Which of the following statements is not correct regarding the gas evolved by the reaction of dilute HCl on $\mathrm{CaCO}_3$ ?

Which of the following gives more number of oxides on reacting with HCl ?

Which of the following statements is not correct?

Boron trifluoride on reaction with lithium aluminium hydride in ether gives $\mathrm{LiF}^{\circ} \mathrm{AlF}_3$ and $X . X$ on reaction with $\mathrm{NH}_3$ gives $Y$. $Y$ on further heating gives a compound $Z$. The number of $\sigma$-bonds and $\pi$-bonds in $Z$ are $x$ and $y$ respectively. $(x+y)$ is equal to

Sulphur dioxide on reaction with chlorine in the presence of charcoal gives compound $(A)$. This on reaction with white phosphorus gives $\mathrm{SO}_2$ and compound $(B)$. The correct statement about ' $B$ ' is

Diborane on hydrolysis gives a compound $X$. The correct statement about $X$ are

I. It is a tribasic acid

II. It is a weak monobasic acid

III. It has a layer structure

IV. It is highly soluble in water

Choose the correct statement about allotropes of carbon.

I. Graphite has layered structure.

II. Buckminster fullerene is not aromatic in nature.

III. The distance between two adjacent layers in graphite is 141.5 pm .

IV. The hybridisation of carbon in graphite and Buckminster fullerene is same.

Which one of the orders is correctly matched with the property mentioned against it?

Noble gas ' $X$ ' is used as a diluent for oxygen in modern diving apparatus and noble gas ' $Y$ ' is used mainly to provide an inert atmosphere in high temperature metallurgical processes ' $Y$ ' and ' $X$ ' are respectively?

The dibasic oxoacid of phosphorus on disproportionation given two products $A$ and $B . A$ and $B$ are respectively.

Identify the electron rich hydrides from the following

Which of the following is an incorrect statement about the compounds of group 13 elements?

The incorrect statement about the oxidation states of group 14 elements is

Thionyl chloride on reaction with white phosphorus gives a compound of phosphorus ' $C$ ' which on hydrolysis gives an oxo acid ' $O$ '. The correct statement about $C$ and $O$ are

I. Shape of ' $C$ ' is pyramidal

II. ' $O$ ' is a dibasic acid

III. ' $O$ ' is a monobasic acid

IV. ' $C$ ' on reaction with acetic acid given ' $O$ '

Which one of the following statements is not correct?

Consider the following.

Assertion (A) Phosphorus can form both phosphorus (III) and phosphorus (V) chlorides but nitrogen cannot form nitrogen (V) chloride.

Reason (R) The electronegativity of nitrogen is more than that of phosphorus.

The correct answer is

The correct statements about the compounds of boron are

I. In borax bead test, the colour of cobalt metaborate is blue.

II. Diborane is prepared by the oxidation of sodium borohydride with iodine.

III. In diborane oxidation state of hydrogen is +1 .

IV. Boric acid is a tribasic acid.

An oxoacid of phosphorus ' $X$ ' reduces silver nitrate solution to metallic silver and gets oxidised to another compound $Y . X$ and $Y$ respectively are

Zinc on reaction with concentrated nitric acid gives an oxide of nitrogen $(A)$. Zinc with dilute nitric acid gives another oxide of nitrogen $(B)$. Oxidation numbers of nitrogen in $(A)$ and $(B)$ are respectively

Identify the reaction related to Deacon's process

Phosphorus on reaction with sulphuryl chloride gives a compound $X$, which on complete hydrolysis gives $Y$. $X$ and $Y$ are respectively.

Xenon hexafluoride on partial hydrolysis gives ' $X$ ' and HF . The shape of ' $X$ ' is

Which of the following pairs of oxoacids have basicity as 2?

Which among the following oxoacids of phosphorous will have $\mathrm{P}-\mathrm{O}-\mathrm{P}$ bonds?

I. $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}$

II. $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{6}$

III. $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7}$

IV. $\left(\mathrm{HPO}_{3}\right)_{3}$

What are $X$ and $Y$ respectively in the following reactions ?

