Question 1 :
State true or false.<br/>In a chemical equation, the products are written on the left-hand side and the reactants on the right-hand side with an arrow in between.
Question 2 :
$KXO_3$(s) well mixed with water, temperature of solution falls. This reaction is:<br/>
Question 3 :
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 4 :
Other signs of a chemical reaction might be an increase in temperature if heat is released or a change in _____.
Question 5 :
In the reaction, $4Fe+3O_2\rightleftharpoons 4Fe^{3+}+6O^{2-}$ Which of the following statements is incorrect?
Question 7 :
Which of the following reaction requires oxygen to be a reactant ?
Question 8 :
Three cations $A, B, C$ are allowed to react with ammonium hydroxide solution. $A$ and $B$ produce a dirty green precipitate and a reddish brown precipitate respectively, both of which do not dissolve on further addition of ${NH}_{4}OH$. $C$ gives pale blue colour precipitate with less amount of ammonium hydroxide and on further addition of ${NH}_{4}OH$, precipitate becomes soluble and deep blue colour solution is formed:
Question 9 :
Name the type of the following chemical reaction.$2KClO_3 \rightarrow 2KCl +3O_2$
Question 11 :
The substance that initially involved in a chemical reaction is called a reactant.
Question 14 :
A chemical reaction in which heat is evolved is called a/an:<br/>
Question 15 :
Which type of chemical decomposition reaction is the following reaction?<br>$Cu(OH)_2\xrightarrow {heat} CuO+H_2O$
Question 17 :
Balanced chemical equations imply which of the following?<br>$I$. Numbers of molecules are conserved in chemical change<br>$II$. Numbers of atoms are conserved in chemical change.<br>$III$. Mass is conserved in chemical change.
Question 19 :
State true or false.<br/><br/>In redox reactions, oxidation and reduction take place simultaneously.<br/>
Question 20 :
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 21 :
Reaction of iron nails with copper sulphate solution is an example of ____________.
Question 22 :
Reaction of iron nails with copper sulphate solution is an example of:<br>
Question 23 :
The digestion of food in the body is an example of __________ reaction.
Question 24 :
Which of the following is(are) an endothermic process(es) ?<br>(i) Dilution of sulphuric acid<br>(ii) Sublimation of dry ice<br>(iii) Condensation of water vapours<br>(iv) Evaporation of water<br>
Question 25 :
Name the type of following chemical reaction.$KNO_3 + H_2SO_4 \rightarrow HNO_3 + KHSO_4$
Question 26 :
Which of the following is (are) not an example of a decomposition reaction?
Question 29 :
$p{ K }_{ a }$ values of four acids are given below at ${ 25 }^{ o }C$. The strongest acid is:
Question 30 :
The hydrogen ion concentration of the oceans is about $2\times10^{-9}\space M$. What is the $pH$?
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 :
The acid present in the body of red ant is ________.<br/>
Question 36 :
Four solutions A, B, C and D when tested with universal indicator showed pH as $4, 11, 7$ and $9$ respectively. Which one of the four solutions is neutral?<br/>
Question 37 :
Calculate the pH of a solution which is 0.1 M in HA and 0.5M in NaA. Ka for HA is $1.8\times { 10 }^{ -6 }$?
Question 39 :
$pK_{a}$ 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 41 :
Effervescence is seen when a bottle of soda water is opened.
Question 44 :
Statement I: A basic solution has more hydrogen ions than an acidic solution.<br/>Statement II: pH is defined as the -log $[H^+]$.<br/>
Question 47 :
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 49 :
What is used as a bleaching linen, wood pulp and washed clothes in laundry?
Question 52 :
Select correct statement for <b>50ml 0.1M</b> ${ H }_{ 2 }A(aq.)$ solution ; ${ { K }_{ a } }_{ 1 }={ 10 }^{ -5 } ; { { K }_{ a } }_{ 2 }={ 10 }^{ -8 }$<br/>
Question 53 :
What is the nature of solution at ${60}^{o}C$ whose $pH$ is $6.35$?
Question 55 :
When manganese dioxide is heated with aluminium powder, the products obtained are _________ .<br/>
Question 57 :
Most of the metals which occurs in native state in nature:
Question 59 :
Assertion: Zinc is used in the galvanization of iron.
Reason: Its coating on iron articles increases their life by protecting them from rusting.
Question 62 :
The complete loss of an electron of one atom to another atom with the consequent formation of electrostatic charges is said to be
Question 63 :
Process of depositing a thin layer of zinc metal on iron objects is called:
Question 64 :
The structure of glycine (amino acid) is $H_{2}N-CH_{2}COO^{-}$ ($z$ witter ion). Select the correct statement:-
Question 70 :
Which of the following is a correct property for solid magnesium carbonate?
Question 73 :
Coulomb's law is used to calculate the energy of an ion pair.
Question 74 :
In CaF$_2$, the number of electron(s) transferred from calcium to fluorine atoms are_____.
Question 75 :
Separation of impurities from the extracted metals is known as __________.
Question 76 :
The attraction between molecules and salt, when a salt is dissolved in water molecules, is :
Question 78 : Which one of the methods given in column- I is applied for the extraction of the metal given in column II:<br/><blockquote><table class="wysiwyg-table"> <tbody><tr> <td><b>Column -I</b></td> <td><b>Column - II</b></td> </tr> <tr> <td>(A) Electrolytic reduction</td> <td>(i) Aluminium</td> </tr> <tr> <td>(B) Reduction with carbon</td> <td>(ii) Zinc</td> </tr> <tr> <td>(C) Reduction with aluminium</td> <td>(iii) Sodium</td> </tr> <tr> <td> </td> <td>(iv) Iron</td> </tr> <tr> <td> </td> <td>(v) Manganese</td> </tr> <tr> <td> </td> <td>(vi) Chromium</td> </tr></tbody></table></blockquote>
Question 81 :
What happens when water vapour is passed over a red hot iron?
