Question 3 :
<div>Write 'true' or 'false' against the following statement.    </div><div>Rusting of iron is a chemical change.<br/></div><br/>
Question 5 :
Pressure remaining constant, the volume of a fixed mass of a gas is directly proportional to its absolute temperature. This law is popularly known as :
Question 6 :
Which of the following gases is LEAST dense when all are measured under the same conditions?
Question 7 :
<div>Write 'true' or 'false' against the following statement.    </div><div>Earthquake is a desirable change.<br/></div>
Question 9 :
Solids which are formed by slow cooling will tend to be ________, while solids which are frozen rapidly are more likely to be _________ .
Question 11 :
<div>Write 'true' or 'false' against the following statement.         <br/></div><div>In a chemical change, rearrangement of molecules and atoms involves some energy changes.<br/></div><div></div><br/>
Question 12 :
<div>Choose the most appropriate answer:     </div><div>Rising and setting of the sun at a given place is a <br/></div>
Question 16 :
<div>Write 'true' or 'false' against the following statement.       <br/></div><div>During a physical change energy is neither given out or absorbed by the system.<br/></div><div></div><br/>
Question 20 :
The weakest interparticle forces are found in which of the following?
Question 21 :
<div>Write 'true' or 'false' against the following statement.       <br/></div><div>Cutting of paper into pieces is a chemical change.</div><div></div>
Question 22 :
Pressure of a gas mixture of air is measured by ____________.
Question 23 :
<div>Write 'true' or 'false' against the following statement.        <br/></div><div>New substances are formed in a chemical change.<br/></div><div></div><br/>
Question 24 :
_________ is used to measure the pressure of liquids and gases.
Question 25 :
As a submarine descends into the deep ocean, the pressure it must withstand increase. At an altitude of $- 700$ meters, the pressure is $50$ atm (atmosphere), and at altitude of $- 900$ meters, the pressure is $70$ atm. For every $10$ meters the submarine descends, the pressure it faces increase by $n$, where $n$ is a constant. What is the value of $n$?
Question 26 :
The fifth state of matter i.e. Bose-Einstein condensate was proved in:
Question 31 :
<div>Write 'true' or 'false' against the following statement.        <br/></div><div>In a physical change no net energy change is involved.<br/></div><div></div><br/>
Question 32 :
A liquid is in equilibrium with its vapour at its boiling point. On the average, the molecules in the two phases have equal:
Question 33 :
Assertion: A vacuum is a space from which almost all gas has been removed.
Reason: A vacuum is produced by pumping out all the air and other gases.<br/><div>Choose the correct option.</div>
Question 35 :
Which of the following condition favours the existence of a substance in the solid state?
Question 36 :
A vessel at $987\ torr$ contains nitrogen, argon, helium, and carbon dioxide gases. The partial pressure of the first three gases are $44.0\ mmHg, 466\ mmHg$, and $220\ mmHg$ respectively.<br>What is the partial pressure of carbon dioxide in atm?
Question 38 :
Barium chloride dissolving in water at room temperature is explained by which of the following forces?
Question 39 :
When two pieces of ice are pressed together they form a single lump. This happens due to __________.
Question 40 :
At given temperature and pressure adsorption of which gas of the following will take place the most?
Question 42 :
A gas $(1g)$ at $4$ bar pressure. If we add $2gm$ of gas $B$ then the total pressure inside the container is $6$ bar. Which of the following is true?
Question 43 :
One litre of gas of mass, $2 g$ at $300 K$ and $1$ atm pressure, the pressure is made $0.75$ atm, at which of the following temperatures will one litre of the same gas have mass of one gram.<br><br>
Question 47 :
Calculate the partial pressure of carbon monoxide from the following :<br>$CaCO_{ 3(s) }\overset { \Delta }{ \longrightarrow } { CaO }_{ (s) }+{ CO }_{ 2 }\uparrow ; { K }_{ p }=8 \times \ { 10 }^{ -2 }$<br>$CO_{ 2(g) }C_{ (s) }\rightarrow { 2CO }_{ (g) }$; ${ K }_{ p }=2$<br>
Question 48 :
A gas occupies a volume of $250$ ml at $745$ mm Hg and $25^{\circ}$C. What additional pressure is required to reduce the gas volume to $200$ ml at the same time?
Question 49 :
The density of $NH_3$ at $30^oC$ and $5$ atm pressure is:<br/>
Question 50 :
Which of the following order of molecular force of attraction given species is incorrect?
