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Question 18121

PTS OF CHEMOTH G 'T concep ce of mat 9.1.1 Arrangem De term matu thing which s called matt example, book, p ang beings, etc. u know that they h space. Let us recall e states of matter, wh previous classes, Matter e that matter can exist in th ates viz, solid, liquid and g tuent particles of matter in th ates can be represented as shown Particles are held very close to each ot solids in an orderly fashion and there is much freedom of movement. In liquids, Gases ha neither definite volume nor definite shape. They completely occupy the space in the container in which they hese three states of matter are nvertible by changing the conditions perature and pressure. d-liquid Gas heating, a solid usually changes to " the mixture and its throughout. Sugar solu completely mis particles of comp uniformly distribut the composition is not unifor and sometimes different comp examples of homogened contrast to this, in a heterog visible. For example, mixtures ch , and the liquid on further heating sugar, grains and pulses along wit to gas for vapour). In the reverse a gas on cooling liquifies to the liquid liquid on further cooling freezes to Classification of Matter IX (Chapter 2), you have learnt that macroscopic or bulk level, matter can sified as mixture or pure substance. an be further sub-divided as shown 1.2. in the daily life. It is worthwhile to mention here that the components of a mixture can be separated by using physical methods dirt (often stone pieces), are heteroge mixtures. You can think of many m examples of mixtures which you come acro such as simple hand-picking, filtratio crystallisation, distillation, etc. nce are same in chemical nature, it to be a pure substance. A mixture ns many types of particles. Pure substances have charact of pure substances have fixed c different from mixtures. Constituer particles are close to each other but they en all constituent particles of a Copper, silver, gold, water an move around. However, in gases, the partic way are far apart as compared to those present erate solid or liquid states and their movement easy and fast. Because of such arrangeme Solids have definite volume and definole. Pure substances forming mixture helped in of particles, different states of matter exhi ng aspects the following characteristics: with a fair (i) ternatives to ons), responsible stratosphere, have shape. mixture contains particles of two or Sure substances which may be present any ratio. Hence, their composition is alled its components. Many of the a fixed ratio and its p composition. Hence substances, glucos Also, its consti and oxygen- some examples of pure sub contains carbon, hydrog physical me Pure be homogeneous or heterogéneous. In a atc homogeneous mixture, the components not have definite shape. They take tor example, sugar solution in water, air, into el shape of the container in which they area, etc., are all mixtures. A mixture may of ar refrigerants, (ii) Liquids have definite volume but guances present around you are mixtures. hesised. However, placed.

Topic:

Chemistry

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Question 18122

4 1.1 IMPORTANCE OF CHEMISTRY Chemistry plays a central role in science and is often intertwined with other branches of science. conneeted to Principles of chemistry are applicable n diverse areas, such as weather patterns, unctioning of brain and operation of a omputer, production in chemical industries, tanufacturing fertilisers, alkalis, acids, salts, yes, polymers, drugs, soaps, detergents, etals, alloys, etc., including new material. Chemistry contributes in a big way to the tional economy. It also plays an important e in meeting human needs for food, althcare products and other material led at improving the quality of life. This

Topic:

Chemistry

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Question 18123

4 1.1 IMPORTANCE OF CHEMISTRY Chemistry plays a central role in science and is often intertwined with other branches of science.

conneeted to es Principles of chemistry are applicable in diverse areas, such as weather patterns, functioning of brain and operation of a computer, production in chemical industries, manufacturing fertilisers, alkalis, acids, salts, dyes, polymers, drugs, soaps, detergents, metals, alloys, etc., including new material. Chemistry contributes in a big way to the national economy. It also plays an important role in meeting human needs for food, healthcare products and other material aimed at improving the quality of life. This is exemplified by the large-scale production of a variety of fertilisers, improved variety f pesticides and insecticides. Chemistry rovides methods for the isolation of lifeaving drugs from natural sources and takes possible synthesis of such drugs. ome of these drugs are cisplatin and xol, which are effective in cancer theran

Topic:

Chemistry

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Question 18124

खर-पतवार का क्या अर्थ होता है?

Topic:

Biology

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Question 18125

NaBr

, used to produce

AgBr

for use in photography can be self-prepared as follows:

Fe + Br_{2} ⟶ FeBr_{2}

_{3} FeBr_{2} + Br_{2} ⟶ Fe_{3} Br_{8}

Fe_{3} Br_{8} + Na_{2} CO_{3} ⟶ NaBr + CO_{2} + Fe_{3} O_{4}

(not balanced) (not balanced) 16. Mass of iron required to produce

2.06 \times 1 0^{3} kg NaBr

$420 g$
$420 kg$
$4.2 \times 1 0^{5} kg$
$4.2 \times 1 0^{8} g$

Topic:

Chemistry

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Question 18126

If the yield of (ii) is

60%&

(iii) reaction is

70%

then mass of iron required to produce

2.06 \times 1 0^{3} kg NaE

$1 0^{5} kg$
$1 0^{5} g$
$1 0^{3} kg$
none

Topic:

Chemistry

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Question 18127

If yield of (iii) reaction is

90%

then mole of

CO_{2}

formed when

2.06 \times 1 0^{3} g NaBr

is formed.

