Question 1 : The copper sulphate solution is heated gently on a water bath for :<br/>

Question 2 : Substance is the part of matter.Impure substances are commonly called as:

Question 4 : Used for the preparation of solutions of specific concentrations when a solid is used as the solute _______.<br/>

Question 5 : In the process of crystallisation, crystals formed by different substances :<br/>

Question 6 : Salt dissolves in water to form salt solution. Name of the solvent is:

Question 10 : Substance that is able to get dissolved in solvent is said to be:

Question 12 : The component of the solution that is dissolved in the&#160;solvent is called ?

Question 13 : Crude petroleum has many components that are useful. Which of the following methods is employed to separate the components?

Question 14 : Which of the following method depends upon difference in boiling point?

Question 16 : Two liquids having different boiling point can be seperated by :<br/>

Question 18 : A liquid is contaminated with non-volatile impunities. Suggest method of purification.

Question 21 : The most suitable method of separation of $1$ mixture of ortho and para-nitrophenols is:

Question 22 : Which liquid amongwater or alcohol, has a lower boiling point (and boils first) and can be used in distillation?

Question 24 : Two miscible liquids having different boiling points can be separated by:

Question 25 : The components of an azeotropic solution can be separated by simple distillation.

Question 26 : Separation of two substances by fractional crystallisation depends upon their differences in:

Question 28 : Which of the following is an industrial application of fractional distillation?

Question 30 : At equilibrium, the rate of dissolution of a solid solute in a volatile liquid solvent is:

Question 31 : In fractionating column of fractional distillation, as the column gets higher:

Question 34 : Mark the incorrect statement<br/>&#160; (I) Fractionating column is a long tube.<br/>&#160;(II) Fractionating column is provided with obstructions to the passage of vapours upwards and to the liquids downward.(III) Column itself is fitted with a thermometer.

Question 36 : The principle behind fractional distillation technique&#160;in separation of two liquids is :<br/>

Question 37 : Assertion: The constituents of petroleum can be separated using fractional distillation. Reason: Fractional distillation is a method of separating heterogeneous liquid-liquid mixtures.

Question 38 : Which of the following methods can be used to obtain pure water from a solution of salt in water?

Question 39 : What are the characteristics of the solvent used during purification of copper sulphate by crystallization?

Question 40 : Assertion: Benzene (boiling point $353\ K$) and methanol (boiling point $338\ K$) are separated by simple distillation. Reason: Fractional distillation is used to separate two liquids from their mixture when their boiling points differ by $25^oC$ or less.

Question 43 : During centrifugation, solid particles of the mixture move towards the bottom. True or false?

Question 44 : What type of mixture are separated by the technique of crystallisation ?

Question 46 : You have the mixture of salt, sand and Iodine. Which of these is the best technique to separate these mixtures?

Question 47 : .................. is the change of gaseous state directly to solid state without going through liquid&#160;the state.<br/>

Question 51 : When rectified spirit and benzene are distilled together, the firstfraction obtained is

Question 54 : Assertion: Simple distillation can help in separating a mixture of propan-1-ol (boiling point $97^0C$) and propanone (boiling point $56^0C$). Reason: Liquids with a difference of more than $20^0C$ in their boiling points can be separated by simple distillation.

Question 57 : The volume of a colloidal particle, $V_c$ as compared to volume of solute particle $V_s$ in a true solution could be:

Question 60 : When white light is passed through a colloidal solution containing fine suspended particles of gold, then the scattering light seen in a direction different from that of incident light is:

Question 61 : A mixture of pepper and sand can be dissolved in water. The mixture can be separated by the method ____________.

Question 62 : The process of a liquid changing into vapour is called vapourisation.

Question 66 : The state of matter which has no definite shape or volume is called<br><br>

Question 67 : The water, when left uncovered, gets converted into vapor due to:

Question 68 : Liquids can be poured easily whereas solids cannot be pour because of:

Question 69 : The decreasing order of the intermolecular spaces between particles of states of matter is _________.

Question 72 : Statement: A gas has definite mass but no definite volume and shape.State whether the given statement is true or false.

Question 75 : During hot sunny day, people sprinkle water on the roof because ______________.