Question 51 :
<div>At constant pressure, a sample of helium gas has a volume of $800ml$ at ${27}^{o}C$. Calculate the temperature at which the volume will become $20$% of its initial volume.</div>
Question 53 :
What happens when a crystal structure of NaCl type is pressurized?
Question 55 :
Which of the following statements is correct if the intermolecular forces in liquids $A, B$ and $C$ are in the order $A < B < C$ ?<br/>
Question 57 :
Assertion: The volume of $1$ mole of an ideal gas at $1$ bar pressure at $25^{0}C$ is $24.78$ L<br/>Reason: $1$ bar $=0.987$ atm<br/>
Question 58 :
Which intermolecular force is most responsible for allowing xenon gas to liquify?
Question 60 :
When $CO_{2}(g)$ is passed over red-hot coke it partially gets reduced to $CO(g)$. Upon passing $0.5$ litre of $CO_{2}(g)$ over red-hot coke, the total volume of the gases increased to $700\ mL$. The composition of the gaseous mixture at STP is :
Question 61 :
What volume of decinormal ${ K }_{ 2 }{ Cr }_{ 2 }{ O }_{ 7 }$ solution would be needed to convert 1.19 g of tin to stannic chloride in an acidic medium? (${ A }_{ Sn }\ =\<br/><br/>119$)
Question 62 :
A volume of $190.0$ml of $N_2$ was collected in a jar over water at some temperature, water level inside and outside the jar standing at the same height. If a barometer reads $740$ mm Hg and aqueous tension at the temperature of the experiment is $20$ mm Hg, the volume of the gas at $1$ atm pressure and at the same temperature would be?
Question 63 :
Statement 1 : Ammonia gas, $NH_3$ has a smaller density than argon gas, $Ar$, at $STP$.<br/>Statement 2:  The density of a gas at $STP$ is found by dividing the molar mass by $22.4$ litres.
Question 64 :
Assertion: If the intermolecular attraction between gas molecules in a vessel of fixed volume vanishes at constant temperature, the pressure of gas will increase.
Reason: The speed at which the gas molecules are colliding at the walls will increase on disappearance of attractive forces.
Question 65 :
A mole always represnts for gases , 22.4 litres of volume at $ 0^0 C $ and 1 atmosphere pressure which is known as standard temperature and pressure (STP).
Question 66 :
One litre of a gas weighs 2g at $300K$ and $1$ atm. If the pressure is made $0.75$ atm at what temperature will one litre of the same gas weigh one gram?
Question 67 :
Which one of the following statements is not correct about the three states of matter i.e. solid, liquid and gaseous?<br/>
Question 69 :
Which apparatus can be used to introduce more liquid into a reaction and also serve as a pressure valve?
Question 71 :
A balloon is filled with hydrogen at room temperature. It will burst if pressure exceeds $0.2$ bar. <div>If at $1$ bar pressure the gas occupies $22.7$ L volume up to what volume can the balloon be expanded?</div>
Question 72 :
Assertion: Three states of matter are the result of balance between intermolecular forces and thermal energy of the molecules.
Reason: Intermolecular forces tend to keep the molecules together but thermal energy of molecules tends to keep them apart.
Question 73 :
What volume of $NO_2$ gas at $27^oC$ and $1.0$ atm pressure would be produced?<br/>
Question 74 :
Assertion : $^{50}Ti$ and $^{50}Cr$ are isotopes of each other.<br/>Reason : Atoms of $^{50}Ti$ and $^{50}Cr$ have the same mass number. <br/>
Question 75 :
Assertion: Volumes of non-reacting gases are always additive.
Reason: Gases do not have their own volume.
Question 76 :
In which of the following chemical equation, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?
Question 79 :
One litre of a gas is collected at STP. What would be the volume of the same gas at $2$ atmospheric pressure and $27^{\circ}C$:
Question 80 :
One mole of an ideal gas at STP has its temperature changed to $15^{\circ}C$ and its pressure changed to $700\ $ torr. What is the new volume of this gas?<br/>
Question 81 :
A solution of 500 mL of 0.2 M KOH and 500 mL of 0.2 M HCl is mixed and stirred ; the rise in temperature is ${ T }_{ 1 }$. The experiment is repeated using 250 mL each of solution, the temperature rise is ${ T }_{ 2 }$. Which of the following is true ?
Question 83 :
Which of the following order of molecular force of attraction among given species is incorrect ?