$ X \stackrel{\mathrm{CO}}{\longleftarrow} \mathrm{~B}_{2} \mathrm{H}_{6} \xrightarrow[\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{O}]{\mathrm{NaH}} Y $

Which of the following statements are correct?

(i) $\mathrm{CCl}_{4}$ undergoes hydrolysis easily

(ii) Diamond has directional covalent bonds

(iii) Fullerene is thermodynamically most stable allotrope of carbon

(iv) Glass is a man-made silicate

The correct answer is

Observe the following reactions (unbalanced)

$ \begin{array}{r} \mathrm{P}_{2} \mathrm{O}_{3}+\mathrm{H}_{2} \mathrm{O} \longrightarrow X \\ \mathrm{P}_{4} \mathrm{O}_{10}+\mathrm{H}_{2} \mathrm{O} \longrightarrow Y \end{array} $

The number of $\mathrm{P}=\mathrm{O}$ bonds present in $X, Y$ are respectively

Observe the following species.

(i) $\mathrm{NH}_3$

(ii) $\mathrm{AlCl}_3$

(iii) $\mathrm{SnCl}_4$

(iv) $\mathrm{CO}_2$

(v) $\mathrm{Ag}^{+}$

(vi) $ \mathrm{HSO}_{4}^{-} $

How many of the above species act as Lewis acids?

Consider the following reactions (not balanced).

$ \begin{array}{r} \mathrm{BF}_3+\mathrm{NaH} \xrightarrow{450 \mathrm{~K}} X+\mathrm{NaF} \\ X+\mathrm{H}_2 \mathrm{O} \longrightarrow Y+\mathrm{H}_2 \uparrow \end{array} $

The correct statements about $X$ and $Y$ are

I. $X$ is an electron deficient molecule.

II. in $X, B-B$ bond is present.

III. $Y$ is a weak tribasic acid.

IV. $Y$ acts as a Lewis acid.

Consider the following reactions.

$ X+\mathrm{O}_2 \rightarrow \mathrm{Cu}_2 \mathrm{O}+\mathrm{SO}_2, \mathrm{Cu}_2 \mathrm{O}+X \rightarrow \mathrm{Cu}+Y \uparrow $

The shape of the molecule $Y$ is

Which of the following when subjected to thermal decomposition will liberate dinitrogen ?

(i) Sodium nitrate

(ii) Ammonium dichromate

(iii) Barium azide

Zeolite is a silicate of two metal ions $X$ and $Y . X$ and $Y$ are respectively

Which of the following has lowest melting point?

Among the hydrides of group 16 elements, the hydride $X$ has lowest boiling point and the hydride $Y$ has highest boiling point. $X$ and $Y$ respectively are

Sodium nitrite with hydrochloric acid gives water alongwith two nitrogen oxides. They are

Identify the incorrect statement about the interhalogen compounds.

Aluminium reacts with dilute HCl and liberates a gas ' $A$ ' and with aqueous alkali liberates a gas ' $B$ '. $A$ and $B$ respectively are

Identify the incorrect statement about the oxidation states of group 14 elements.

$ \begin{array}{r} \mathrm{P}_4+3 \mathrm{NaOH}+3 \mathrm{H}_2 \mathrm{O} \xrightarrow{\mathrm{CO}_2} 3 X+\mathrm{PH}_3 \uparrow \\ X \xrightarrow{\mathrm{HCl}(\mathrm{aq})} Y+\mathrm{NaCl} \end{array} $

The incorrect statement about $Y$ is

Consider the following statements about the oxides of halogens.

A. At room temperature, $\mathrm{OF}_2$ is thermally stable.

B. Order of stability of oxides of halogens is

$ \mathrm{I}>\mathrm{Br}>\mathrm{Cl} . $

C. $\mathrm{I}_2 \mathrm{O}_5$ is used in the estimation of CO .

D. $\mathrm{ClO}_2$ is used as a bleaching agent.

The correct statements are,

$ \begin{aligned} \mathrm{XeF}_4+\mathrm{O}_2 \mathrm{~F}_2 & \longrightarrow X+\mathrm{O}_2 \\ X+\underset{(1 \text { mole })}{\mathrm{H}_2 \mathrm{O}} & \longrightarrow Y+2 \mathrm{HF} \end{aligned} $

The shapes of molecules of $X$ and $Y$ respectively are

Identify the correct statements from the following.

A. In photosynthesis reaction, water is oxidised to oxygen.

B. An example for interstitial hydride is $\mathrm{MgH}_2$.

C. Sodium hexametaphosphate is used in the removal of permanent hardness of water.

Consider the following statements about group 13 elements.

A. $\mathrm{AlCl}_3$ gets stability by forming a dimer.

B. $\mathrm{BCl}_3$ is an electron deficient molecule.

C. $E_{M^{3+} / M}^{\circ}(\mathrm{V})$ is +1.26 for aluminium.

D. In +1 oxidation state thallium is unstable.

The incorrect statements are

What is the correct order of melting temperature of $\mathrm{C}, \mathrm{Si}, \mathrm{Ge}$ ?

Which one of the following statements is correct?

Which oxo-acid of sulphur contains $\mathrm{S}-\mathrm{O}-\mathrm{S}$ bond?

Identify the correct pairs in which the chemical substance given is correctly matched its use

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  <mi data-mjx-auto-op="false">Cl</mi>

</mrow>

<mn>2</mn>

<mrow data-mjx-texclass="ORD">

  <mi data-mjx-auto-op="false">Cl</mi>

</mrow>

<mn>2</mn>

<mrow data-mjx-texclass="ORD">

  <mi mathvariant="normal">I</mi>

</mrow>

<mn>2</mn>

<mrow data-mjx-texclass="ORD">

  <mi mathvariant="normal">O</mi>

</mrow>

<mn>5</mn>

<mrow data-mjx-texclass="ORD">

  <mi mathvariant="normal">I</mi>

</mrow>

<mn>2</mn>

<mrow data-mjx-texclass="ORD">

  <mi mathvariant="normal">O</mi>

</mrow>

<mn>5</mn>

<mrow data-mjx-texclass="ORD">

  <mi mathvariant="normal">O</mi>

</mrow>

<mn>3</mn>

<mrow data-mjx-texclass="ORD">

  <mi mathvariant="normal">O</mi>

</mrow>

<mn>3</mn>

Kernite and cryolite are the minerals of two elements $X$ and $Z$. Respectively $X$ and $Z$ are

Choose the correct statement from the following with reference to inert pair effect.

Identify the correct orders from the following with respect to the property associated with

A. $\mathrm{NH}_3>\mathrm{PH}_3>\mathrm{AsH}_3>\mathrm{SbH}_3-$ Bond angle

B. $\mathrm{NH}_3>\mathrm{PH}_3>\mathrm{AsH}_3>\mathrm{SbH}_3-$ Basic character

C. $\mathrm{PH}_3>\mathrm{AsH}_3>\mathrm{SbH}_3>\mathrm{NH}_3-$ Thermal stability

D. $\mathrm{SbH}_3>\mathrm{NH}_3>\mathrm{AsH}_3>\mathrm{PH}_3-$ Boiling point

The dioxides and monoxides of elements $X$ and $Y$ are amphoteric in nature. $X$ and $Y$ are respectively

Assertion (A) : In group 15 elements nitrogen does not form pentahalides.

Reason (R) : Nitrogen can exhibit +5 oxidation state.

The correct option among the following is

Which of the following reaction represents Deacon's method?

What are the correct statements about the elements of group 13 given below?

(I) The stability of +1 oxidation state follows the order $\mathrm{Tl}>\mathrm{In}>\mathrm{Ga}$.

(II) Boron has the lowest melting point and boiling point as it is a non-metal.

(III) Boron shows a maximum covalency of 4 in its compounds.

(IV) The order of atomic radius is $\mathrm{Ga}>\mathrm{Al}>\mathrm{In}$.

