Duduli

Answer:- Electrostatic force of attraction between hydrogen atom of one molecule and a highly electronegative element (such as F, O & N) present within the same molecule or another molecule of the same or different compounds is known as hydrogen bonding.In water their exist hydrogen bonds.

Answer:- The force of attraction between the molecules of different substances are called adhesive force. e.g writing on blackboard by chalk is possible due to adhesive force between molecules of chalk and blackboard.

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Answer:- The molecule in which the central atom belongs from 3rd to 6th period element and their is atleast one lonepair of electron on cental atom then that molecule is called Dragoes molecule.  e.g AsF3, Here As(Arsenic) belongs to 4th period element and their is also a lone pair of electron on arsenic atom.so it is a Dragoes molecule.

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Answer:- A chemical equation which includes the heat changes taking place during a chemical reaction is called the Thermochemical equations.

Answer:- The phase is that physical quantity which represents the instantaneous displacement and direction of motion of a vibrating particle.

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Answer:- A point where the whole of the weight of a  body is supposed to be acting, is  called centre of gravity. Centre of gravity & centre of mass may be coincident.

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Answer:- Centre of a mass of a body is defined as a single point where whole of the mass of the body is supposed to be concentrated and which behaves in similar manner to external forces as the body would have behaved.It may lie outside the body.

Answer:- A rigid body consists of a number of particles confined to a fixed geometrical shape and size in such a way that the distance between any pair of particles always remains constant.

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Answer:- The enthalpy change during a chemical reaction is the same whether a reaction takes place in one or in several steps.

Answer:- Every two material particles of universe attract each other and this force of attraction is directly proportional to the product of masses of particles and inversely proportional to the square of the distance between them. I.e

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Answer:- A process is said to be Isochoric if the volume of the system remains constant during each step of the process.

Answer:- The physical quantity which tends to rotate the body about an axis due to an external force acting on it is called torque.It is a vector quantity.Its magnitude is equal to product of force & perpendicular displacement.And its direction is perpendicular to the plane containing the force and perpendicular displacement.

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Answer:- It is the tendency of an atom in a molecule to attract the shared pair of electrons towards itself.It is the property of a bonded atom.Fluorine is the most electronegative whereas cesium is the least electronegative element in the whole periodic table.

Explanation:- When a bullet is fired from a gun, the gun recoils back.The reason is that the gun exerts an action force on bullet in forward direction,the bullet also exerts an equal and opposite reaction force as gun.As a result the gun recoils in backward direction.The gun-man feels a backward jerk.

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Answer:- If vector is resolved into two or more vectors whose combined effect is same as that of the given vector,then the resolved vectors are called the components of the given vector.This is called resolution of vector.The resolution of a vector is opposite to that of vector addition.

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Statement:- Under similar conditions of temperature and pressure the rates of diffusion of gases are inversely proportional to the square root of their densities.

Answer:- Centripetal force is that external force which deflects a particle from its linear path to make it moves along a circle and is always directed radially inwards.

Statement:- When two or more chemically inert gases are enclosed in a vessel or allowed to intermix at constant temperature, the pressure exerted by the mixture of gases will be equal to the sum of the partial pressures which each gas exerts on the vessel.

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Answer:- In summer the room temperature is much higher as compared to winter. Consequently,the same volume of air will exert greater pressure in summer than in winter.(because according to Lussac's law at constant volume, pressure directly proportional to temperature 🌡️).Therefore to avoid the bursting of tyres it is always advisable.

Answer:- Initially the ball is moving with a certain velocity and the player has to apply a retarding force to bring the ball to rest in his hand.In this case ∆t→0 so a large force exerted by the ball upon the hands of player.But if he moves his hands backward then he provide a greater time for change in momentum.Thus a small force is exerted by the ball upon the hands.

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Answer:- The zeroth law of thermodynamics states that if two thermodynamic system each in thermal equilibrium with a third system,then they are in thermal equilibrium with each other. According to this law   If Temperature of A = Temperature of C  & Temperature of B = Temperature of C then, Temperature of A=Temperature of B

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Answer:- A reaction in which oxidation (loss of electron) & reduction(gain of electron) occur simultaneously is called redox reaction. e.g

Answer:- Angular velocity is the angle described by a rotating body per unit time.It is a vector quantity. And is denoted by w(omega)

Answer:- Inertia is the inherent (internal)  property of the body which opposes any change in its state of rest or uniform motion in a straight line. The name inertia was given by Galileo. It is of three types, (I) Inertia of rest (II) Inertia of motion (III) Inertia of direction

Answer:- Quantum numbers are index(whole no.) numbers which are used to specify the position and energy of an electron in an atom.It provide detailed address of an electron in an atom.It is are of four types (I) principle Quantum numbers           (II) Azimuthal Quantum numbers           (III) Magnetic Quantum numbers           (IV) Spin Quantum numbers

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Answer:- The impulse of a force may be defined as the product of the average force and the duration of impact. I.e Impulse (I)=average force × time       I=Fdt or I=dp  dp=change in momentum

Answer:- A body which emits & absorbs radiations of all frequencies uniformly, is called a black body & the radiation emitted by such a body is called black body radiation.That body is ideal body.

ANSWER:- It states that a chemical compound always contains it's component elements in a fixed ratio it does not change with change in their source and their methods of preparation.

ANSWER:- It is a vector which gives the position of a point with reference to a point other than the origin of the coordinate system. ★The magnitude of displacement vector called distance formula.

Answer:- The reagent (or reactant) which is consume first in a chemical reaction is called limiting reagent. ★The limiting reagent stops the chemical reaction and no further products are formed.

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Answer:- Halogens are have small size with high nuclear charge as a concequence they rapidly accept one electron to attain noble gas configuration.Therefore halogens are have maximum negative gain enthalpy.

Explanation:- When bird flies it strikes the air with its wings,air also exerts a reaction force on bird's wings in opposite direction(by Newton's 3rd law). Look at the figure, in which these reaction forces are represented by ON1 & ON2.The resultant of ON1 & ON2 is ON. It is the net upward force which causes the bird to fly.

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Answer:- When phenoxide ion(more electophilc than phenol) undergoes electrophilic substitution with carbon dioxide(weak electophile)ortho hydroxybenzoic acid is formed. This reaction is called Koble's reaction.

Answer:- A rectifier is a semiconductor device which convert alternating current into direct current. ★It is of two types,                  (i) Half wave rectifier                  (ii) Full wave rectifier

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