Question 1 :
How many triple covalent bonds can a single carbon atom form at a time?
Question 9 :
The organic compounds having double or triple bond(s) in them are termed as ________________.
Question 11 :
Which of the following is not an allotropic form of carbon?
Question 13 :
How many double covalent bonds can a single carbon atom form at a time?
Question 16 :
The substance which is expected to have the highest ignition temperature out of the following is _________.<br/>
Question 18 :
If X is a non-metal. It will not conduct electricity unless it is carbon in the form of :<br/>
Question 19 :
Assertion: <span>Carbon is nonmetal.</span><br/>
Reason: <span>Carbon atoms can bond with each other.</span>
Question 24 :
If X is a non-metal, it will not conduct electricity unless it is carbon in the form of __________.
Question 25 :
All allotropes of carbon exist in ___________ state at room temperature.
Question 27 :
Which of the following constituents of coal is the most important in production of coke?
Question 29 :
Compounds of carbon and hydrogen which form long chains or branched chains are:
Question 30 :
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 31 :
On which of the following content of coke, its price depend?
Question 36 : <div><span>The phenomenon of existence of an element in more than one physical form is called allotropy.</span><br/></div>
Question 38 :
<span>Which form of coal is a highly effective absorbent for fuel and oil spills on land and water. It is also used as a conditioner for soil to make it more able to retain and slowly release water?</span>
Question 39 :
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 41 :
Which of the following statements is/are incorrect for diamond?<br/>(a) The refractive index of diamond is highest among solids.<br/>(b) Diamond is hard because all the valence electrons of each carbon atom are involved in bond formation.<br/>(c) Diamond is thermodynamically more stable than graphite.<br/>(d) <span>One carat of diamond represents its weight.</span>
Question 44 :
Which of the following is a monounsaturated hydrocarbon, i.e. the compound that contains one carbon - carbon double bond?
Question 47 :
The carbon atoms in diamond are bonded to each other by:
Question 48 :
Which coal is the generally the primary source of coke production?
Question 50 :
The number of free electrons in the outermost shell of carbon in graphite is:
Question 53 :
Graphite is used as a lubricant in machines because it has a very high melting point and also it :
Question 56 :
Which of the following does not decolourise bromine solution in carbon disulphide
Question 62 :
<span>What percent of the carbon content is present in Bituminous coal?</span>
Question 65 :
Assertion: Diamond and graphite are allotropes of carbon
Reason: Some elements can have several different structural forms while in the same physical state. These differing forms are called allotropes.
Question 67 :
The gas produced by the passage of air over hot coke is :
Question 68 :
From the below given options, which one is not a type of coal?
Question 73 :
Coal, ________ and _________ are the conventional sources for Thermal power in India.
Question 74 :
An alkyl bromide, $RBr$ of molecular weight $151$ is the exclusive product of bromination of which hydrocarbon?
Question 76 :
<span>Petrol consists of hydrocarbons majorily from $ C_{12}H_{26} $ to $ C_{15}H_{32}.$</span>
Question 78 :
A hydrocarbon having molecular formula $C_8H_{16}$ absorbed no hydrogen during hydrogenation.The hydrocarbon is<span>?</span>
Question 81 : The degree of unsaturation in the given compound is:<br/>1) $C_3H_3Cl_3$ <div>2) $C_3H_4O$</div><div>3) $C_4H_5N$</div>
Question 82 :
The most common fullerene is $C_{60}$. 60 C-atoms are arranged in ______ pentagons and ______ hexagons.<br/>
Question 84 : Match the List I and List II and select the correct answer the code given below the list<br><table class="wysiwyg-table"><tbody><tr><td>List I</td><td>List II</td></tr><tr><td>1. ${C}_{n}{H}_{2n}$</td><td>(A) ethers</td></tr><tr><td>2. ${C}_{n}{H}_{2n-2}$</td><td>(B) alkenes, cycloalkanes</td></tr><tr><td>3. ${C}_{n}{H}_{2n+2}O$</td><td>(C) aldehydes, ketones</td></tr><tr><td>4. ${C}_{n}{H}_{2n}O$</td><td>(D) alkynes, alkanienes</td></tr></tbody></table>Codes:
Question 87 :
Fullerene is an allotrope of carbon which is similar to a football. It 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 $C_{75}$ are the members of the fullerene family. But $C_{60}$ (pronounced as C sixty) is the most stable and most studied form of fullerenes. What do you think is the nature of the bond which is joining these atoms together?
Question 88 :
What percent of the carbon content is present in Anthracite coal?
Question 89 :
The residue left behind after the dry distillation of coal _____________.
Question 92 :
Some elements show the property of existing in two or more distinct physical form which shows different physical properties but same chemical properties. These distinct forms of an element are called:
Question 93 :
<span>Who has synthesised the organic compound 'urea' for the first time?</span>
Question 96 :
In the Earth's crust, Carbon is found in the form of_________.
Question 98 :
Identify the unsaturated compounds from the following :<br/>(i) Propane<br/>(ii) Propene<br/>(iii) Propyne<br/>(iv) Chloropropane<br/>
Question 99 :
In which of the given pairs the two compounds are allotropes of the same element?
Question 100 :
Consider the following statements : A hydrocarbon of molecular formula $C_{5}H_{10}$ is a:<br>I. monosubstituted alkene<br>II. disubstituted alkene<br>III. trisubstituted alkene
Question 101 :
Using the given hints, identify the option with correct coal product and its use.<br/>(1)$\;\;$Almost pure form of carbon.<br/>
Question 105 :
A mono-acid organic base gave the following results on analysis. C = 78.6% H = 84% N = 13%. 0.4 gm of the platinic chloride left on ignition 0.125 gm of pt. The molecular formula of the base is:<span><br/></span>
Question 106 :
How many hydrogen atoms would you expect to find in a saturated hydrocarbon with 7 carbon atoms?
