In the reaction: 2 Al s + 6 HCl aqueous → 2 Al 3 + aqueous + 6 Cl - aqueous + 3 H 2 g

11 . 2 L H 2 g at STP is produced for every mole of HCl aqueous consumed.

6 L HCl aqueous is consumed for every 3 L H 2 g produced.

33 . 6 L H 2 g is produced, regardless of temperature and pressure for every mole of Al that reacts.

67 . 2 L H 2 g at STP is produced for every mole of Al that reacts.

If one mole of H 3 PO 4 reacts with 1 mole of X OH 2 as H 3 PO 4 + X ( OH ) 2 → XHPO 4 + 2 H 2 O , then,

The resulting solution will require 1 mole NaOH for complete neutralization.

Equivalent weight of base is molecular weight 3 .

Equivalent weight of H 3 PO 4 is 98 3 .

1 more mole of X OH 2 is required for the complete neutralization of XHPO 4 .

E M B I B E

Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 2>Q 20

MEDIUM

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IMPORTANT

Earn 100

Which of the following has the highest mass?

51.67% studentsanswered this correctly

Important Questions on Some Basic Concepts of Chemistry

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IMPORTANT

Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 2>Q 21

22.4

litres

of water vapour at

NTP

, when condensed to water, occupies an approximate volume of:

EASY

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IMPORTANT

Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 2>Q 22

A gaseous oxide contains

30.4 %

of nitrogen, one molecule of which contains one nitrogen atom. The density of the oxide relative to oxygen is

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IMPORTANT

Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 2>Q 23

In the reaction:

$2 Al (s) + 6 HCl (aqueous) \overset{}{\to} 2 {Al}^{3 +} (aqueous) + 6 {Cl}^{-} (aqueous) + 3 H_{2} (g)$

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IMPORTANT

Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 2>Q 24

A compound of $Xe$ and $F$ is found to have $53.3 % Xe$ . The oxidation number of $Xe$ in this compound is

$(Xe = 131.3 g {mol}^{- 1}, F = 19 g {mol}^{- 1})$

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IMPORTANT

Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 2>Q 25

If one mole of

H_{3} {PO}_{4}

reacts with

1

mole of

X {(OH)}_{2}

as

H_{3} {PO}_{4} + X (OH)_{2} \to {XHPO}_{4} + 2 H_{2} O

, then,

HARD

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IMPORTANT

Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 2>Q 26

A nugget of gold and quartz weigh $100 g$ specific gravity of gold, quartz and the nugget are $19.3, 2.6$ and $6.4$ , respectively. Calculate the weight of gold in the nugget.

Hint:

\frac{x}{19.3} + \frac{100 - x}{2.6} = \frac{100}{6.4}

;

x =

Weight of gold (in grams)

HARD

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IMPORTANT

Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 2>Q 27

A sample of potato starch was ground in a ball mill to give a starch-like molecule of lower molecular weight. The product analysed $0.086 %$ Phosphorus. If each molecule is assumed to contain one atom of phosphorus, what is the molecular weight of the material?

The molecular weight of the material is $z \times 10^{3} g$ , find $z$ (Nearest integer).

HARD

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 23 - Some Basic Concepts of Chemistry>Level 2>Q 28

The reaction