20
10
40
None

Topic:

Chemistry

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Question 18128

(2) Stability of carbanion : Stability of Carbanion

\propto \frac{- I effect}{+ I effect}

Example: (1) CC(C)C (2) C[CH]C (3)

CH_{3} - C 8 H_{2}

(4)

C ⊖ H_{3}

3^{\circ}

2^{\circ}

1^{\circ}

More No. of +I group. Less stable carbanion. So stability order

4 > 3 > 2 > 1

Topic:

Chemistry

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Question 18129

Pre-Medical APPLICATION OF I-EFFECT (1) Stability of carbocation : Energy

\approx

charge

\approx \frac{1}{stability}

Stability of carbocation

\approx \frac{+ effect}{- 1 effect}

Example : Stability order : (1) C[C+](C)C

> (2)

C[CH+]C (3)

CH_{3} = CH_{2}

3^{\circ}

2^{\circ}

1. Reason : More no. of

+ l

group. more stable carbocation. so stability order

1 > 2 > 3 > 4

. (2) Stability of carbanion : Stability of Carbanion

\propto \frac{- I effect}{+ I effect}

Example: (1) C[C+](C)C (2) (3)

CH_{3} - CH_{2}

(4)

CH_{4}

3^{\circ}

2^{\circ}

1^{\circ}

More No, of +I group. Less stable carbanion. So stability order

4 > 3 > 2 > 1

Example : (1) [C-]C(F)CC (2) [C-]CC(C)F (3)

□

Minimum distance of

- F

. Maximum -I of

- F

. Minimum negative charge. Maximum stable. So stability order

1 > 2 > 3

Example (1)

C ⊖ H_{2} - CH_{2} \to F

(2)

C ⊖ H_{2} - CH_{2} \to OH

(3)

C ⊖ H_{2} - CH_{2} \to NH_{2}

Maximum -I of

F

Topic:

Chemistry

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Question 18130

Stability of Carbanion

\propto \frac{- I effect}{+ I effect}

Example: (1) CC(C)C (2) CC(C)O (3)

CH_{3} - C ⊖ H_{2}

3^{\circ}

2^{\circ}

1^{\circ}

More No. of

+ I

group. Less stable carbanion. So stability order

4 > 3 > 2 > 1

Topic:

Chemistry

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Question 18131

(2) Stability of carbanion : Stability of Carbanion

\propto \frac{- I effect}{+ I effect}

Example: (1) C[C+](C)C (2) (3)

CH_{3} - C ⊖ H_{2}

(4)

C ⊖ H

3^{\circ}

2^{\circ}

1^{\circ}

More No. of +I group. Less stable carbanion. So stability order

4 > 3 > 2 > 1

Topic:

Chemistry

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Question 18132

velocity of electron in 3rd shell of Li+2 is (c -- velocity of light)

Topic:

Chemistry

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Question 18133

3. Chromatophores:- - Photosynthetic organelle in diatoms. - Possess three membranous envelope \& 3-thylakoid lamellae. 4. Photosynthetic Pigments:- 5. Food Reserve:- Polysaccharide as chrysolaminarin 6. Reproduction:- Chief mode of multiplication is binary fission.

Topic:

Biology

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Question 18134

5. Spore Dispersal:- Spores dispersed by air currents (Anemochory). 6. Spore Germination:- Occur by absorbing moisture from moist (Soil substratum) rich in organic matter. Spore

⟶

Germinate

\to

Produce single naked haploid cell (with single nucleus) named Myxamoeba. (Myxomytetes) The nucleus of myxamoeba multiply repeatedly by "Repeated Karyokinesis". Thus the cell enlarge in size and become multinucleate \& now become plasmodium.

Topic:

Biology

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Question 18135

The minimum value of

y = \frac{12}{3 s i n θ + c o s θ}

for

0 < θ < \frac{π}{2}

Topic:

Physics

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Question 18136

Three forces

F_{1}, F_{2}

and

F_{3}

are represented as shown. Each of them is of equal magnitude.

∣ f_{1} ∣ = (f_{2}) = (f_{3})

Column I (Combination)

$F_{1} + F_{2} + F_{3}$
$F_{1} - F_{2} + F_{3}$
$F_{1} - F_{2} - F_{3}$
$F_{2} - F_{1} - F_{3}$

Topic:

Physics

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Question 18137

Sow many oxygen atoms are present in

1 leg

molecule

HSO_{4}

Topic:

Chemistry

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Question 18138

Select the correct statement(s) (A) In

He

, maximum degenerate orbitals in '

O

' energy level is 9 whereas in

He^{+}

, it is 25 . (B) In

Li^{+}

, energy is absorbed/released to change the value of '

n

' and '

ℓ

' of electron whereas in

Li^{+ 2}

energy is absorbed/réleased only to change the value of '

n

' of electron. In

He

and

Li

, energy of

2 s

subshell is same as both are multielectronic system D) Exchange energy also plays a role in differentiating energy of various subshells in same energy level in multielectronic system compared to monoelectronic system. QN0089

Topic:

Chemistry

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Question 18139

(Significant figures) 31. The number of significant figures in a pure number 410 is

Two
Three
One
Infinite

Topic:

Physics

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Question 18140

In simple pendulum length increases

4%

and increased by

2%

. Fin time period of simple pendulum

1 = 2 π \frac{l}{g} \frac{Δ I}{P} = \frac{i ^{1/2}}{g ^{1/2}} \frac{Δ T}{T} \times 100 = \frac{1}{\neq 2} \times (\frac{2}{n}) - \frac{1}{22} (2) = 2 - 1 = 1 n (n + 1)

n^{-}

an experiment, the percentage of curved in the measurement of ph y antities

A, B, C

and

D

are

1%, 2%

4%

respectively. Then the max tentage of error in the measureme here

X = \frac{A ^{2} B ^{1/2}}{C ^{1/3} D ^{3}}

, will be

(\frac{3}{13}) %

(2)

16%

- 10%

(4)

10%

Topic:

Physics

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Class 11 Science Questions asked by Filo students

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