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EXPLANATION:

METALS:-

• These are very HARD except sodium
• These are malleable and ductile
• These are shiny
• Electropositive in nature

non METAL:-

• These are soft except diamond
• These are brittle and can be BREAKDOWN into pieces
• These are non-lustrous except iodine
• Electronegative in nature

ANSWER:d)all

Explanation:

1

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Answer:

salt

Explanation:

it will give ZINC CHLORIDE and HYDROGEN

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Answer:

A homologous series is a family of hydrocarbons with SIMILAR chemical properties who share the same general formula. We will look at three hydrocarbon series: ALKANES, alkenes and the cycloalkanes. Hydrocarbons are compounds that contain only HYDROGEN and CARBON.

Explanation:

Carbon is a versatile element and is found in many DIFFERENT chemical compounds, INCLUDING those found in space. Carbon is versatile because it can form SINGLE, double, and triple bonds. It can also form chains, branched chains, and RINGS when connected to other carbon atoms.

Covalent bonds are chemical bonds that FORM between nonmetals. In a covalent BOND, two atoms share a pair of electrons. By forming four covalent bonds, carbon shares four pairs of electrons, thus FILLING its OUTER ENERGY level and achieving stability.

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ANSWER:

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ANSWER:

Answer:

The concentration of H+ (AQ) ions determines the acidic NATURE of solution. ... Answer: Yes basic solutions also have H+(aq) ions. They are basic because the concentration of hydroxide (OH−) is more than the H+(aq) ions

Explanation:

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Answer:

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Answer:

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ANSWER:

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Explanation:

When calcium carbonate reacts with hydrochloric acid, it produces carbon DIOXIDE gas with effervescence. Carbon dioxide used as fire EXTINGUISHER. HENCE, it extinguishes a burning candle. Therefore, the metal compound A is calcium carbonate.

ANSWER:

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ANSWER:

EXPLANATION: CARBOXYLIC PENTA OXIDE

Answer:

The CHEMICAL equations are

S₂ + O₂ ====> SO₂              (When sulphur and OXYGEN combine)

SO₂ + H₂O ====> H₂SO₄    (When the PRODUCT is immersed in water)

The product FORMED is sulphuric acid....When oxygen reacts with sulphur, sulphur dioxide is formed.The nature of sulphur dioxide is ACIDIC.

Answer:

Frenkel defect, an ion is displaced from its LATTICE place to an INTERSTITIAL place. So, there is no loss or GAIN of ions in lattice structure.

It involves only the migration of the ions WITHIN the crystal, thus preserving both volume and mass.

Therefore, there is no any change in density of the of the crystal.

Answer:

A HALOGEN lamp, also known as a tungsten halogen, quartz-halogen or quartz IODINE lamp, is an INCANDESCENT lamp consisting of a tungsten filament SEALED into a compact TRANSPARENT envelope that is filled with a mixture of an inert gas and a small amount of a halogen such as iodine or bromine.

Given:

Mass of Marble, W = 30 gm

The volume of CO2 evolved = 3360 cm³ = 3.36 L

To FIND:

The PERCENTAGE of CACO3 in the marble.

Calculation:

- At STP, 1 mole = 22.4 L

-

- The reaction of CaCO3 with HCl is given as:

CaCO3 + HCl = CaCl2 + CO2 + H2O

⇒The mass of CaCO3 that gives 22.4 L (1 mole) of CO2 = 100 gm

⇒ The mass of CaCO3 that gives 3.36 L of CO2 = (100/22.4) × 3.36

⇒ w = 15 gm

- Percentage of CaCO3 = w/W × 100

⇒ % CaCO3 = 15/30 × 100

⇒ % CaCO3 = 50 %

- So, the percentage of CaCO3 in the marble is 50 %.

ANSWER:

i. NEGATIVELY charged species.

ii.noble gas

iii. covalent MOLECULE.

iv.metal

v. neutron

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Answer:

4,HETEROGENEOUS mixture.

