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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 which a $75 kg$ person would gain if all ${}^{1}H$ atoms are replaced by ${}^{2}H$ atoms is:

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Important Questions on Some Basic Concepts of Chemistry

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-3>Q 20

Three moles of

B_{2} H_{6}

are completely reacted with methanol. The number of moles of boron containing product formed is

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-3>Q 21

6.02 \times 10^{20}

molecules of urea are present in

100 mL

of its solution. The concentration of urea solution is

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-3>Q 22

Silver (atomic weight =

108 g {mol}^{- 1}

) has a density of

10.5 g {cm}^{- 3}

. The number of silver atoms on a surface of area

10^{- 12} m^{2}

can be expressed in scientific notation as

y \times 10^{x}

. The value of x is

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-3>Q 23

For the reaction :

I^{-} + {CIO}_{3}^{-} + H_{2} {SO}_{4} ⟶ {Cl}^{-} + {HSO}_{4}^{-} + I_{2}

The correct statement(s) in the balanced equation is/are :

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-3>Q 25

For per gram of reactant, the maximum quantity of

N_{2}

gas is produced in which of the following thermal decomposition reactions?

(Given: Atomic wt.

- C r = 52 u, B a = 137 u

)

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-3>Q 26

The ammonia prepared by treating ammonium sulphate with calcium hydroxide is completely used by ${NiCl}_{2} \cdot 6 H_{2} O$ to form a stable coordination compound. Assume that both the reactions are $100 %$ complete. If $1584 g$ of ammonium sulphate and $952 g$ of ${NiCl}_{2} \cdot 6 H_{2} O$ are used in the preparation, the combined weight (in grams) of gypsum and the nickel-ammonia coordination compound thus produced is _____

(Atomic weights in $g {mol}^{- 1} : H = 1, N = 14, O = 16, S = 32, Cl = 35.5, Ca = 40, Ni = 59$ )

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-4>Q 1

Mass of a typical star is

1.0 \times 10^{30} kg

. Assume that a star is typically

3 / 4

hydrogen and

1 / 4

helium by mass. The estimated number of protons (which are present in

H

as well as

He

) in a typical star is approximately.

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Alpha Question Bank for Engineering: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>Exercise-4>Q 2

10 L

O_{2} gas

is reacted with

30 L

CO (g)

STP .

The volume of each gas present at the end of the reaction are:

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 which a 75 kg person would gain if all H1 atoms are replaced by H2 atoms is:

Important Questions on Some Basic Concepts of Chemistry

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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 which a $75 kg$ person would gain if all ${}^{1}H$ atoms are replaced by ${}^{2}H$ atoms is: