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ong>ANSWER:

chemical change

Explanation:

bcoz the colour cannot be RETAINED PHYSICALLY

ong>Answer:

Both A and R is CORRECT ; R is the correct explanation of A.

Explanation:

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It's right MATE which is WRITTEN above

complete your QUESTION PLEASE

Because  Group 16 ELEMENTS CONTAIN 6 electrons in its valence SHELL

Explanation:

5°c ∆G° for the PROCESS H20(l)=H20(g)is 8.6kj.The vapour pressure of WATER at this TEMPERATURE is nearly 23.17

The change of a substance from one phase to another phase is called a physical process. The equilibrium attained in physical PROCESSES is called physical equilibrium. SOLID – Liquid Equilibrium. Example: ICE(s) ⇌ Water(l) . It is a physical equilibrium because no CHEMICAL reaction is involved.

ong>Answer:

it's RIGHT now mate which is WRITTEN above

Explanation:

Dry HCL it does not DISSOCIATE to give H+ IONS. ACIDS dissociate to give ions only in the aqueous solution. In this, HCL is not in the aqueous FORM nor the litmus paper is wet, so the colour of the litmus paper does not change.

ong>ANSWER:

Actinoids or actinides are 15 consecutive chemical ELEMENTS in the periodic table from actinium to lawrencium (atomic NUMBERS 89103). As a group, they are significantly LARGE because of their radioactivity. ... These elements are ALSO called the actinide elements.

OPTION a

Explanation:

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Answer :- When dilute sulphric acid reacts with ZINC granules, then zinc SULPHATE and HYDROGEN gas are formed. Zinc being more reactive than hydrogen, displaces it from sulphuric acid. This liberated hydrogen is evolved as hydrogen gas.

dilute sulphric acid reacts with zinc granules, then zinc sulphate and hydrogen gas are formed. Zinc being more reactive than hydrogen, displaces it from sulphuric acid. This liberated hydrogen is evolved as hydrogen gas.Thus, the container becomes hot .

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ong>Answer:

The ELEMENTS in which ELECTRONS are PROGRESSIVELY filled in 4f orbitals are called Lanthanides

Explanation:

Mg2+

Explanation:

all other SPECIES CONTAIN 18 electrons

Molar mass of H2O = 18 g mol-1. 18 g of H2O CONTAINS = 6.022×1023 molecules. 10 g of H2O cotains =6.022×102318×10 = 3.34×1023 molecules.

ong>Answer:

At 140°C in the PRESENCE of sulfuric acid two molecules of ETHANOL are dehydrated (lose a MOLECULE of water) to FORM ether. The sulphuric acid is regenerated and reused

more shielding, the further the VALENCE shell can SPREAD out and the bigger atoms will be. The effective nuclear charge is the NET POSITIVE charge experienced by valence electrons. It can be approximated by the equation: Zeff = Z – S, where Z is the atomic number and S is the number of shielding electrons.

ong>Explanation:

An Absorption spectrum occurs when light passes through a COLD , dillute gas and atoms in the gas absorb at characteristics frequencies ; since the- reemited light is unlikely to be EMITTED in the same direction as the ABSORBED PHOTON , this gives rise to dark lines (absence of light ) in the spectrum.

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ong>Explanation:

3d ACCORDING to n+ l RULE

ong>Answer:

Sodamide and hydrogen gas

Explanation:

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ong>ANSWER:

(ELECTRON gain entalapy) is the CORRECT option

ong>Answer:

B

Explanation:

BECAUSE THE MENTION ELEMENTS HAVE NOT -VE CHARGE

SO THIS IS INCORRECT MATCH

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inert gas=configaration 10 which is neon

non metal=7 nitrogen

chemically simillar=12 and 4 as they have same valency, IE 2 valence electrons

Hi friend

Hope this answer helps you

Explanation:

The uncertainty in position is EQUAL to de Broglie wavelength.

⟹Δx=λ=

mv

h

....... (1)

The HEISENBERG's uncertainty principle is ΔxΔv≥

4πm

h

...... (2)

From equations (1) and (2),

(

mv

h

Δv≥

4πm

h

)

Thus,

v

Δv

≥

4π

1

Hence, minimum percentage error =

v

Δv

×100=

4π

100

=7.96≈8.

