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Class 11

Chemistry

Solution for Class 11, Chemistry

Question 1

How many

mL

0.1 M HCl

are required to react completely with

1 g

mixture of

Na_{2} CO_{3}

and

NaHCO_{3}

containing equimolar amounts of both?

Topic:

Solid State

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Question 2

Identify if the following molecule is an

E

Z

isomerism.

Topic:

General Organic Chemistry

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Question 3

molality

= \frac{moles \times 1000}{W ( g ) of solvent}

- It does not change on changing temperature. Example 2: If

20 ml

0.5 M Na_{2} SO_{4}

is mixed with

50 ml

0.2 MH_{2} SO_{4} &30 ml

0.4 MAl_{2} (SO_{4})_{3}

solution. Calculate

[Na^{+}]

[H^{+}], [SO_{4}^{2 -}], [Al^{3 +}]

. [Assuming

100%

dissociation]

Topic:

Gases & Solutions

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Question 4

O) Calculate the mole fraction of benzene in solution containing

30%

by mass in carbon tetrachloride.

Topic:

Mole Concept & Redox

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Question 5

Which of the following is the strongest acid?

Topic:

General Organic Chemistry

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Question 6

Number of visible lines observed when an electron jumps back from

5^{th}

orbit to ground stat spectrum is/are

Topic:

General Organic Chemistry

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Question 7

A welding fuel gas contains carbon and hydrogen only. Burning a small sample of it in oxygen gives

3.38 g

carbon dioxide

.690 g

of water and no other products. A volume of

10.0 L

of this welding gas is found to weigh

11.6 g

the empirical \& molecular formula will be.

(म) $CH, C_{2} H_{2}$
(2) $CH, CH$
(3) $CH, C_{3} H_{8}$
(4) None of these

Topic:

Mole Concept & Redox

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Question 8

85. Calculate the no. of atoms present in

2.4 \pm 0

ozone. —

(1) $N_{A} /20$
(2) $\frac{3}{20}$
A (3) $N_{A} /4$
$(4) 31$

Topic:

Mole Concept & Redox

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Question 9

The total number of

g m

-molecules of

SO_{2} Cl_{2}

13.5 g

$0.1$
$0.2$
$O .3$
$0.4$

Topic:

General Organic Chemistry

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Question 10

The largest number of molecules is in

$34 g$ of water
$28 g$ of $CO_{2}$
$46 g$ of $CH_{3} OH$
$54 g$ of $N_{2} O_{5}$

Topic:

General Organic Chemistry

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Question 11

Which of the following has maximum number of atoms?

$18 g$ of $H_{2} O$
$16 g$ of $O_{2}$
$4.4 g$ of $CO_{2}$
$16 g$ of $CH_{4}$

Topic:

Mole Concept & Redox

View 14 solutions

Question 12

The number of sulphur atoms present in

0.2

moles of

S_{8}

molecules is

$4.82 \times 1 0^{23}$
$9.63 \times 1 0^{22}$
$963 \times 1 0^{23}$
$1.20 \times 1 0^{23}$

Topic:

Mole Concept & Redox

View 3 solutions

Question 13

ug NaOH is dissolved in

396 g H_{2} O

. mass

%

NaOH

X_{NaOl}

Topic:

Mole Concept & Redox

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Question 14

find the

%

calw) fraction of insulin in the solution. prepared by dissolving

5.65 g

of insulin and

34.35 g

of water? what is the mole fraction at ethonol

(C_{2} 1 + 50 H)

20% (ω / ω)

soln? The molality af sulphric acid (

H_{2} SO_{4})

soln

Topic:

Mole Concept & Redox

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Question 15

3.0 g

of carbon 31) One c.c. of oxygen at BTP contains:

$0.5373 \times 1 0^{20}$ atoms

Topic:

General Organic Chemistry

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Question 16

Intext Questions

2.6 H_{2} S

, a toxic gas with rotten egg like smell, is used for the qualitative analysis. If the solubility of

H_{2} S

in water at STP is

0.195 m

, calculate Henry's law constant.

2.7

Henry's law constant for

CO_{2}

in water is

1.67 \times 1 0^{8} Pa

298 K

. Calculate the quantity of

CO_{2}

500 mL

of soda water when packed under

2.5 atm

CO_{2}

pressure at

298 K

Topic:

Coordination Compounds

View 2 solutions

Question 17

In which of the following compounds, the oxidation number of iodine is fractional ?

IF
$I_{3}$
$LF_{5}$
IF

Topic:

General Organic Chemistry

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Question 18

The oxidation number of cobalt in

K_{3} [Co (NO_{2})

]

0
$+ 4$

Topic:

General Organic Chemistry

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Question 19

(3) + 3

(4) + 6

7. Phosphorus has the oxidation state of

+ 3

Phosphorous acid
Hypophosphorous acid
Orthophosphoric acid
Metaphosphoric acid

Topic:

General Organic Chemistry

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Question 20

The oxidation number of Phosphorus in

Mg_{2} P_{2} O_{7}

is :

(1) + 3

$+ 2$

Topic:

General Organic Chemistry

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Solution for Class 11, Chemistry

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