Question 1 :
The distance between the centre of a nucleus and the outermost orbit of the atoms is called__________.

Question 3 :
The early attempt to classify elements as metals and non-metals was made by :

Question 10 :
The element with atomic number $14$ is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?

Question 11 :
Which of the following is a correct statement about metallic atoms?

Question 12 :
What is the Trends of Variation of atomic radius along a period?

Question 14 :
Most metallic element has the following electron&#160;arrangement in its atom is<span>&#160;:</span><br/>

Question 16 :
The distance between the centre of nucleus and the outermost shell of an isolated atom is known as<span>&#160;:</span>

Question 18 :
Nuclear charge increases both in a period and group. But, effective nuclear charge increases in a period and decreases in a group. Identify the correct reverse trend.

Question 23 :
Compare the radii of two species X and Y.<br/>(a) X has 12 protons and 12 electrons.<br/>(b) Y has 12 protons and 10 electrons.<br/>

Question 26 :
The long form of the periodic table consists of ___ horizontal rows and ___vertical columns.

Question 28 :
Which of the following is a correct statement about non-metallic atoms?

Question 32 :
<div>The number of electrons in the valence shell of group 1 elements.</div>

Question 34 :
Which of the following group of elements has the same size?

Question 35 :
Which of the following has metallic as well as non-metallic character?<div><br/>(i) Arsenic (ii) Antimony&#160;(iii)&#160;<span>Lead</span></div>

Question 36 :
<div><span>An element $X$ (atomic number $17$) reacts with an element $Y$ (atomic&#160;number $20$) to form a divalent halide.</span><br/></div><div><span><br/></span></div>Element X is :&#160;<br/>

Question 42 :
In which of the following arrangements, the order is not correct according to the property indicated against it?

Question 44 :
The ground state electronic configurations of the elements, U, V, W, X and Y (these symbols&nbsp; do not have&nbsp;any chemical significance) are as follows:<br>U&nbsp; &nbsp;$1s^2 2s^2 2p^3$&nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;V $1s^2 2s^2 2p^6 3s^1$<br>W&nbsp; $1s^2 2s^2 2p^6 3 s^2 3p^2$&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp;X $1 s^2 2s^2 2 p^6 3s^2 3p^6 3d^5 4s^2$<br>Y $1 s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4 p^6$<br>Determine which sequence of elements satisfy the following statements:<br>(i) Element forms a carbonate which is not decomposed by heating<br>(ii) Element is most likely to form coloured ionic compounds<br>(iii) Element has largest atomic radius<br>(iv) Element forms only acidic oxide

Question 45 :
Out of $Fe^{2+}, Fe^{3+}, Mn^{2+}$ and $Ti^{2+}$, the least size is of:

Question 46 :
<span>Which of the following order of ionic radii is correctly represented?</span><br/>

Question 47 :
<div><span>Name the element with the biggest atomic radius of the following:</span><br/></div>

Question 49 :
Arrange the following elements in the order of their increasing non-metallic character:<div><br/>Li, Be, C, O, F<br/></div>

Question 50 :
Which of the following choices both show the correct order of elements by increasing atomic radius AND by increasing ionization energy?

Question 51 :
<SPAN>Based on general trends in the periodic table, predict which element in each of the following pairs has the most metallic character.<BR>(i) Sn or Pb&nbsp;&nbsp; &nbsp;(ii) Ag or Sr&nbsp;&nbsp; &nbsp;(iii) Al or B&nbsp;&nbsp; &nbsp;(iv) Br or As</SPAN>

Question 52 :
Which one of the following is correct order of increase of size:

Question 53 :
The correct order for decreasing atomic radius of the five atoms $H,\ Br,\ I,\ He$ and $S$ is :

Question 54 :
The correct sequence which shows decreasing order of the ionic radii of the elements is:&#160;

Question 55 :
If the nucleus $_{13}^{27}Al$&nbsp; has a nuclear radius of about 3.6 fm, the $_{52}^{125}$Te would have its radius approximately as:<br>

Question 56 :
$\displaystyle 2Al\left( s \right) +6HCl\left( aq \right) \rightarrow 2{ Al }^{ 3+ }\left( aq \right) +6{ Cl }^{ - }\left( aq \right) +3{ H }_{ 2 }\left( g \right)&#160;$<br/>&#160;The reaction above is best described as a(an):<br/>

Question 57 :
Formation of nitric oxide from nitrogen and oxygen is a ______ reaction.

Question 61 :
$Zn + xHCl \rightarrow ZnCl_2 + A$<br/>In above equation A and x are :

Question 62 :
On passing excess $CO_2$ in aqueous solution of sodium&#160;carbonate, the substance obtained is :

Question 65 :
Which of the following are exothermic processes?<br>(i) Reaction of water with quicklime<br>(ii) Dilution of an acid<br>(iii) Evaporation of water<br>(iv) Sublimation of camphor (crystals)<br>

Question 66 :
The reaction of nitrogen with oxygen to form nitric oxide is :<br/>

Question 67 :
The phenomenon of formation of simple sugar from starch in our body is the example of which reaction?&#160;

Question 69 :
The formation of a larger chemical from the smaller components is known as&#160;<br/>

Question 70 :
Which of the following reactions is/are a double displacement reaction(s) ?<br/>(i) $AgNO_3 + NaBr\, \rightarrow\, NaNO_3\, +\, AgBr$<br/>(ii) $BaCl_2 + H_2SO_4\, \rightarrow\, BaSO_4\, +\, 2HCl$<br/>(iii) $AgNO_3\ + &#160;NaCl\, \rightarrow AgCl +\ NaNO_3$<br/>(iv) $NaOH\, +\, HCl\,\rightarrow\, NaCl\, +\, H_2O$

