25 g of an unknown hydrocarbon upon burning produces 88 g of C O 2 and 9 g of H 2 O . This unknown hydrocarbon contains:

24 g of carbon and 1 g of hydrogen

18 g of carbon annd 7 g of hydrogen

22 g of carbon and 3 g of hydrogen

20 g carbon and 5 g of hydrogen

5 moles of A B 2 weigh 125 × 10 - 3 k g and 10 moles of A 2 B 2 weigh 300 × 10 - 3 k g . The molar mass of A ( M A ) and molar mass of B ( M B ) in k g m o l - 1 are:

M A = 5 × 10 - 3 and M B = 10 × 10 - 3

M A = 25 × 10 - 3 and M B = 50 × 10 - 3

M A = 50 × 10 - 3 and M B = 25 × 10 - 3

M A = 10 × 10 - 3 and M B = 5 × 10 - 3

EASY

JEE Main

IMPORTANT

Earn 100

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 $= 80$ ]

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 - 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_______

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 16th April 2018>Q 64

An unknown chlorohydrocarbon has 3.55 % of chlorine. If each molecule of the hydrocarbon has one chlorine atom only; chlorine atoms present in 1 g of chlorohydrocarbon are :(Atomic wt. of

Cl = 35 .5 u;

Avogadro constant

= 6 .023 \times 10^{23} {mol}^{- 1}

)

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 15th April 2018>Q 65

A sample of

{NaClO}_{3}

is converted by heat to

NaCl

with a loss of

0.16 g

of oxygen. The residue is dissolved in water and precipitated as

AgCl

. The mass of

AgCl

(in

g

) obtained will be: (Given: Molar mass of

AgCl = 143 .5 g {mol}^{- 1}

)

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 12th January 2019 Shift 2>Q 66

8 g

NaOH

is dissolved in

18 g

H_{2} O

. Mole fraction of

NaOH

in solution and molality (in

mol {kg}^{- 1}

) of the solution respectively are:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 12th April 2019 Shift 2>Q 67

25 g

of an unknown hydrocarbon upon burning produces

88 g

C O_{2}

and

9 g

H_{2} O .

This unknown hydrocarbon contains:

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 12th April 2019 Shift 1>Q 68

The mole fraction of a solvent in aqueous solution of a solute is

0.8 .

The molality (in mol

{k g}^{- 1}

) of the aqueous solution is:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>JEE Main - 12th April 2019 Shift 1>Q 69

5

moles of

A B_{2}

weigh

125 \times 10^{- 3} k g

and

10

moles of

A_{2} B_{2}

weigh

300 \times 10^{- 3} k g

. The molar mass of A

(M_{A})

and molar mass of

B (M_{B})

k g {m o l}^{- 1}

are:

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]

Important Questions on Some Basic Concepts of Chemistry

Learn and Prepare for any exam you want !

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 $= 80$ ]