Question 1 : A cold, green flame can be made by passing <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ead46e141e6ca4117817c69"> over warm:
Question 2 :
The idea which prompted Bartlett to prepare first ever compound of noble gas was:
Question 4 :
N<sub>2</sub> forms NCl<sub>3</sub>, whereas P can form both PCl<sub>3</sub> and PCl<sub>5 </sub>why?
Question 6 :
The core of a non-luminous Bunsen burner flame is observed to be yellow in colour. This is because of:
Question 9 :
Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that
Question 10 : Vegetable colouring matter in presence of moisture is bleached by <img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ead46c66694ca4eac0fbbb7"> due to:
Question 18 : Assertion: $Al$ forms ${[Al{F}_{6}]}^{3-}$ but $B$ does not form ${[{BF}_{6}]}^{3-}$
Reason: $B$ does not react with fluorine.<br/><div><p dir="ltr">Read the above assertion and reason and choose the correct option regarding it.</p></div>
Question 19 :
Assertion (A) : Boron forms covalent compounds.<br/>Reason (R): Boron is a non-metal.
Question 23 :
Assertion: Borax forms alkaline aqueous solution.
Reason: Borax is the salt of a weak acid $({ H }_{ 3 }{ BO }_{ 3 })$ and a strong base $(NaOH)$.
Question 24 :
The mineral colemanite is finely powdered and boiled with sodium carbonate solution. The precipitate of $CaCO_3$ and other two products $X$ and $Y$ are formed. On passing a current of $CO_2$, $Y$ produces $X$. What is the oxidation state of boron in compound $Y$?
Question 26 :
Which of the following statements about anhydrous aluminium chloride is correct ?
Question 27 : When boron oxide is reduced with carbon in an electric furnace, a disproportionation reaction takes place.<div><br/></div><div>$2B_2O_3+7C\longrightarrow A+B$<br/><div><br/></div><div>It is found that Compound $A$ is harder than diamond. What is the physical state of compound $B$?<br/></div></div>
Question 28 :
$ B^{3+} $ ion can not exist in aqueous solution because of its :
Question 29 :
Assertion: $TlCl_3$ is more stable than $TlCl$
Reason: $+1$ oxidation state of $Tl$ is more stable than $+3$.
Question 30 :
Match the ores from the List-I with their corresponding formulae from List-II.<br/>List -I                                                        List -II<br/>A. Borax                                                   1) $Al_{2}O_{3}.2H_{2}O$<br/>B. Razorite                                               2) $Ca_{2}B_{6}O_{11}.5H_{2}O$ <br/>C. Bauxite                                                3) $Na_{2}B_{4}O_{7}4H_{2}O$<br/>D.Colemanite                                           4) $Na_{2}B_{4}O_{7}10H_{2}O$
Question 33 :
For which of the following, the units of rate and rate constant of the reaction is identical?
Question 36 :
A zero order reaction is one in which the rate of the reaction is independent of ______________.<br/>
Question 38 :
Chemical reactions of the type $X \; \overset{k_1}{\rightarrow} \; Y \; \overset{k_2}{\rightarrow} \; Z$ are called:
Question 40 :
The mechanism of the reaction :$\:A+2B+C\rightarrow D$ is<br/><b>(step-1)</b>$\;\;\;$(fast) equilibrium $\;\;A+B\rightleftharpoons X$<b><br/></b><b>(step-2)</b>$\;\;\;$(slow) $X+C\longrightarrow Y$<b><br/></b><b>(step-3)</b>$\;\;\;$(fast) $Y+B\longrightarrow D$<br/>Which rate law is correct?
Question 41 :
For a reaction that has $[A]$ and $[B]$ both doubled, the rate goes up by a factor of $8$. The rate law is: $rate = k[A]^{m}[B]^{2}$.<br>What is the rate order with respect to $[A]$?
Question 42 :
Assertion: The rate of reaction sometimes does not depend on concentration.
Reason: The order of reaction can be negative.
