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101.

Rate of diffusion of gases is higher than the liquids and solids why​

Answer»

Explanation:

This is called Graham's LAW of DIFFUSION. The rate of diffusion is higher in gases from that of liquids DUE to very less INTERMOLECULAR forces of attraction between the GAS molecules.

102.

What kind of plastic is used in manufacturing toys and electrical switches.​

Answer»

Answer:

Explanation:

Such plastics are called THERMOSETTING plastic. BAKELITE and melamine are examples of thermosetting plastic. Bakelite is used for making ELECTRICAL switches and switchboards because it is a poor conductor of HEAT and electricity.

103.

What happens when a piece of iron is kept out side​

Answer»

★᭄ꦿ᭄Answer★᭄ꦿ᭄

The surface of a PIECE of IRON will corrode first in the PRESENCE of oxygen and water. Given enough time, any piece of iron will change entirely into rust and disintegrate. The process of rusting is a combustion reaction, SIMILAR to fire. Left in contact with oxygen, iron will react with the oxygen to form rust.

104.

The log of heat did not catch fire easily whereas oil and paper did. Why?​

Answer»

Answer:

The ignition temperature required by PAPER to CATCH fire is LOW. So, paper by itself catches fire easily. When the same paper is wrapped around an aluminium pipe, it does not. This is because aluminium being a METAL is a good CONDUCTOR of heat and absorbs the heat energy.

105.

Melting points of four solids W, X ,Y and Z are 398K, 534K , 625K, and 423K respectively. The solid having maximum forces of attraction between its particles

Answer»

ANSWER:

Y SOLID having maximum forces of ATTRACTION between its PARTICLES

106.

What are the products formed when barium chloride reacts with sodium sulphate_____answer correctly..​

Answer»

ANSWER:

to FORM BARIUM SULPHATE and sodium chloride.

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107.

My cousin is coming at my home​

Answer»

ANSWER:

ohkk

Explanation:

GOOD MORNING have you wonderful day with your cousin 。◕‿◕。

108.

What happens when solid is heated explain using kinetic theory,pls answer this fast ​

Answer»

Answer:

When a solid is heated the particles gain energy and START to VIBRATE faster and faster. ... The particles in the liquid are the same as in the solid but they have more energy. To melt a solid energy is required to overcome the ATTRACTIONS between the particles and ALLOW them to pull them apart

Explanation:

109.

In sublimation energy is released or absorbed​

Answer»

ANSWER:

ENERGY is ABSORBED in SUBLIMATION PROCESS

110.

Complete the table....​

Answer»

Answer:

You can search for the answer on the official WEBSITE of NCERT.

Explanation:

It WOULD be more helpful!

111.

Is hydrogen concentration lesser on neutral solution than is basic ones?​

Answer»

ANSWER:

Hydrogen ion CONCENTRATION is more CONVENIENTLY expressed as pH, which is the logarithm of the reciprocal of the hydrogen ion concentration in gram moles per liter. Thus, in a neutral SOLUTION the hydrogen ion (H+) and the hydroxyl ion (OH−) concentrations are EQUAL, and each is equal to 10−7. A pH of 7 is neutral.

112.

The outermost subshell electronic configuration of an element is 2s^2 2p^4 what is its valency ?​

Answer»

Answer:

hi

Explanation:

the answer is in the attachment

and WATCH the videos in u TUBE u can GET explained indetail

113.

45digree the cone kom​

Answer»

Answer:45 DEGREE Angle

Construct a PERPENDICULAR line.

Place COMPASS on intersection point.

Adjust compass width to reach start point.

Draw an arc that intersects perpendicular line.

Place RULER on start point and where arc intersects perpendicular line.

Draw 45 Degree Line.

Explanation:

114.

SHELL STRUCTURE FOR ANTIMONY WITH REASON, MY ANSWER WAS 2,8,18,23 BUT IT IS 2,8,18,18,5 PROVE IT

Answer»

ANSWER:

Antimony is a chemical element with the symbol Sb (from Latin: stibium) and atomic number 51. A lustrous gray metalloid, it is FOUND in NATURE mainly as the sulphide mineral stibnite (Sb2S3).

