#A hot plate of an electric oven connected to a 220 V line has two resistance coilsA and B, each of

#Show how you would connect three resistors, each of resistance 6 Ω, so that

#A copper wire has diameter 0.5 mm and resistivity of 1.6 × 10–8 Ω m. What will bethe length of this

#A piece of wire of resistance R is cut into five equal parts. These parts are thenconnected in

#structure and function of nephron #different process involved in nephron #class10science #lifeproce

A bullet of mass 0.04 kgmoving with a speed of 90 m s–1 enters aheavy wooden block and is stoppe

A motorboat is racingtowards north at 25 km/h and the watercurrent in that region is 10 km/h in

Rain is falling vertically witha speed of 35 m s–1. Winds starts blowingafter sometime with a speed

A ball is dropped from a height of 90 m on a floor. At each collision with the floor,the ball loses

#A woman starts from her home at 9.00 am, walks with a speed of 5 km h–1on astraight road up to he

A car moving along a straight highway with speed of 126 km h–1is brought to astop within a distance

The distances traversed, duringequal intervalsof time, by a body fallingfrom rest, stand to one anot

A ball is thrown verticallyupwards with a velocity of 20 m s–1fromthe top of a multistorey

The position of an objectmoving along x-axis is given by x = a + bt2where a = 8.5 m, b = 2.5 m s–2

#time of flight and maximum height of projectile #motioninplane #motioninplane #motioninastraightlin

#An object 5 cm in length is held 25 cm away from a converging lens of focal length10 cm. Draw the

#A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is

#Projectile motion #Maximum Height#Time of flight#Maximum Horizontal Range

3.27 The rate constant for the first order decomposition of H2O2is given by thefollowing equation

3.12 The reaction between A and B is first order with respect to A and zero orderwith respect to B.

3.11 The following results have been obtained during the kinetic studies of the reaction:2A + B

3.10 In a reaction between A and B, the initial rate of reaction (r0) was measuredfor different ini

The decomposition of A into product has value ofkas 4.5×103s–1at 10°Cand energy of activation 60 kJ

The rate of a reaction quadruples when the temperature changes from293 K to 313 K.

#Derivation of Arrhenius equation

#role of Ph change in everyday life #acidsbasesandsaltsclass10 #class10science

#role of Ph change in everyday life #acidsbasesandsaltsclass10 #class10science

#pH change in everyday life

Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm. Calculatethe frequency (ν)

An object 5 cm in length is held 25 cm away from a converging lens of focal length10 cm. Draw the

A convex lens forms a real and inverted image of a needle at a distanceof 50 cm from it. Where

A 2.0 cm tall object is placed perpendicular to the principal axis of aconvex lens of focal length

A concave lens has focal length of 15 cm. At what distance shouldthe object from the lens be placed

Calculate the standard cell potentials of galvanic cell in which the followingreactions take

The cell in which the following reaction occurs:2Fe 3 + ( aq ) + 2I − ( aq ) → 2Fe 2 +( aq ) +I 2

Calculate the equilibrium constant of the reaction:Cu(s) + 2Ag+(aq) → Cu2+(aq) + 2Ag(s)

#Depict the galvanic cell in which the reaction takes place.1 Zn(s)+Cu2+ (aq) Zn2+(aq)+Cu(s).

#Find product of of An aqueous solution AgNO3 with platinum electrodes

#50.0kg of N2(g) and 10kg of H2(g) are mixed to produce NH3(g). Calculate the NH3(g) formed. Identi

Dinitrogen and dihydrogen react with each other to produce ammonia accordingto the following

#A concave mirror produces three times enlarged virtual image of an object placed at 10 cm in front

Permanganate ion reacts with bromide ionin basic medium to give manganesedioxide and bromate ion.

#An object, 4.0 cm in size, is placed at 25.0 cm in front of a concavemirror of focal length 15.0 cm

Which of the following are matter?Chair, air, love, smell, hate, almonds, thought, cold, cold-drink,

Balance the following chemical equations: HNO3+Ca(OH)2→Ca(NO3)2+H2O

If oxidation number of X, Y and Z in a compound are -3, +5 and -1 respectively then possible formula

2.2(ii)Find (a) the total number and (b) the total mass of neutrons in 7 mg of14C.(Assume that mass

2.2(iii) Find (a) the total number and (b) the total mass of protons in 34 mg of NH3

2.2(1)Calculate the total number of electrons present in one mole of methane.

2.1 (ii) Calculate the mass and charge of one mole of electrons.

2.1 (i) Calculate the number of electrons which will together weigh one gram

What will be the mass of one12C atom in g?

Use the data given in the following table to calculate the molar mass of naturallyoccuringargonisot

Calculate the number of atoms in each of the following (i) 52 moles of Ar (ii)52 u of He (iii) 52 g

Calcium carbonate reacts with aqueous HCl to give CaCl2and CO2according to thereaction, CaCO3(s) +

Chlorine is prepared in the laboratory by treating manganese dioxide (MnO2) withaqueous hydrochloric

A welding fuel gas contains carbon and hydrogen only. Burning a small sample of itin oxygen gives

Q17-A sample of drinking water was found to be severely contaminated with chloroform,CHCl3, supposed

Q12-If the density of methanol is 0.793 kg L–1, what is its volume needed for making2.5 L of its 0.2

What is the concentration of sugar (C12H22O11) in mol L–1if its 20 g are dissolved inenough water