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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

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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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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

Crack NEET with "AI Coach"

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)