Antimony

Block p-block

Electron configuration [KR] 4d10 5s2 5p3

Electrons per shell 2, 8, 18, 18, 5

Physical properties

Explanation:

115.

Substance X on strongly heating produces oxide of X and a gas Y. The gas Y on passing through Liquid Z it gives white insoluble substance W. Identify X, Y, Z, and W. Write the balance chemical equations for both the reactions​

Answer»

Answer:

(b)Sodium hydrogencarbonate on reaction with hydrochloric acid GIVES sodium chloride, water and liberates carbon dioxide.

(C)Copper sulphate on treatment with POTASSIUM IODIDE precipitates cuprous iodide (Cu2I2), liberates IODINE gas and also forms potassium sulphate.

116.

What is the principle of distillation ?

Answer»

ANSWER:

PRINCIPLE of Distillation

It is heating the liquid to form a vapour and then cooling it to get back the liquid. It is used to separate components of a mixture containing two miscible LIQUIDS that boil WITHOUT decomposition and have sufficient difference in their BOILING points.

117.

Silk is derived from​

Answer»

ANSWER:

a. cocoon

Explanation:

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118.

What is the reaction of gold when it comes in touch with merury​

Answer»

Answer:

amalgamation

That is, if it touches gold it will immediately break the lattice BONDS of the precious metal and form an ALLOY in a process known as amalgamation. A process which, when catalyzed between a dab of mercury and a sheet of gold LEAF, looks like the ignition of a metallic FIRE in reverse.

Explanation:

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119.

Rahul wants to separate beads of different sizes the easiest way to separate them would bea) Handpicking b)seiving c) winnowing d)all of them​

Answer»

ANSWER:

B) SEIVING

Explanation:

HOPE THIS HELPS YOU!! :D

120.

The formation of sugar solution is a physical change why?? pls answer rhis fast.​

Answer»

Answer:

Dissolving sugar in water is an EXAMPLE of a physical CHANGE. Here's why: A chemical change produces new chemical products. In order for sugar in water to be a chemical change, something new would need to result. If you EVAPORATE the water from a sugar-water solution, you're LEFT with sugar.

Explanation:

HOPE it will help you

121.

The least reactive metals known as noble metals are--​

Answer»

ANSWER:

COPPER jjhhhhhhjjhhjii

122.

A metal is used in bells due to its property of -----------a) Ductilityb) Sonorosityc) Lustred) Tensile Strength​

Answer»

Hey mate!

Here's ur answer:-

Answer:

OPTION B Sonorous

Explanation:

Metals are used in bells because Metals are Sonorous.

Hope it helps u!!

THANKS for ASKING this QUESTION!!

#Be_Brainly_

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me

123.

give an example of a substance that exist s in different physical states in nature. name the different states?​

Answer»

ANSWER:

Forms of MATTER that are not composed of molecules and are organized by different forces can ALSO be considered different states of matter. Superfluids (like Fermionic condensate) and the quark–gluon plasma are EXAMPLES.

124.

Calculate PH of solution having hydrogen Ion concentration is 0.0001 mol L -1 . Also mention  the nature of solution.​

Answer»

Answer:

PH= −LOG

10

[H

+

]

= −log

10

(0.001)

= −log

10

(10

−3

)

= −(−3)log

10

10

pH=3.

01

Explanation:

please MARK me as braibliest

125.

Differentiate between boron and mercury​

Answer»

Answer:

Compare Boron and Mercury on the BASIS of their properties, ATTRIBUTES and periodic table facts. Compare elements on more than 90 properties. All the elements of similar categories show a lot of SIMILARITIES and differences in their chemical, atomic, physical properties and uses. These similarities and dissimilarities should be known while we STUDY periodic table elements. You can study the detailed comparison between Boron vs Mercury with most reliable information about their properties, attributes, facts, uses etc. You can compare B vs Hg on more than 90 properties like electronegativity , oxidation state, atomic shells, orbital structure, Electronaffinity, physical states, electrical CONDUCTIVITY and many more.

126.

X(-x-y)please give the answer fast​

Answer»

This is the ANSWER ...Do MARK me as the BRAINLIEST....

X(-x-y)

=-x^2-xy

127.

অ্যামোনিয়ার অনুতে একটি নাইট্রোজেনের ও তিনটি হাইড্রোজেন পরমাণু বর্তমান। অ্যামোনিয়া নাইট্রোজেনের যোজ্যতা কত তা নির্ণয় করো​

Answer»

Answer:

hope HELPS U dear FRIEND HMM

128.

List five examples of heavy chemicals

Answer»

Products include salt, chlorine, caustic soda, soda ash, acids titanium DIOXIDE, and hydrogen peroxide. FERTILIZERS are the smallest CATEGORY and include phosphates, AMMONIA, and POTASH chemicals.

hope it helps u..

129.

9. A bottle of fizzy water stated that ‘when evaporated completely the mass of solid residue remaining is 200mg/dm3 of water’. Plan an experiment to check the mass of solid formed when the fizzy water is completely evaporated. You are provided with a 500cm3 bottle of the water. You can use the space below to draw a diagram of the apparatus you would use if you wish.

Answer»

EXPLANATION:

sorry abhi MAI CHEMISTRY nahi padhti warna BATA deti sorry i need points

130.

can anyone tell that can I it melt on gas stove in kitchen on pan or in some vessel if no how to melt in home with home remedies. please anwer it revalantly I need your help please ​

Answer»

ANSWER:

no we can't MELT in HOME .

131.

can anyone tell that can I it melt on gas stove in kitchen on pan or in some vessel if no how to melt in home. please give me answer only with home remedies we must burn to liquid state ​

Answer»

ANSWER:

WITH HOT WATER..

THIS MAY HELP YOU

132.

can anyone tell that can I burn this on pan or any other vessel and burn it on gas stove if not tell how burn and bring to liquid state in home and in simple home remedies​

Answer»

Why do you even want to burn it if you have COIL then USPE laga KE machhar bhagao

133.

Why strong bases cannot be used to neutralize the strong acids secreted in stomach ?​

Answer»

ANSWER:

Why is a strong soluble BASE like NaOH not used in ANTACID TABLETS. NaOH is not used in antacid tablets because it is harmful to the tissues. Doing so cancause serious damage, or EVEN dissolvement of vital organs.

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134.

of colloidthe particles al solution can be seperated :- a)evaporation b)filtration c)centrifugation d)distilation

Answer»

Answer:

(c) Centrifugation

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135.

The word science comes from the Latin word _______ which means ________.​

Answer»

Answer:

The word science COMES from the Latin word SCIENTIA which means KNOWLEDGE .

EXPLANATION:

I HOPE this will helpful to you

136.

And Define density. How is it related to floating sinuking in water.​

Answer»

Answer:

The leaves of CERTAIN plants EXHIBIT droplets of water along their margins in the morning. This PARTICULARLY happens in plants growing in warm humid conditions. A humid environment hampers transpiration while the roots continue to absorb water from the soil. This builds up a big hydrostatic pressure within the plant and “forces out” the excess water directly from the tips of VEINS in the leaf. Special pore-bearing structures called hydathodes are present on the margins of the leaf to ALLOW this exudation.

137.

Why is an antacid tablet taken when we suffer from acidity ?​

Answer»

ANSWER:

Because ANTIACID TABLETS have BASE in them.

138.

5mL of a gaseous hydrocarbon was exposed to 30mL of O2​. The resultant gas, on cooling is found to measure 25mL of which 10mL are absorbed by NaOH and the remainder by pyrogallol. Determine molecular formula of hydrocarbon. All measurements are made at constant pressure and temperature.​

Answer»

ANSWER:

once VERIFY the answer. If it is CORRECT no PROBLEM orelse POST it again

139.

state the 'law of conversation of mass'. state the main points of Landolt's experiment for experimental evidence of the law

Answer»

Answer:

your answer

Explanation:

The ‘law of conservation of MASS’ says that mass in an isolated system is neither CREATED nor destroyed by chemical reactions or physical transformations. The mass of the products in a chemical reaction must equal the mass of the reactants.