Question 84 :
At STP, determine the amount of oxygen in liters that can be prepared from the decomposition of $212$ grams of sodium chlorate($1$ mol$=106$g).
Question 85 :
At STP, a gas that contains $6.02\times 10^{23}$ atoms and it forms diatomic molecules will occupy :
Question 86 :
An open vessel containing air at 27$^o$C is heated to 127$^o$C. The fraction of air originally present in the bottle that is expelled is:
Question 88 :
The force which exists between particle of same kind of substance called cohesion force.
Question 89 :
In a $13L$ vessel initially following reaction occur $C(s)+{S}_{2}(g)\rightleftharpoons {CS}_{2}(g)$ by $12g$ $C$, $64g$ ${S}_{2}$, $76g$ ${CS}_{2}$ at ${1027}^{o}C$ temperature then total pressure is:
Question 90 :
When $2$ g of gas A is introduced into an evacuated flask kept at $25^oC$, the pressure was found to be $1$ atmosphere. If $3$ g of another gas B is then added to the same flask, the pressure becomes $1.5$ atm. Assuming ideal behaviour, the ratio of molecular weights $(M_B:M_A)$ is :
Question 91 :
A gaseous mixture of ethene, ethane and methane having total volume $150\ ml$ is subjected to combustion in excess of oxygen. If percentage of methane in the original mixture is $20\%$ then calculate volume (in ml) of $C{ O }_{ 2 }\left( g \right)$ which will be obtained at same temperature and pressure.
Question 92 :
The gaseous reaction $A_{(g)} \rightarrow 2B_{(g)} + C_{(g)}$ is found to be first order with respect to $A$. If the reaction is started with $p_{A} = 90\ mmHg$, the pressure after $10$ minutes found to be $180\ mmHg$. The rate constant of the reaction is?
Question 93 :
Two liters Duma's bulb contains nitrogen gas at $0.5 atm.$ On adding $0.01\ mol$ of $O_2$ gas it is necessary to cool bulb to a temperature $10^oC$ to maintain the same pressure. The temperature( in Celsius) of Duma's bulb is:
Question 94 :
In the equation of state of an ideal gas $PV = nRT$, the value of universal gas constant would depend only on:
Question 95 :
Pressure of real gas is less than the pressure of ideal gas because:
Question 96 :
The relative strength of interionic/ intermolecular forces in decreasing order is :
Question 97 :
The volume of $HCl$ passed through the solution at ${25}^{o}C$ and $1$ atm is:
Question 99 :
When $2$ g of gas A is introduced into an evacuated flask kept at $25^oC$, the pressure was found to be $1$ atm. If $3$ g of another gas B is then added to the same flask containing A, the pressure becomes $1.5$ atm. Assuming ideal behaviour, the ratio of molecular weights $(M_A:M_B)$ is :
Question 100 :
$0.40\ g$ of helium in a bulb at a temperature of $T\ K$ had a pressure of $p$ atm. When the bulb was immersed in water bath at temperature $50\ K$ more than the first one, $0.08\ g$ of gas had to be removed to restore the original pressure. The temperature $T$ is:
Question 101 :
<p>Consider a classroom that is roughly $5m \times  10m \times  3m.$ Initially $T = 27^{\circ}C$ and $P = 1 atm$. There are $50$ people in an insulated class losing energy to the room at the average rate of $150 watt$ per person. How long can they remain in class if the body temperature is ${42^o}C$ and the person feels uncomfortable above this temperature?</p><p>[Molar heat capacity  of air = $(7/2)R$]<br/></p>
Question 102 :
When a drop of liquid splits up into a number of drops.
Question 103 :
A vessel contains $1.6$ g of dioxygen at STP ($273.15$K, $1$ atm pressure). The gas is now transferred to another vessel at constant temperature, where pressure becomes half of the original pressure. The volume of the new vessel is:
Question 104 :
$0.303$ g of the organic compound in Duma's method on combustion gave $32.27$ ml of moist nitrogen at $27^{\circ}$C and at P mm of Hg pressure. The vapour pressure at $ 27^{\circ}$C is $21$ mm of Hg. Find the value of P.
Question 105 :
Consider a vessel filled with carbodioxide at $27^{\circ}C$ and $5$ atmospheric pressure. A part of the gas is removed at $27^{\circ}C$ and it fills a $3L$ container at $1\ atm$ and the pressure drops to $3.5\ atm$ in the vessel. The volume of the vessel is: