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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 $^{1}H$ atoms are replaced by $^{2}H$ 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

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Posted by

vishal kumar

The correct order of the atomic radii of C, Cs, Al and S is :
Option: 1 $S<C<Cs<Al$
Option: 2 $C<S<Al<Cs$
Option: 3 $C<S<Cs<Al$
Option: 4 $S<C<Al<Cs$

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

$Li>Be>B>C>N>O>F$

Electronegativity and atomic radius -

The attraction between the outer electrons and the nucleus increases as the atomic radius decreases in a period.

- wherein

$Electronegativity\propto\frac{1}{atomic\:radius}$

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

$Li<Na<K<Rb<Cs$

As we know that

From Left to right in a period size decreases and when going down the group size increases

$C< S< Al< Cs$

Therefore, Option(2) is correct

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Posted by

Ritika Jonwal

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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.

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Posted by

Ritika Jonwal

The ammonia $(NH_{3})$ released on quantitative reaction of 0.6g, urea $(NH_{2}CONH_{2})$ with sodium hydroxide $(NaOH)$ 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 $NH_{3}$ ........(1)
mole of $NH_{3}$ = mole of $HCl$ ........(2)
$\therefore$ mole of HCl = 2 × mole of Urea

mole of HCl = $2\times \frac{0.6}{60}=0.02mol$ ...(i)

[We know , mole = M X V = N X n X V]

$\mathrm{100 \ ml\times 0.2N\times 1=0.02\ mol}$ ...as (i).

Therefore, Option(4) is correct.

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Posted by

Ritika Jonwal

JEE Main high-scoring chapters and topics

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The average molar mass of chlorine is $35.5\: g\: mol^{-1}.$ The ratio of $^{35}Cl\; to\; ^{37}Cl$ in naturally occurring chlorine is close to :
Option: 1 4:1
Option: 2 3:1
Option: 3 2:1
Option: 4 1:1

Given,

The average molar mass of chlorine is $35.5\: g\: mol^{-1}.$

Let , the ratio of $^{35}Cl\; to\; ^{37}Cl$ in naturally occurring chlorine is close to x : y

Now, we know

$\text { Av. molar mass }=\frac{\mathrm{n}_{1} \mathrm{M}_{1}+\mathrm{n}_{2} \mathrm{M}_{2}}{\left(\mathrm{n}_{1}+\mathrm{n}_{2}\right)}$

So,

$35.5=\frac{x \times 35+y \times 37}{x+y}$

$1.5 y=-0.5 x$

$\frac{x}{y}=\frac{3}{1}$

Therefore, the correct option is (2).

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Posted by

Kuldeep Maurya

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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Posted by

Kuldeep Maurya

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If a person is suffering from the deficiency if nor-adrenaline, what kind of drug can be suggested ?
Option: 1 Anti-inflammatory
Option: 2 Antidepressant
Option: 3 Antihistamine
Option: 4 Analgesic

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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Posted by

Kuldeep Maurya

The following molecules act as an :
Option: 1 Antidepranant
Option: 2 Anti-bacterial
Option: 3 Antiseptic
Option: 4 Anti-histamine

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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Posted by

Kuldeep Maurya

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The mass of ammonia in grams produced when 2.8 kg of dinitrogen quantitatively reacts with 1 kg of dihydrogen is_________
Option: 1 3400
Option: 2 -
Option: 3 -
Option: 4 -

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

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Posted by

Kuldeep Maurya

A 100mL solution was made by adding 1.43g of $\mathrm{Na_{2}CO_{3}.xH_{2}O}$ . 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 n_factor in dissolution will be determined from net cationic or anionic charge; which is 2 so.

Eq.wt. = $\mathrm{\frac{M}{2}}$ = (53 + 9x)

$\text { Gm}_\textup{eq }=\frac{\textup{wt}}{\text { Eq.wt. }}=\frac{1.43}{53+9 x}$

$\text { Normality }=\frac{\text { Gm}_\textup{eq} }{\mathrm{V}_{\text {litre }}}$

As volume = 100 ml = 0.1 Litre

$\text { Normality }=0.1=\frac{\frac{1.43}{53+9 \mathrm{x}}}{0.1}$

$10^{-2}=\frac{1.43}{53+9 x}$

53 + 9x = 143
9x = 90
x = 10.00

Ans = 10

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Posted by

Kuldeep Maurya

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Get Answers to all your Questions

All Questions

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

Posted by

vishal kumar

The correct order of the atomic radii of C, Cs, Al and S is : Option: 1 Option: 2 Option: 3 Option: 4

Posted by

Ritika Jonwal

Crack CUET with india's "Best Teachers"

The IUPAC symbol for the element with atomic number 119 would be: Option: 1 uue Option: 2une Option: 3 unh Option: 4 uun

Posted by

Ritika Jonwal

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

Posted by

Ritika Jonwal

JEE Main high-scoring chapters and topics

The average molar mass of chlorine is The ratio of in naturally occurring chlorine is close to : Option: 1 4:1Option: 2 3:1Option: 3 2:1Option: 4 1:1

The correct order of the atomic radii of C, Cs, Al and S is :
Option: 1 $S<C<Cs<Al$
Option: 2 $C<S<Al<Cs$
Option: 3 $C<S<Cs<Al$
Option: 4 $S<C<Al<Cs$

The IUPAC symbol for the element with atomic number 119 would be:
Option: 1 uue
Option: 2une
Option: 3 unh
Option: 4 uun

The ammonia $(NH_{3})$ released on quantitative reaction of 0.6g, urea $(NH_{2}CONH_{2})$ with sodium hydroxide $(NaOH)$ 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

The average molar mass of chlorine is $35.5\: g\: mol^{-1}.$ The ratio of $^{35}Cl\; to\; ^{37}Cl$ in naturally occurring chlorine is close to :
Option: 1 4:1
Option: 2 3:1
Option: 3 2:1
Option: 4 1:1

The minimum number of moles of O₂ required for complete combustion of 1 mole of propane and 2 moles of butane is ______

If a person is suffering from the deficiency if nor-adrenaline, what kind of drug can be suggested ?
Option: 1 Anti-inflammatory
Option: 2 Antidepressant
Option: 3 Antihistamine
Option: 4 Analgesic

The following molecules act as an :
Option: 1 Antidepranant
Option: 2 Anti-bacterial
Option: 3 Antiseptic
Option: 4 Anti-histamine

The mass of ammonia in grams produced when 2.8 kg of dinitrogen quantitatively reacts with 1 kg of dihydrogen is_________
Option: 1 3400
Option: 2 -
Option: 3 -
Option: 4 -

A 100mL solution was made by adding 1.43g of $\mathrm{Na_{2}CO_{3}.xH_{2}O}$ . The normality of the solution is 0.1N. The value of x is___________. (The atomic mass of Na is 23 g/mol)