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ain-previous-year-papers-questions-with-solutions-physics-properties-of-matter/It lies horizontally, the middle 5 cm containing MERCURY and the two equal ends containing AIR at the same pressure P. When the tube is HELD at an angle of 60° with the vertical direction, the length of the air column above and below the mercury column are 46 cm and 44.5 cm respectively. Calculate the pressure P in centimetre of mercury. (The temperture of the system is KEPT at 30° C). [1986-6 marks]

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tion:Average atomic mass = f1M1 + f2M2 +… + fnMn where f is the FRACTION representing the natural abundance of the ISOTOPE and M is the mass number (weight) of the isotope. The average atomic mass of an element can be found on the periodic table, typically under the ELEMENTAL SYMBOL.

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helpedExplanation:verification.In physics and materials SCIENCE, elasticity is the ability of a body to resist a distorting influence and to return to its original size and shape when that influence or force is REMOVED. Solid OBJECTS will deform when adequate loads are APPLIED to them; if the material is elastic, the OBJECT will return to its initial shape and size after removal. This is in contrast to plasticity, in which the object fails to do so and instead remains in its deformed state.

the products of ACID and metal REACTIONS are SALT and hydrogen gas . some metals so UNREACTIVE they do not react with dilute ACIDS at all.

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In a redox REACTION, TRANSFER of electrons takes place from the reducing agent to the oxidizing agent. In the above reaction, zinc atoms remove electrons and get oxidized to zinc ions. Similarly, CUPRIC ions gain electrons and get reduced to copper atomsExplanation:plz FOLLOW me

oxides, or acid ANHYDRIDE, are oxides that react with WATER to FORM an acid, or with a base to form a salt. They are oxides of either nonmetals or of metals in high oxidation states. KEEP smiling ❣️

Carbolydrates present in food are broken down to form glucose. This glucose combines with OXYGEN in the cells of our BODY and provides ENERGY. This reaction is known as respiration. HENCE,respiration is considered as an exothermic reaction.

tion:in the test tube, the two gases will diffuse towards each other. -When the two gases meet INSIDE the test tube they react with one ANOTHER and form a RING of AMMONIUM chloride that is white in color. ... This is because hydrogen chloride gas is heavier and diffuses slower than ammonium chloride.

ngfgjkjbExplanation:mmbvhjmmkggghjj

moleculer oxyzen molecular WEIGHT is 32 grams and 1 GRAM molecular weight of WATER H2O moleculer weight approximately 18 grams

(B)2.83Explanation:Let, no. Of unpaired electrons= NSQUARE root of [N(n+2)] = SQUARE root of [ 2(2+2) ] = 2.83 BM

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ANSWERLet us consider a sample containing 100 g NxOyFor N⇒x×14= 100100×25.94 ⇒x=1.85For O⇒y×16= 100100×74.09 ⇒y=4.63So, N 1.85 O 4.63 ⇒N 2 O 5 (Empirical Formula)EXPLANATION:PLEASE mark me as brainliest and follow me on

) At normal dilution, VALUE of is nearly 1 for STRONG electrolytes, while it is very less than 1 for weak electrolytes.(ii) Higher the dielectric constant of a solvent more is its ionising power. ...MAY it helps YOUPLEASE mark me as Brainliest☺☺☺

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tion:FOLLOW these rules to balance simple redox equations: WRITE the oxidation and reduction half-reactions for the species that is reduced or oxidized. Multiply the half-reactions by the appropriate number so that they have EQUAL numbers of electrons. Add the two equations to cancel out the electrons.I HOPE IT WILL HELP YOU FOLLOW ME

Fe2O3 + 3H2. 2Fe + 3H2OIron(III) oxide react with hydrogen to PRODUCE iron and WATER. This REACTION takes place at a TEMPERATURE of 1050-1100°C.

But if it's just ZINC and copper, you can dissolve the brass in HYDROCHLORIC acid with air BUBBLED through it (the air is needed as an oxidizer) and precipitate the copper by reduction with ascorbic acid (the zinc will REMAIN in solution, as ascorbic acid is not a strong enough reducing agent to precipitate it).

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Na+ has HIGHER value of ionization enthalpy than Ne, though both have same ELECTRONIC CONFIGURATION. The NUMBER of protons and thus nuclear charge in Na+ is more than Ne. So, the nuclear ATTRACTION on the valence electrons is more in Na+ than Ne. Thus, Na+ has higher value of ionization enthalpy than Ne.

lectric POINT the nature is zwitter ionic IE. NEUTRAL Pk1 +pk2 /2 5.97

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tion:In chemistry, the empirical FORMULA of a CHEMICAL compound is the simplest positive integer ratio of atoms present in a compound. A simple example of this concept is that the empirical formula of SULFUR monoxide, or SO, WOULD simply beSO, as is the empirical formula of disulfur DIOXIDE, S2O2.

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oxides show neither basic nor acidic properties and hence do not FORM salts when reacted with acids or BASES, e.g., carbon MONOXIDE (CO); NITROUS oxide (N2O); nitric oxide (NO), etc., are NEUTRAL oxides.

Explanation:When soap is added to an oily or greasy PART of cloth, the hydrocarbon part of soap DISSOLVES in oil, keeping the HEAD away from the oil. BIG molecules of oil and soap BREAK by rubbing into small emulsified oil droplets in water, which are washed away by stream of water.

Formula MASS is defined as the sum of atomic MASSES of the ions PRESENT in the formula UNIT of an ionic COMPOUND while molecular mass is the sum of the atomic masses of the atoms in a molecule.

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because it's a NEGATIVE COMPOUND so it will not FORM +3 IONS

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CarbonAnswer: (i) Carbon has the highest first ionisation enthalpy AMONG the elements B, Al, C and Si. The first ionisation enthalpy of C is more than B on account of higher NUCLEAR CHARGE. B and Al belong to the same GROUP and B has higher value than Al as it is smaller in size.Explanation:

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