Matter in Our S...

The Kinetic Molecular Theory gives postulates that define matter and help to understand its properties. From the options provided below, select the one that is not a characteristic of matter.

What is the reason that sugar crystals when added to water dissolve on stirring, but the same does not happen in case of a stone?

Which of the following has the highest kinetic energy?

Under which of the following conditions will the particles present in a crystal of copper sulphate take the least time for intermixing with the particles of water?

What does the melting point of a solid indicate?

Which of the following particles will have the highest energy?

I. Particles in water at 0°C
II. Particles in water at 273 K
III. Particles in ice at 0°C
IV. Particles in ice at 273 K

Early Indian and Greek philosophers classified matter

Which of the following statements is true about evaporation?

Ice floats on water because

Why does an inflated balloon burst with a sound when it is pricked with a needle?

What is the value of latent heat of fusion for ice?

A liquid kept in an open vessel undergoes evaporation. The particles of liquid absorb energy from surroundings to regain the energy lost during evaporation. This absorption of energy from the surroundings results in

(i) an increase in the temperature of the surroundings
(ii) a decrease in the temperature of the surroundings
(iii) no change in the temperature of the surroundings
(iv) an increase/a decrease in the temperature of the surroundings depending upon the nature of the liquid

Which of the above points is/are is correct?

In which of the following cases is the rate of cooking very slow?

The following question consists of an Assertion (A) and a Reason (R). Read both statements carefully and mark the appropriate option.

(A) Assertion: Ice in a perfectly insulated thermos flask will melt when brought from hills to the plains.
(R) Reason: The freezing point is lower at sea level than at higher altitudes.

Substances that sublime

The working of a syringe is based on

Which sample at S.T.P. has same number of molecules as 5 L of NO₂ (g) has at S.T.P?

At a constant temperature, in a cylinder-piston arrangement, if the pressure is increased by a factor of 3, then what is the percentage decrease in the volume?

Which of the following substances is known as 'dry ice'?

The fixed temperature at which the solid and liquid states of a substance exist in equilibrium under 1 atm pressure is called