The most abundant elements by mass in the body of a healthy human adult are : Oxygen (61.4%); Carbon (22.9%), Hydrogen (10.0%); and Nitrogen (2.6%). The weight (in kg) which a 75 kg person would gain if all atoms are replaced by
atoms is :
Option: 1 7.5
Option: 2 10
Option: 3 15
Option: 4 37.5
Given that
Mass of the person = 75 kg
Mass of 1H1 present in person = 10% of 75 kg = 7.5 kg
Since Mass of 1H2 is double the Mass of 1H1
So, Mass of 1H2 will be in person = 2 X 7.5 kg =15 kg
Thus, increase in weight = 15 - 7.5 = 7.5 kg
Therefore, Option (1) is correct
View Full Answer(1)The correct order of the atomic radii of C, Cs, Al and S is :
Option: 1
Option: 2
Option: 3
Option: 4
Periodicity of atomic radius and ionic radius in period -
In a period from left to right the effective nuclear charge increases because the next electron fills in the same shell. So the atomic size decrease.
- wherein
Electronegativity and atomic radius -
The attraction between the outer electrons and the nucleus increases as the atomic radius decreases in a period.
- wherein
Size of atom and ion in a group -
In a group moving from top to the bottom the number of shell increases.So the atomic size increases.
- wherein
As we know that
From Left to right in a period size decreases and when going down the group size increases
Therefore, Option(2) is correct
View Full Answer(1)
The IUPAC symbol for the element with atomic number 119 would be:
Option: 1 uue
Option: 2une
Option: 3 unh
Option: 4 uun
Nomenclature of elements with atomic number >100 -
The name is derived directly from the atomic number of the element using the following numerical roots:
0 = nil
1 = un
2 = bi
3 = tri
4 = quad
5 = pent
6 = hex
7 = sept
8 = oct
9 = enn
Eg:
Atomic number |
Name |
Symbol |
101 |
Mendelevium (Unnilunium) |
Md (Unu) |
102 |
Nobelium (Unnilbium) |
No (Unb) |
-
uue
1 1 9
Un Un ennium
Therefore, Option(1) is correct.
View Full Answer(1)The ammonia released on quantitative reaction of 0.6g, urea
with sodium hydroxide
can be neutralised by:
Option: 1 200 ml of 0.2 N HCl
Option: 2200 ml of 0.4 N HCl
Option: 3100 ml of 0.1N HCl
Option: 4100 ml of 0.2N HCl
2 × mole of Urea = mole of ........(1)
mole of = mole of
........(2)
mole of HCl = 2 × mole of Urea
mole of HCl = ...(i)
[We know , mole = M X V = N X n X V]
...as (i).
Therefore, Option(4) is correct.
View Full Answer(1)
Given,
The average molar mass of chlorine is
Let , the ratio of in naturally occurring chlorine is close to x : y
Now, we know
So,
Therefore, the correct option is (2).
View Full Answer(1)
The minimum number of moles of O2 required for complete combustion of 1 mole of propane and 2 moles of butane is ______
Combustion reaction of 1 mole of propane and 2 moles of butane-
So, Total required mol of O2 = 5 + 13 = 18.
Ans = 18
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Non-adrenaline is a neurotransmitter. If nor-adrenaline is low, a person may suffer from depression. Hence, an antidepressant drug is suggested.
Anti-depressant → drug, which enhances the mood.
Therefore, the correct option is (2).
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Brompheniramine works by blocking the action of histamine, which causes allergic symptoms.
Hence, it acts as an antihistamine.
Therefore, Option(3) is correct.
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Given,
2.8 kg of dinitrogen quantitatively reacts with 1 kg of dihydrogen.
From above, the mole of ammonia = 0.2 kMol
So, mass of ammonia = mole X molar mass
mass of ammonia = 0.2 (kMol ) X 17 (g/Mol)
mass of ammonia = 3.4 kg = 3400 g
Ans = 3400
View Full Answer(1)A 100mL solution was made by adding 1.43g of . The normality of the solution is 0.1N. The value of x is___________. (The atomic mass of Na is 23 g/mol)
Molar mass(M) of Na2CO3.xH2O
M = 23 × 2 + 12 + 48 + 18x
M = 46 + 12 + 48 + 18x
M = (106 + 18x)
As nfactor in dissolution will be determined from net cationic or anionic charge; which is 2 so.
Eq.wt. = = (53 + 9x)
As volume = 100 ml = 0.1 Litre
53 + 9x = 143
9x = 90
x = 10.00
Ans = 10
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