5. PURE SUBSTANCE.

Explanation:

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EXPLANATION:

but molecules are generally NAMED after their highest priority functional GROUP which in the

case of glucose is an aldehyde when it's not in the cyclic hemiacetal form. So no I wouldn't call it an ALCOHOL. ... Glucose is not stored in the BODY.

i) Na is oxidised .. its oxidation number increases from 0 to +2

and oxygen is reduced from 0 to -2

ii) Cu is reduced as it LOSES oxygen. and the oxidation number reduces from +2 to 0.

and HYDROGEN is oxidised at it gains oxygen and the oxidation number increases from 0 to +2.

iii) ZN is reduced as it loses oxygen and C is oxidised as it gains oxygen.

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Answer:

a) MATERIAL of work piece should be HARDER than the cutting TOOL. b) cutting tool should be harder than the material of work piece.

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ANSWER: Pure WATER mostly consits of atoms. Pure water is called distilled water or deionized water. Natural water or pure water consists MAINLY of the isotopes hydrogen-1 and oxygen-16. A water molecule consists of three atoms; an oxygen atom and two hydrogen atoms, which are bond together like little magnets.

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ANSWER:

nucleophilic SUBSTITUTION

Explanation:

the PRODUCT of the reaction is Et2NCH2CH(OH)CH3.

in a basic medium nucleophilic substitution is favoured because it CAUSES the release of ACID.

Answer:

kyuki TURMERIC is natural INDICATOR which only REACT with BASE

ANSWER:

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ANSWER:

oxidation.

4. c43 -СН = СН

cha

ОН

2

Answer:

PBS should formed

Explanation:

SOLUTION BECOMES BLACK in COLOUR

ANSWER:

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ANSWER:

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Answer:

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Explanation:

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Answer:

1) single covalent bond

2) double covalent bond

3) TRIPLE covalent bond.

Explanation:

when both the atoms share only one ELECTRON then they FORM single covalent bond.

when they share 2 electrons each then they form double covalent bond.

And when they share 3 electrons each then they form triple covalent bond.

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Answer:

The other less recognised metalloids are:carbon, aluminium, SELENIUM, polonium and astatine. Titanium is a lustrous transition metal with a silver colour, low density and high strength KINDLY HELP US to KEEP GK Today update and error free.

ANSWER:

i) Displacement reaction

ii) Combination reaction

iii) DECOMPOSITION reaction

iv) Precipitation reaction

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Fe2So4

endothermic reaction .

FE2 + SO4 = FE2O3+ Si2 + So3

Answer:

Energy required to melt 1g ice =33J.

Energy required to melt 10g ice =33×10=330J.

Radiation frequency (ν)=4.67×10

13

s

−1

As we know, the energy of radiation is GIVEN by:

E=hν

Here, H= Planck's constant =6.62×10

−34

J.s

∴E=6.62×10

−34

×4.67×10

13

⇒E=3.09×10

−20

J

∴ No. of quanta required =

3.09×10

−20

330

=1.067×10

22

Hence, the correct option is (A).

Explanation:

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ANSWER:

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ANSWER:

N22- molecule is more PARAMAGNETIC. This is because there is no UNPAIRED electron in N2 molecule while N22-contains 2 unpaired ELECTRONS.

ANSWER:

THE ANS IS IN EXPLANATION :)

Explanation:

(i)

(ii)

(III)

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Answer:

The major limitations of Newlands' law of OCTAVES were : (i) It was APPLICABLE to only lighter elements having atomic masses upto 40 u, i.e., upto calcium. ... But later on several NEW elements were discovered WHOSE properties did not FIT into the law of octaves.

ANSWER:

DISEASE is the ANS

Answer:

When acid is MIXED with a SOLUTION of base it results in neutralization reaction. Neutralization is an exothermic reaction which RESULT in the FORMATION salt.....

The MELTING point of a PURE substance is always higher and has a smaller range than the melting point of an impure substance or, more generally, of mixtures. The higher the QUANTITY of other components, the lower the melting point and the broader will be the melting point range, often referred to as the "PASTY range".

Darkening may be due to physical, CHEMICAL, biological or microbiological deterioration of jaggery. REDUCING sugar, poly phenols, organic NON sugars, proteins and IRON are main FACTORS affecting colour of jaggery

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ANSWER:

SOLUTE. PLEASE MARK BEST answer

ANSWER:

REMEMBER all ELEMENTS in GR. 18