Complete guide to "Matter In Our Surroundings" for Chemistry students. Below you will find important questions and model answers to help you prepare.
We are building a dedicated quiz for this topic, but you can test your skills on a similar concept: The Fundamental Unit of Life - NCERT Class 9 Practice Set 1.
Which one of the following sets of phenomena would increase on raising the temperature?
Diffusion, evaporation, compression of gases
Evaporation, compression of gases, solubility
Evaporation, diffusion, expansion of gases
Evaporation, solubility, diffusion, compression of gases
Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions
Low temperature, low pressure
High temperature, low pressure
Low temperature, high pressure
High temperature, high pressure
The property to flow is unique to fluids. Which one of the following statements is correct?
Only gases behave like fluids
Gases and solids behave like fluids
Gases and liquids behave like fluids
Only liquids are fluids
During summer, water kept in an earthen pot becomes cool because of the phenomenon of
diffusion
transpiration
osmosis
evaporation
A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents a correct arrangement?
Water, air, wind
Air, sugar, oil
Oxygen, water, sugar
Salt, juice, air
On converting 25°C, 38°C and 66°C to kelvin scale, the correct sequence of temperature will be
298 K, 311 K and 339 K
298 K, 300 K and 338 K
273 K, 278 K and 543 K
298 K, 310 K and 338 K
Choose the correct statement of the following
conversion of solid into vapours without passing through the liquid state is called sublimation.
conversion of vapours into solid without passing through the liquid state is called deposition.
conversion of vapours into solid without passing through the liquid state is called freezing.
conversion of solid into liquid is called sublimation.
The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C respectively. Which one of the following correctly represents their boiling points in kelvin scale?
306 K, 329 K, 391 K
308 K, 329 K, 392 K
308 K, 329 K, 391 K
329 K, 392 K, 308 K
Which condition out of the following will increase the evaporation of water?
Increase in temperature of water
Decrease in temperature of water
Less exposed surface area of water
Adding common salt to water
In which of the following conditions, the distance between the molecules of hydrogen gas would increase? (i) Increasing pressure on hydrogen contained in a closed container (ii) Some hydrogen gas leaking out of the container (iii) Increasing the volume of the container of hydrogen gas (iv) Adding more hydrogen gas to the container without increasing the volume of the container
(i) and (iii)
(i) and (iv)
(ii) and (iii)
(ii) and (iv)