CHEMISTRY THE P-BLOCK ELEMENTS-11th
QUIZ-15
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.This salt of oxoacids of phosphorus is used as washing detergent
Solution
Calgon
SHMP (calgon) products are used for water softning and detergents.
Calgon
SHMP (calgon) products are used for water softning and detergents.
Q2.Alums are used as mordant in dyeing because
Solution
Dye is adsorbed on Al(OH)3 which is deposited on fibre in the hydrolysis process
Dye is adsorbed on Al(OH)3 which is deposited on fibre in the hydrolysis process
Q3.Out of CO2, SiO2, GeO, SnO2 and PbO2
Solution
Both (a) and (b) are correct
Both (a) and (b) are correct
Q4.Of the following acids
I: hypo phosphorous acid
II: hydrofluoric acid
III: oxalic acid
IV: glycine
Solution
Q5.Which of the following has the highest first ionization energy?
Solution
The first ionization energy is the energy required to remove one mole of the most loosely held electron from one mole of gaseous atom to produce one mole gaseous ion each with a charge of +1.
As we move across the period, the first ionization energy increases. This is due to the fact that the atomic radius decreases i.e. the atom is small in size. Further, the outer electrons are closer to the nucleus and are more strongly attracted to the center. Therefore, the order of ionization energies is given below:
Li < Be < B < C
Therefore, on moving from left to right, the ionization energy increases as effective nuclear charge increases and the size decreases and hence, the removal of electrons becomes more and more difficult. So, carbon has the highest first ionization energy.
The first ionization energy is the energy required to remove one mole of the most loosely held electron from one mole of gaseous atom to produce one mole gaseous ion each with a charge of +1.
As we move across the period, the first ionization energy increases. This is due to the fact that the atomic radius decreases i.e. the atom is small in size. Further, the outer electrons are closer to the nucleus and are more strongly attracted to the center. Therefore, the order of ionization energies is given below:
Li < Be < B < C
Therefore, on moving from left to right, the ionization energy increases as effective nuclear charge increases and the size decreases and hence, the removal of electrons becomes more and more difficult. So, carbon has the highest first ionization energy.
Q6.Essential constituents of plants and animal tissues are
Solution
N and P
Nitrogen (N), phosphorus (P) and potassium (K) are present in plant tissue in quantities from 0.2% to 4.0% (on a dry matter weight basis).
N and P
Nitrogen (N), phosphorus (P) and potassium (K) are present in plant tissue in quantities from 0.2% to 4.0% (on a dry matter weight basis).
Q7.H3BO3 and HBO2 do not differ in
Solution
ON
H3PO3 +3
HBO2 +3
ON
H3PO3 +3
HBO2 +3
Q8.Percentage of lead in lead pencil is
Solution
Graphite is present in lead pencils
Graphite is present in lead pencils
Q9.Holme’s signals can be given by using
Solution
Holme’s signals are used to guide the ships. Containers with holes and filled with CaC2 and Ca3P2 are thrown into sea water. Water reacts with CaC2 forming C2H2 and Ca3P2 forming PH3
CaC2 + 2H2O → CaOH2 + CH≡CH
Ca3P2 + 6H2O → 3CaOH2+ 2PH3
PH3 further reacts with H2O and burns with flame which further ignites C2H2 and flame in the form of torch is helpful in guiding the ways to missing ships
Holme’s signals are used to guide the ships. Containers with holes and filled with CaC2 and Ca3P2 are thrown into sea water. Water reacts with CaC2 forming C2H2 and Ca3P2 forming PH3
CaC2 + 2H2O → CaOH2 + CH≡CH
Ca3P2 + 6H2O → 3CaOH2+ 2PH3
PH3 further reacts with H2O and burns with flame which further ignites C2H2 and flame in the form of torch is helpful in guiding the ways to missing ships
Q10. Arsenic drugs are mainly used for the treatment of
Solution
Syphilis
Syphilis
