogens atoms act as bridged hydrogen atoms and involved in the formation of three centre-two electrons bonds.
Two hydrogens atoms act as bridged hydrogen atoms and involved in the formation of three centre-two electrons bonds.
Q9.Borax is converted into B by steps
Borax I → H3BO3 ∆ → B2O3 II → B
I and II reagents are
Solution
Borax H+ → H3BO3 ∆ → B2O3 Mg → B
Borax H+ → H3BO3 ∆ → B2O3 Mg → B
Q10. Ambidentate ligands are
Solution
All of these
All of these
