Question 1 :
<span>In a glass we are having half filled water. Then we are continuously adding salt to the water and salt is getting dissolved into water. But a state occur when water is not able to dissolve salt. Then the solution is called as<b></b> </span>
Question 5 :
An example of colloidal sol in which the affinity of the sol particles for the medium is due to hydrogen bonding is :
Question 6 :
The substance in which solute is dissolved is known as :
Question 11 :
Among the following, name a mixture which is used as a food ?
Question 13 :
A piece of pumice stone is used for scrubbing dirt from hands and feet. Pumice is a colloidal solution of a:
Question 14 :
$100\ ml$ of an aqueous solution contains $6.0\times {10}^{21}$ solute molecules. The solution is diluted to $1$ lit. The number of solute molecules present in $10\ ml$ of the dilute solution is:
Question 15 : Statement: Dissolved particles of a true solution will settle with gravity.<br/><div><br/></div><div>State whether the given statement is true or false.<br/></div>
Question 17 :
What does not affect the rate of dissolution of a solute?<br/>
Question 18 :
The carbon atoms in diamond are bonded to each other by:
Question 19 :
A non-metal $X$ exists in two different forms $Y$ and $Z$. $Y$ is the hardest natural substance whereas $Z$ is a good conductor of electricity. $Y$ is :<br/>
Question 21 : <div><span>The phenomenon of existence of an element in more than one physical form is called allotropy.</span><br/></div>
Question 25 :
Fullerene, an allotrope of carbon, has 60 carbon atoms joined together and no other element in it. There are various types of fullerenes. $C_{60}, C_{70}, C_{74}$ and $C_{78}$ are the members of the fullerene family. Identify the property due to which such large numbers of carbon atoms are joined together in this molecule<span> :</span>
Question 26 :
Which of the following compounds would be a white, crystalline solid?
Question 27 :
If X is a non-metal, it will not conduct electricity unless it is carbon in the form of __________.
Question 28 : <div><span>Statement: Glass is supercooled liquid.</span><br/></div><div><span><br/></span></div><div><span>State whether the given statement is true or false.<br/></span></div>
Question 29 :
Which of the following substances are crystalline allotrope of carbon?<br/>(i) Diamond (ii) Charcoal (iii) Graphite (iv) Lamp black (v) Coke (vi) Fullerene
Question 31 :
Which of the following can conduct electricity in the solid state ?
Question 32 :
Assertion: Quartz glass is crystalline solid and quartz is an amorphous solid.
Reason: Quartz glass has long range order.
Question 35 :
Assertion: $SiC$ has higher melting point than $NaCl.$
Reason: $SiC$ has stronger electrostatic forces of attraction.
Question 36 :
The existence of a substance in more than one solid modifications is known as or any compound having more than two crystal structures is called:
Question 37 :
Which of the following features are not shown by quartz glass?
Question 38 :
Which of the following can conduct electricity in a fused state?
Question 40 :
The melting point of RbBr is $682^\circ C$, while that of NaF is $988^\circ C$. The principal reason that melting point of $NaF$ is much higher than that of $RbBr$ is that :
Question 41 :
The melting point of RbBr is $682^\circ C$, while that of NaF is $988^\circ C$. The principal reason that melting point of $NaF$ is much higher than that of $RbBr$ is that :
Question 43 :
State, whether the following statements are True or False.<br>Thermoplastic polymer is one which softens on heating and becomes hard on cooling.
Question 46 :
As plastics and synthetic fibers consist of repeating monomer units, they are known as ______ .
Question 53 : Statement: The articles made of thermoplastics can be recycled whereas the articles made of thermosetting plastics cannot be recycled.<div><br/></div><div>State whether the given statement is true or false.</div>
Question 58 :
The difference in the densities of low-density (LDP) and high-density polymers (HDP) is due to the fact that:
Question 59 :
Under hydrolytic conditions, the compounds used for preparation of linear polymer and for chain termination respectively are:
Question 61 : The addition polymer which is/are co-polymer are:<div><br/>(i) Neoprene<br/>(ii) Buna-N<br/>(iii) Nylon-$66$<br/>(iv) SBR</div>
Question 62 :
Which one of the following is an example of thermosetting polymers?
Question 63 :
Taking chromium and arsenic, which are toxic, out of pressure-treated wood, and using new less toxic chemicals for bleaching paper, are examples of _________.<br/>
Question 64 :
Chlorofluorocarbons have been in use in refrigerators and air conditioners are proved to be unfriendly to the environment. Substitutes to these compounds which are friendly to the environment are:
Question 65 :
Which of the following gas is used in bleaching of paper?
Question 66 :
_______ is an environment-friendly product and better than halons which are used to extinguish fire.
Question 67 :
A raw material feedstock should be renewable rather than depleting, whenever technically and ecomonically practical, is an objective of:<span><br/></span>
Question 68 :
Nano science deals with the scientific study of objects with sizes in the ____ range in at least one dimension.<br/>
Question 69 :
Materials which have one dimension in the nanoscale (and are extended in the other two dimensions) are:<br/>
Question 72 :
Nanoparticles are the nanomaterials with ____ dimension(s) between 1 nm and 100 nm.<br/>
Question 73 :
Which of the following are the nanomaterials with only one dimension between 1 nm and 100 nm?<br>
Question 74 :
Which of the following practices involve green chemistry?<br>(i) Substitute CFCs by environmental friendly HFCs and other compounds.<br>(ii) Replace halogenated solvent by liquid $CO_{2}$ for drycleaning.<br>(iii) Use of $H_{2}O$ for bleaching instead of $Cl_{2}$<br>(iv) Making disposable eating utensils and storage jars of plastics.