In Landolt’s experiment, NaCl\ and\ AgNO_3 were taken in a U-Shaped tube and WEIGHED. The tubes were tilted to let the solutions mix and react with each other. They were weighed again and the weight was the same as before.

please mark it as brainlist answer

140.

Part 0 Q.2 How does sugar desolve in water? ​

Answer»

SUGAR dissolves in water because energy is given off when the slightly polar SUCROSE molecules form INTERMOLECULAR bonds with the polar water molecules. The weak bonds that form between the SOLUTE and the solvent compensate for the energy needed to DISRUPT the structure of both the pure solute and the solvent.

141.

0.2 How does sugor desolve in water?​

Answer»

Answer:

Sugar dissolves in WATER because energy is given off when the slightly POLAR SUCROSE molecules form intermolecular bonds with the polar water molecules. The weak bonds that form between the solute and the solvent compensate for the energy needed to disrupt the structure of both the PURE solute and the solvent.

142.

The number of open chain structural isomers possible for C4H6​

Answer»

Answer:

4

Explanation:

OPEN CHAIN ISOMERS of C 4 H 6

are 4. Which are:

1-butyne, 2-butyne, 1,3-butadiene and 1,2-butadiene.

143.

@ Moderators ⭐@ star ⭐⭐⭐✨@ Best Users.. please answer this question in 2 minplease​​​​​ answer this​

Answer»

ANSWER:

h multidimensional TRANSFORMATIONAL recommendations for sinicontroversialjaldi neem,haldi,tulsiिक%Rodrick HALL

144.

Write down any five importance of doctor​

Answer»

Answer:

HOPE it helps

Explanation:

Doctors are responsible for increased life expectancy and improved well-being in society. People who survive DISEASES such as CANCER usually owe their survival to doctors, whose skills and DEDICATION are vital for their cure.

145.

What would you observe when a saturated solution of potassium chloride prepared at 600 C is allowed to cool to room temperature? Give reason.​

Answer»

ANSWER:

YES

Explanation:

potassium chloride prepared at 600 C is ALLOWED to COOL to room temperature

146.

Lucy has a mixture of marble and iron.She can use a sieve to separate this mixture.Explain why.

Answer»

ANSWER:

uiuuuuuuuuuu bbbbbmmmmm

Explanation:

bbbbbbbbcbbcnc the GREATEST of 24 the

147.

Compare the reactivity of sodium metal and aluminium metal with Water and dilute HCL​

Answer»

Answer:

as we know sodium is highly reactive metal when kept in open air....it can readily react with air and can also burn ....also it is a very soft metal so can be cut easily with a knife ....

On the other hand Aluminium metal is not much reactive and soft ....

EXPLANATION:

chemical reaction :-

When an acid REACTS with metal, a salt and hydrogen are produced:

acid + metal → salt + hydrogen

The salt that is produced depends upon which acid and which metal react.

Sodium metal reacts with hydrochloric acid which PRODUCES hydrogen gas and sodium CHLORIDE.

2Na(s)+2HCl(aq)→2NaCl(aq)+H2(g)

The REACTANTS are sodium metal and hydrochloric acid.

The product are hydrogen gas and sodium chloride solution.

148.

Why we need to separate the substance​

Answer»

ANSWER:

we NEED to SEPARATE the SUBSTANCES only for MAZA

149.

What is the advantage of sentetic fiber​

Answer»

Answer:

PROS. Synthetic fibers are more durable than most natural fibers and will readily pick-up different DYES. In addition, many synthetic fibers offer consumer-friendly functions such as stretching, WATERPROOFING and STAIN resistance. Sunlight, moisture, and oils from human skin cause all fibers to break down and wear away ...

150.

What are acids and bases ?​

Answer»

ANSWER:

An acid–base REACTION is a CHEMICAL reaction that occurs between an acid and a base. It can be used to DETERMINE pH.