Calcium oxide

Calcium oxide (CaO), COMMONLY known as quicklime or burnt lime, is a widely used CHEMICAL compound. It is a white, caustic, ALKALINE, crystalline SOLID at room temperature.

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ong>Answer:

Now, this is an interesting question!! Let’s understand this question by solving it mathematically.

Explanation:

The De Broglie’s relation gives us the relation between a moving particle’s WAVELENGTH with its MOMENTUM in other words it tells us that a particle can exhibit the properties of waves, i.e.

λ = h/p= h/mv

where λ= wavelength

         h= Plank’s Constant

         p = momentum

        m= MASS of a particle

         v= velocity of the mass

Here we are given that wavelength is equal to the distance travelled by the electron in 1 second, i.e.

λ = h/(m * (1 second))

Now let’s solve for v:

v^2= h/(m * (1 second))

v = √((h)/(m*(1 Second)))

where Plank’s Constant, h = 6.626 x 10¯34 J s

mass of electron, m = 9.10939 x 10¯31 kg

Place the values for h and m in the above EQUATION that we have solved for v, i.e.  

v = √((6.626 x 10¯34 J s)/(9.10939 x 10¯31 kg*(1 Second)))

v = 0.027 m/s

THEREFORE, the electron is moving with a velocity of 0.027 m/s.

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what is this ????????????

B is the best answer for your question please mark my answer as BRAINLIEST answer I will follow you

catalyst.

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ांबे के तार का एक टुकड़ा जलीय सिल्वर नाइट्रेट के घोल में डुबाया जाता है तो सावधान नीला हो जाता है यह एक परिणाम है।

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ong>Answer:

This PLANAR carbocation is attacked by NUCLEOPHILE from both the sides EQUALLY to FORM d and L isomers in equal proportion. Such products are called racemic mixture. Hence, SN1 reactions are accompanied by racemisation in optically active alkyl halides.

principle QUANTUM NUMBER is 2

azimuthal quantum number is 1

magnetic quantum number is -2,-1,0,1,2

spin quantum number is -1/2

didnot KNOW THA answer sorry

mate your answer is here...........

The atomic mass of iron (FE) is 55.85 amu. The atomic mass of radium (Ra) is 226 amu. One mole of atoms of any element contains 6.022 X 1023 atoms, regardless of the type of element. The mass of one mole of an element depends on what that element is, and is EQUAL to the atom mass of that element in grams.

+1,1/2

ong>EXPLANATION:

because as soon as WATER REACHES 100C it evaporates/boils and runs away

answer is ch3chohch2cooh

Ga ELEMENT

group 3 A

covalent bonds

Explanation:

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ong>Answer:

The ATOMIC number = 12

The element is MAGNESIUM .

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ong>Answer:

HI friend

Hope this answer helps you

The answer is 8

Explanation:

ACCORDING to question, uncertainty in position is equal to De broglie wavelength,

therefore dx=

mv

h

Now, according to uncertainity principle, dx.dp=

4π

h

as minimum is required.

So, mdv.dx=

4π

h

.

By putting the value of dx from above, we GET

v

dv

=

4π

1

.

So % ERROR =

v

dv

×100=

4π

100

=8

ong>Answer:

Endemic SPECIES are plants and animals that exist only in one GEOGRAPHIC REGION. Species can be endemic to large or small areas of the earth: some are endemic to a particular CONTINENT, some to part of a continent, and others to a single island.

Explanation:

it's ATOMIC no. is 12

magnesium

positive ion

ong>Answer:

two flasks a and b of EQUAL VOLUME contain so3 and pH 3 gas respectively under similar condition which flowers have more number of MOLES

ong>Answer:

Government has given special attention to nutrition by upgrading the mechanisms of ploughing, fielding, FARMING and products made in factories with better ingredients. Government has ALSO provided free food in AREAS where there is POVERTY or people SUFFERING from malnutrition.

oxidation state of K and O respectively +1,-1/2

orrect opinion is (D)

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A ball of mass 100 g is moving with a velocity of 100 msec-1. Find its wavelength. λ=(6.626×10-34kgm2s-1)(0.1kg)×(100ms-1)=6.626×10-35m.