Question 43 :
For a reaction $\dfrac{dX}{dt}=K[H^{+}]^{n}$. If $pH$ of reaction medium changes from two to one, the rate becomes 100 times of the value at $pH$ $=$ 2. The order of reaction is:<br/>
Question 44 :
The velocity constant of first order reaction is expressed in the units:
Question 45 :
The reaction$\displaystyle  A(g)+2B(g)\rightarrow C(g)+D(g)$ is an elementary process. In an experiment, the initial partial pressure of A & B are $ P_{A} $ = 0.6 atm and $ P_{B} $ = 0.8 atm. The ratio of rate of reaction relative to initial rate when $P_{c} $ becomes 0.2 atm:
Question 46 :
In a reaction, the concentration of reactant is increased two times and three times then the increases in rate of reaction were four times and nine times respectively, order of reaction is:
Question 47 : A hypothetical reaction, $X_{2} + Y_{2}\rightarrow 2XY$ follows the following mechanism:<div><br/>$X_{2}\rightleftharpoons X + X ..... fast$<br/>$X + Y_{2} \rightarrow XY + Y ..... slow$<br/>$X + Y \rightarrow XY ..... fast$</div><div><br/>The order of the overall reaction is :</div>
Question 48 :
Tollen's reagent is used for the detection of aldehyde when a solution of $Ag{NO}_{3}$ is added to glucose with ${NH}_{4}OH$ then fluconic acid is formced<br/>${Ag}^{+}+{e}^{-}\rightarrow Ag$;<br/>${E}_{red}^{o}=0.8V$<br/>${C}_{6}{H}_{12}{O}_{6}+{H}_{2}O\rightarrow {C}_{6}{H}_{12}{O}_{7}$ (Gluconic acid)$+2{H}^{+}+2{e}^{-}$; ${E}_{red}^{o}=-0.05V$<br/>$Ag{({NH}_{3})}_{2}+{e}^{-}\rightarrow Ag(s)+2{NH}_{3}$;<br/>(Use $2.202\times \cfrac{RT}{F}=0.0592$ and $\cfrac{F}{RT}=38.92 $at $298K$)<br/>$2{Ag}^{+}+{C}_{6}{H}_{22}{O}_{6}+{H}_{2}O\rightarrow 2Ag(s)+{C}_{6}{H}_{212}{O}_{7}+2{H}^{+}$<br/>Find $\ln {K}$ of this reaction?
Question 49 :
For a homogeneous gaseous reaction $A \rightarrow 3B,$ if pressure after time t was $P_{r}$ and after completion of reaction, pressure was $P_{\infty}$ then select correct relation
Question 51 :
Assertion: Molecularity has no meaning for a complex reaction.
Reason: The overall molecularity of a complex reaction is equal to the molecularity of the slowest step.
Question 52 :
The ionization constant of $\overset{\oplus} NH_4$ ion in water is $5.6 \times 10^{-10}$ at $25^{\circ}C$. The rate constant the reaction of $\overset{\oplus}N H_4$ and $\overset{\ominus}O H$ ion to form $NH_3$ and $H_2O$ at $25^{\circ}C$ is $3.4 \times 10^{10} L mol^{-1} s^{-1}$. Calculate the rate constant for proton transfer from water to $NH_3$:
Question 54 :
The unit cell of a binary compound of $A$ and $B$ metals has a ccp structure with $A$ atoms occupying the corners and $B$ atoms occupying the centers of each face of the cubic unit cell. If during the crystallization of this alloy, in the unit cell two $A$ atoms are missed, the overall composition per unit cell is:
Question 56 :
In a face centred cubic cell, what is the contribution of an atom at the face-center?
Question 57 :
In a cubic unit cell, $A$ atoms are present on alternate faces and $C$ atoms are present on alternate edges and body centre of the cube. the simplest formula of compound is:
Question 62 :
A crystal formed by two elements $X$ and $Y$ in cubic structure. $X$ atoms are at the corners of cube while $Y$ atoms are at the face center. The formula of he compound will be:
Question 63 :
The density of argon (face centered cubic cell) is $1.83\, g/cm^3$ at $20^oC$. What is the length of an edge a unit cell?
Question 64 :
If in a cubic cell, atoms $A$ present at all corners and atoms $B$ at the center of each face. What will be the molecular formula of the compound, if all the atoms present in one body diagonal are replaced by atom $C$?<br>
Question 65 :
Aluminium crystallizes in a cubic close packed structure. Its metallic radius is $125pm$.<br>i) Calculate the edge length of unit cell<br>ii) How many unit cells are there in $1.00cm^3$ of aluminium?
Question 66 :
Radii of $A^+$ and that of $X^-$ and $Y^-$ have been given as<br/>$A^+=1.00$ pm<br/>$X^-=1.00$ pm<br/>$Y^-=2.00$ pm<br/>Determine the volume of unit cells of AX and AY crystals.<br/>
Question 67 :
Assertion: It occupies certain holes of this type but not the other holes of the same type?
Reason: The proximity of two cations $(A^{2+ }\,\,and \,\,B^{4+})$ would be electrostatically unfavourable.
Question 68 :
A solid has three types of atoms $X,\ Y$ and $Z$. $X$ forms an $FCC$ lattice with $Y$ atoms occupying all the tetrahedral voids and $Z$ atoms occupying half of the octahedral voids. The formula of the solid is
Question 69 : The ratio of the volume of a tetragonal lattice unit cell to that of a hexagonal lattice unit cell is: <div>(both having same respective lengths)</div>
Question 70 :
A binary solid has a primitive cubical structure with $B^-$ ions constituting the lattice points and $A^+$ ions occupying 25% of its tetrahedral holes. The molecular formula of the crystal is:<br/>
Question 71 :
$Al$(at.wt.$27$) crystallizes in the cubic system with a cell edge of $4.05\mathring { A } $. Its density is $2.7g/{ cm }^{ 3 }$. Determine the unit cell type and calculate the radius of the $Al$ atom.
Question 72 :
A compound is formed by cation $C$ and anion $A$. The anions form hexagonal close packed (hcp) lattice and the cations occupy $75\%$ of octahedral voids. The formula of the compound is :