Question 77 : _____ are the basic units of matter and the defining structure of elements.

Question 78 : Fill in the blank:<br/>The intermolecular spaces in gases are ..... than&#160;solids.

Question 81 : The phenomenon of change of a liquid into the gaseous state at any&#160;temperature below its boiling point is called :<br/>

Question 83 : State whether true or false :<br/>Sponge is also solid. Yet we are able to compress it.&#160; <br/>

Question 84 : Change of a liquid into vapors at any temperature below its boiling point is called as ______________.

Question 86 : Arrange in the order indicated for solids, liquids and gases:<br>(i) Decreasing order - empty space between<br>(ii) Increasing order - tendency to flow

Question 89 : Choose the correct alternative from the choice given for the following statement:A substance which can not sublime is<br/>

Question 91 : Evaporation of a liquid at room temperature leads to _________ on the liquid surface.<br/>

Question 93 : Assertion: A desert cooler cools better on a hot dry day. Reason: On a hot dry day, the temperature is high and humidity is low. The water takes heat from the hot desert cooler and evaporates. The evaporation of water cools the pads and the circulating water.

Question 94 : During summer season, water kept in an earthen pot becomes cool because of the&#160;phenomenon of :<br/>

Question 95 : While putting clothes for drying up, why dowe spread them out?

Question 96 : Drinking of hot tea from a saucer preferred to a cup, because:

Question 100 : Which one of the following factors do not affect the rate of evaporation?

Question 101 : Assertion: We wear cotton clothes in summer. Reason: The mechanism of our body to keep us cool, during evapourisation the particles at the surface of the liquid gain energy from the surroundings or body surface and change into vapour. The heat energy equal to the latent heat of vapourisation is absorbed from the body leaving the body cool.

Question 104 : An earthenware keeps water cool but metallic vessel does not because __________.

Question 105 : Assertion: It takes longer to dry wet clothes in humid weather. Reason: The presence of humidity in the atmosphere that means water vapour in the atmosphere is already heavy so when we try to dry clothes the evaporation process is slow but effective due to the presence of water vapour in the air.

Question 107 : Assertion: On increasing the surface area of any liquid at constant temperature, the rate of evaporation increases. Reason: Increase in surface area at constant temperature increases the escaping tendency of molecule of liquid at surface.

Question 108 : Assertion: We are able to sip hot tea faster from a saucer than from a cup. Reason: Saucer is having more surface area than a cup, as we know that evaporation is the surface phenomenon. so, the rate of evaporation will increase with the increase in surface area.

Question 112 : Two identical containers, each of volume $V_o$, are joined by a small pipe of negligible volume. The containers contain identical gases at temperature $T_o$ and pressure $P_o$. One container is heated to temperature $2T_o$ while maintaining the other at the same temperature, $T_o$. The common pressure of the gas is P and n is the number of moles of gas in container at temperature $2T_o$, then?

Question 114 : An amount of $1$ mole of a gas is changed from its initial state($20$L, $2$ atm) to final state($4$L, $10$ atm), respectively. If the change can be represented by a straight line in P-V curve, the maximum temperature achieved by the gas in the process is?($R=0.08$L-atm/K-mol)

Question 115 : What is the pressure of gas in the cylinder after $1$ h?

Question 116 : Under what pressure will carbon dioxide have the density of $2.2$ g/litre at $300$K? For $CO_2$, $a=3.6$ atm $l^2 mol^{-2}$ and $b=0.05$ $l-mol^{-1}$.

Question 117 : The pressure exerted on walls of a $3$L flask when $7$g of $N_2$ is introduced into it at $300$K should be?(assume ideal behaviour of gas)

Question 118 : Assertion: Gases become denser at high pressure. Reason: At high pressures, gases deviate from Boyle's law.

Question 119 : Assertion: In a container containing gas A at temperature $ 400\,K $ , some more gas A at temperature $ 400\,K $ is introduced. The pressure of the system increases. Reason: Increase in gaseous particles increases the number of collisions among the molecules , hence the pressure increases .

Question 120 : Burns caused by steam are more severe that burns caused by boiling water.