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Question 2 :
If X is a non-metal, it will not conduct electricity unless it is carbon in the form of __________.

Question 5 :
The substance which is expected to have the highest ignition temperature out of the following is _________.<br/>

Question 6 :
If X is a non-metal. It will not conduct electricity unless it is carbon in the form of :<br/>

Question 7 :
<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 8 :
Which of the following constituents of coal is the most important in production of coke?

Question 11 :
The organic compounds having double or triple bond(s) in them are termed as ________________.

Question 12 :
All allotropes of carbon exist in ___________ state at room temperature.

Question 13 :
Which of the following is not an allotropic form of carbon?

Question 23 :
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 24 :
<div><span>The phenomenon of existence of an element in more than one physical form is called allotropy.</span><br/></div>

Question 26 :
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 28 :
Compounds of carbon and hydrogen which form long chains or branched chains are:

Question 30 :
The carbon atoms in diamond are bonded to each other by:

Question 32 :
Which of the following is a monounsaturated hydrocarbon, i.e. the compound that contains one carbon - carbon double bond?

Question 34 :
A hydrocarbon contains all the three of H atoms, i.e., 1, 2, and 3. The relative ratios of abstraction of ................... H atoms are 5.0 : 3.8 : 1.0.

Question 36 :
Which form of the coal produces more greenhouse gases if it undergoes combustion?

Question 40 :
The gas produced by the passage of air over hot coke is :

Question 42 :
<span>Who has synthesised the organic compound 'urea' for the first time?</span>

Question 44 :
Graphite is used as a lubricant in machines because it has a very high melting point and also it :

Question 45 :
Assertion: Carbon and its compounds used as fuels for most applications. Reason: When carbon is heated in presence of excess of air or oxygen, it forms carbon dioxide. During its formation, a large amount of heat and light are released. Further, once ignited, carbon and its compounds keep on burning without needing additional heat energy.

Question 46 :
Information about four hydrocarbons is shown.<br><table class="wysiwyg-table"><tbody><tr><td>hydrocarbon</td><td>number of carbon atoms<br>in the molecules</td><td>reaction with bromine<br>water</td></tr><tr><td>W</td><td>1</td><td>no reaction</td></tr><tr><td>X</td><td>2</td><td>no reaction</td></tr><tr><td>Y</td><td>3</td><td>decolourises it</td></tr><tr><td>Z</td><td>4</td><td>decolourises it</td></tr></tbody></table>Which statement is correct?

Question 47 :
The finest quality coal with the highest carbon content is ______.

Question 49 :
Coal, ________ and _________ are the conventional sources for Thermal power in India.

Question 50 :
A solid fuel formed by heating coal in the absence of air is:

Question 51 :
The allotrope of carbon which is a good conductor of heat and electricity is:

Question 55 :
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 57 :
Using the given hints, identify the option with correct coal product and its use.<br/>(1)$\;\;$Almost pure form of carbon.<br/>

Question 58 :
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 60 :
How many hydrogen atoms would you expect to find in a saturated hydrocarbon with 7 carbon atoms?