Question 4 : <p>Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of :</p>
Question 5 :
$FeCl_3 + 3NaOH \rightarrow 3NaCl + Fe(OH)_3$<br/><br/>The reaction is an example of________.
Question 7 :
Identify the type of reaction which will occur based on the information provided about the reactants:<br>${CH}_{4}(g)+{O}_{2}(g)\rightarrow$
Question 9 :
The reaction of hydrochloric acid with zinc oxide to form zinc chloride and water is neutralization reaction. State whether the statement is true or false
Question 10 :
A chemical reaction in which heat is evolved is called a/an:<br/>
Question 11 :
In a change hydrogen peroxide gives rise' to hydrogen oxide and oxygen. This is an example of:
Question 13 :
Four hypothetical metallic elements $A, B, C$ and $D$ forms soluble nitrates having formulae $ANO_3, B(NO_3)_2, CNO_3$ and $D(NO_3)_3$.<br/>Strips of each of the four metals were immersed in $0.1\ M$ aqueous solution of the other metal nitrates, and the following observations recorded.<br/>1. Metal $B$ underwent reaction in all solutions.<br/>2. Metal $A$ only reacted with $CNO_3$.<br/>In order of increasing strength as reducing agents, the metals are :
Question 14 :
When nitrogen reacts with hydrogen under high temperature and pressure to form ammonia gas. This is an example of:
Question 15 :
Give an example of each of the following chemical changes: An endothermic reaction <br/>
Question 16 :
If you pour a few drops of petrol on your palm, it will feel cool as the petrol evaporates. This change a/an:
Question 17 :
In an oxidation process for a cell,<br>$M_1 \rightarrow{ M }_{ 1 }^{ n+ } + ne^- $<br>the other metal $(M_2)$ being univalent showing reduction takes up _____ electrons to complete redox reaction.
Question 18 :
Assertion: When a copper wire is dipped in silver nitrate solution, there is no change in the colour of the solution
Reason: Copper cannot displace silver from its salt solution
Question 19 :
Assertion: Silver metal does not show any change when it is placed in HCl solution.
Reason: Silver metal does not react with dilute HCl.
Question 20 :
The decomposition of $KClO_3$ to $KCI$ and $O_2$ on heating is an example of:
Question 22 :
The solution of bleaching powder in water is always a clear solution.<br/>
Question 24 :
If $H^{+}$ion concentration of a solution is increasedby $10$ times, its $pH$ will :<br>
Question 25 :
$pK_{a}$ of acetic acid is <b>4.741</b>. The concentration of $CH_{3}COONa$ is <b>0.01</b> M. The pH of $CH_{3}COONa$ is?
Question 26 :
The hydrogen ion concentration of the oceans is about $2\times10^{-9}\space M$. What is the $pH$?
Question 28 :
$p{ K }_{ a }$ values of four acids are given below at ${ 25 }^{ o }C$. The strongest acid is:
Question 33 :
$1.0 \ L$ solution is prepared by mixing $61 \ gm$ benzonic acid $(pK_a = 4.2)$ with $72 \ gm$ of sodium benzoate and then $\text{300 mL 1.0 M HBr}$ solution was added. the $pH$ of final solution is:-
Question 35 :
Which colour appears when few drops of phenolphthalein put into test tube contains lime water?
Question 38 :
In which of the following reactions does conc.${ H }_{ 2 }S{ O }_{ 4 }$ act as an oxidising agent?
Question 39 :
When $NH_{3}(0.1\ M) 50\ ml$ mix with $HCl (0.1\ M)\ 10\ ml$ then what is $pH$ of resultant solution $(Pk_{b} = 4.75)$.
Question 42 :
Cacullate the pH of a $0.2M$ solution of strychnine hydrochloride. $\left( p{ K }_{ b }=1\times { 10 }^{ -7 } \right) $
Question 43 :
What is the $pH$ of a solution obtained by mixing $10$mL of $0.1$M $HCl$ and $40$ mL of $0.2$M $H_2SO_4$?
Question 44 :
The $pH$of $0.1\ M$ solution of the following salts increases in the order
Question 45 :
When bleaching powder is dissolved in water, the residue left is :<br/>
Question 46 :
Consider the following statement and select correct option :<br>(l) $K_{sp}$ of $Fe(OH)_3$ in aqueous solution is 3.8 x $10^{38}$ at 298 K. The concentration of $Fe^{3+}$ will increase when $[H^+]$ ion concentration decreases.<br>(ll) In a mixture of $NH_4Cl$ and $NH_4OH$ in water, a further amount of $NH_4Cl$ is added. The pH of the mixture will decreases.<br>(lll) An aqueous solution of each of the following salts $(NH_4l, HCOOK)$ will be basic, acidic respectively.
Question 47 :
Which of the following can act as a catalyst in the decomposition of bleaching powder?<br/>
Question 49 :
The pHof a soft drink is $3.82$. The hydrogen ion concentration wil be: (given antilog $0.18=1.5$)
Question 50 :
The pair whose both species are used in antacid medicinal preparation is<br>
Question 51 :
The process to heat the ore in the presence of excess supply of air below its melting point is called as ________.<br/>
Question 52 :
A magnesium ion has a net positive charge while the magnesium atom has __________. 
Question 55 :
In electrolytic refining, which one is the anode and which is cathode?
Question 58 :
The attraction between molecules and salt, when a salt is dissolved in water molecules, is :
Question 59 :
Which among the following metals is employed to provide cathodic protection to iron?
Question 61 :
Process of depositing a thin layer of zinc metal on iron objects is called:
Question 62 :
The bonds present in $\left( { N }_{ 2 }{ O }_{ 5 } \right) $ are:<br/>
Question 65 :
During electrolytic refining of copper.<br/>(a) Pure copper acts as anode.<br/>(b) Pure copper acts as cathode.<br/>(c) Impure copper acts as anode.<br/>(d) Impure copper acts as cathode.<br/>
Question 66 :
In case of formation of ionic compounds, the electronegativity difference between them is less than 1.7.<br/>
Question 68 :
We have $CuSO_4$ solutions (blue) in two beakers A and B. In beaker A we add Ag pieces and in B we add Zn pieces. What will happen in A if :<br/>1. $Cu^{2+}$ is reduced to Cu<br/>2. no reaction.
Question 72 :
Give the melting point of sodium in degrees Kelvin and degrees Fahrenheit.
Question 73 :
The sodium is made by electrolysis of a molten mixture of 40% NaCl and 60% $CaCl_2$ because :
Question 76 :
What is the reaction occuring at the anode inDown's process for the extraction of sodium?<br>
Question 77 :
The electronic arrangements of four elements i, ii, iii, iv are:<br/>(i) $1 s^2$ (ii) $1s^22s^22p^2$ (iii) $1s^22s^22p^5$ (iv) $1s^22s^22p^6$<br/>The tendency to form ionic bond is maximum in:<br/>
Question 79 :
$2PbS + 3O_2 \longrightarrow A + 2SO_2$<br>The name of A is :
Question 80 :
Which of the following is the last stable element found and has highest boiling point?
