EASY

JEE Main

IMPORTANT

Earn 100

The number of significant figures in $0.00340$ is _________

50% studentsanswered this correctly

Important Questions on Some Basic Concepts of Chemistry

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 25 July 2021 Shift 1>Q 56

Consider the complete combustion of butane, the amount of butane utilized to produce

72.0 g

of water is ______

\times 10^{- 1} g

. (in nearest integer)

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 25 Feb 2021 Shift 2>Q 57

Consider titration of

NaOH

solution versus

1.25 M

oxalic acid solution. At the end point following burette readings were obtained.
(i)

4.5 mL

(ii)

4.5 mL

(iii)

4.4 mL

(iv)

4.4 mL

(v)

4.4 mL

If the volume of oxalic acid taken was

10.0 mL

then the molarity of the

NaOH

solution is ___

M

. (Rounded-off to the nearest integer)

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 24 Feb 2021 Shift 2>Q 58

1.86 g

of aniline completely reacts to form acetanilide.

10 %

of the product is lost during purification. Amount of acetanilide obtained after purification (in

g

) is ___________

\times 10^{- 2} .

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 22 July 2021 Shift 1>Q 59

Methylation of

10 g

of benzene gave

9.2 g

of toluene. Calculate the percentage yield of toluene (Nearest integer)

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 20 July 2021 Shift 2>Q 60

4 g

equimolar mixture of

NaOH

and

{Na}_{2} {CO}_{3}

contains

xg

NaOH

and

yg

{Na}_{2} {CO}_{3} .

The value of

x

g .

(Nearest integer)

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 20 July 2021 Shift 2>Q 61

When $0.15 g$ of an organic compound was analyzed using Carius method for estimation of bromine, $0.2397 g$ of $AgBr$ was obtained. The percentage of bromine in the organic compound is _________.(Nearest integer)

[Atomic mass : Silver $= 108,$ Bromine $= 80$ ]

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 20 July 2021 Shift 1>Q 62

250 mL

0.5 M NaOH

was added to

500 mL

1 M

HCl

. The number of unreacted

HCl

molecules in the solution after the complete reaction is p

\times 10^{21}

. Find out p
(Nearest integer)

(N_{A} = 6.022 \times 10^{23})

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 2 September 2020 Shift 2>Q 63

The ratio of the mass percentages of '

C

H

' and '

C

O

' of a saturated acyclic organic compound '

X

' are

4 : 1

and

3 : 4

respectively. Then, the moles of oxygen gas required for complete combustion of two moles of organic compound '

X

' is_______

The number of significant figures in 0.00340 is _________

Important Questions on Some Basic Concepts of Chemistry

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The number of significant figures in $0.00340$ is _________