Question 74 :
Solid calcium oxide reacts vigorously with water to form calcium&nbsp;hydroxide accompanied by the liberation of heat. This process is&nbsp;called slaking of lime. Calcium hydroxide dissolves in water to&nbsp;form its solution called lime water. Which among the following is&nbsp;(are) true about slaking of lime and the solution formed?<br>(i) It is an endothermic reaction.<br>(ii) It is an exothermic reaction.<br>(iii) The pH of the resulting solution will be more than seven.<br>(iv) The pH of the resulting solution will be less than seven.<br>

Question 77 :
$CaC{ O }_{ 3 }\xrightarrow { \quad \quad \Delta \quad \quad &#160;} CaO+C{ O }_{ 2 }\uparrow $ is a ________ reaction.

Question 79 :
If copper is kept open in air, it slowly loses its shining brown surface&#160;and gains a green coating. It is due to the formation of:<br/>

Question 80 :
Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Which among the following is (are) true about slaking of lime?<br>(i) It is an endothermic reaction<br>(ii) It is an exothermic reaction<br>(iii) The pH of the resulting solution will be more than seven<br>(iv) The pH of the resulting solution will be less than seven<br>

Question 81 :
Magnesium ribbon is burnt in an atmosphere of nitrogen gas&#160;to form solid magnesium nitride. This is a :<br/>

Question 82 :
Decomposition of nitrogen pentoxide ${N}_{2}{O}_{5}$ in $C{Cl}_{4}$ is a ______ reaction

Question 83 :
$2H_2S + SO_2 \rightarrow 3S + 2H_2O$<div><br/>In the above reaction:<br/>(a) $H_2S$ gets oxidized.<br/>(b) $SO_2$ gets reduced.<br/>(c) $H_2S$ gets reduced.<br/><span>(d) $SO_2$ gets oxidized.</span></div>

Question 84 :
<div><span>Nitrogen gas is treated with hydrogen gas in the presence of a&#160;catalyst at 773K to form ammonia gas. This reaction is an example of:</span><br/></div>

Question 86 :
Reaction of iron nail with copper sulphate solution is ___________ reaction.

Question 87 :
The reaction between carbon and oxygen can be represented as:<br/>$C(g)\ + \ O_2(g)\rightarrow CO_{2}(g) + heat$<br/>In which of the following type(s), the above reaction can be classified?<br/>I. Combustion reaction<br/>II. Displacement reaction&#160;<br/>Ill. Endothermic reaction<br/>IV. Combination reaction<br/>

Question 88 :
$ 4Fe + 3O_2 \rightarrow 2Fe_2O_3 $<br/>Which is the oxidising agent in the above reaction?

Question 89 :
The reaction in which two compounds exchange their ions to form two new compounds is called:

Question 91 :
In the double displacement reaction between aqueous potassium&nbsp;iodide and aqueous lead nitrate, a yellow precipitate of lead iodide&nbsp;is formed. While performing the activity if lead nitrate is not&nbsp;available, which of the following can be used in place of lead&nbsp;nitrate?<br>

Question 93 :
The reaction in which the same chemical reacts again and again with the substrate is:

Question 94 :
Three beakers labelled as $A,\ B$ and $C$ each containing 25 mL of water were taken. A small amount of $NaOH$, anhydrous $CuSO_4$ and $NaCl$ were added to the beakers $A,\ B$ and $C$ respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers $A$ and $B$, whereas in case of beaker $C$, the temperature of the solution falls. Which one of the following statement(s) is(are) correct ?<br/>(i) In beakers $A$ and $B$, exothermic process has occurred.<br/>(ii) In beakers $A$ and $B$, endothermic process has occurred.<br/>(iii) In beaker $C$ exothermic process has occurred.<br/>(iv) In beaker $C$ endothermic process has occurred.<br/>

Question 95 :
$Si + C \rightarrow$ SiC. This chemical reaction is an example for:

Question 96 :
When $SO_{2}$ gas is passed into aqueous $Na_{2}CO_{3}$, product formed is&#160;<span>$Na_{2}SO_{3}$, the type of the reaction is :</span>

Question 97 :
You mix two colourless solutions and the resulting mixture becomes cloudy. What type of reaction is observed?

Question 101 :
Identify the type of the reaction.<div>Potassium + Iron oxide $\rightarrow$ Potassium oxide + Iron</div>

Question 105 :
Copper sulphate solution, which is blue in colour, will change to a colourless solution with<span>&#160;the addition of which metal</span>?

Question 106 :
<span>Match the following:</span><div><br/><table class="wysiwyg-table"><tbody><tr><td>Column A<br/>Types of chemical&#160;reaction<br/></td><td>Column B<br/>Chemical equations<br/><br/></td></tr><tr><td>(a)&#160;Combination reaction</td><td>(i) $CaCO_3\,&#160;\overset{A}{\rightarrow}\, CaO\, +\, CO_2$</td></tr><tr><td>(b)&#160;Decomposition reaction</td><td>(ii) $2H_2O\,&#160;\xrightarrow{Electricity}\, 2H_2\, +\, O_2$</td></tr><tr><td>(c)&#160;Displacement reaction</td><td>(iii) $CaO\, +\, CO_2\, \rightarrow\, CaCO_3$</td></tr><tr><td>(d) Analysis reaction</td><td>(iv) $Fe(s)\, +\, CuSO_4(aq.)\, \rightarrow\, FeSO_4\, (aq)\, +\, Cu(s)$</td></tr></tbody></table></div>