(V) Aluminium is passive to concentrated nitric acid.

Consider the reaction,

$ \mathrm{P}_4+3 \mathrm{NaOH}+3 \mathrm{H}_2 \mathrm{O} \longrightarrow Q+3 \mathrm{NaH}_2 \mathrm{PO}_2 $

Identify the reaction in which $Q$ is not the product. (equations are not balanced)

A black coloured element with $n s^2 n p^1$ outer electronic configuration cannot react with air in its crystalline form. However, in amorphous form, it gives an oxide in air which is acidic in nature. Identify the element.

The element that does not show catenation is

In the following, the oxoacid with a peroxy bond is

Chlorine is allowed to react with excess of ammonia. In this, 1 mole of chlorine can oxidise ' $Z$ ' moles of $\mathrm{NH}_3$. ' $Z$ ' is

The correct order of enthalpy of vaporisation of noble gases is

Assertion $(\mathrm{A})\left[\mathrm{B}\left(\mathrm{OH}_2\right)_6\right]^{3+}$ and $\left[\mathrm{B}(\mathrm{OH})_4\right]^{-}$form octahedral and tetrahedral structures.

Reason (R) Being electron deficient, boron readily reacts with Lewis bases like $\mathrm{H}_2 \mathrm{O}, \mathrm{OH}^{-}$ The correct option among the following is

The minimum temperature required for a non-catalytic reaction between $\mathrm{N}_2$ and $\mathrm{O}_2$ is

Assertion (A) Both rhombic and monoclinic sulphur have $\mathrm{S}_8$ molecules.

Reason (R) They have planar structure.

The correct option among the following is

The chemical structures of $\mathrm{XeO}_3$ and $\mathrm{XeOF}_4$, respectively, are

$\mathrm{Al}+$ aq. NaOH (excess) $\longrightarrow P+Q \cdot P$ and $Q$ are

Among the following elements, $X$ exhibits maximum catenation and $Y$ is the least abundant on earth. $X$ and $Y$ elements are

The oxoacid of phosphorus which contains $4 \mathrm{P}-\mathrm{O}-\mathrm{H}, 2 \mathrm{P}=\mathrm{O}$ and one $\mathrm{P}-\mathrm{O}-\mathrm{P}$ bond is

Group 16 elements are also called

For the reaction, $\mathrm{Br}_2+\mathrm{F}_2$ (excess) ⟶ P , the molecular formula and structure of P , respectively, are

In the following reaction, $a, b, p, q, r$ and $s$ are $a \mathrm{XeF}_4+b \mathrm{H}_2 \mathrm{O} \longrightarrow p \mathrm{Xe}+q \mathrm{XeO}_3+r \mathrm{HF}+s \mathrm{O}_2$

Phosphorus and phosphoric acids are, respectively,

............... acids.

The correct order of Lewis acidic character of boron trihalides is

The acidic oxide from the following is

A nitrogen oxide that forms "in situ" when dilute $\mathrm{FeSO}_4$ is treated with aqueous solution of nitrate ion and then careful addition of conc. $\mathrm{H}_2 \mathrm{SO}_4$ along the sides of test tube, is

$ \text { Match the following. } $

$ \begin{array}{lcll} \hline & \text { Column-I (Molecule) } & & \text { Column-II (Colour) } \\ \hline \text { (A) } & \mathrm{F}_2 & \text { (I) } & \text { Red } \\ \hline \text { (B) } & \mathrm{Cl}_2 & \text { (II) } & \text { Violet } \\ \hline \text { (C) } & \mathrm{Br}_2 & \text { (III) } & \text { Yellow } \\ \hline \text { (D) } & \mathrm{I}_2 & \text { (IV) } & \text { Greenish yellow } \\ \hline \end{array} $

$ \text { The correct match is } $

The correct decreasing order of the following ' Xe ' compounds to act as both fluorinating and oxidising agent is

(i) $\mathrm{XeF}_6$

(ii) $\mathrm{XeF}_4$

(iii) $\mathrm{XeF}_2$

When aluminium chloride is dissolved in water, it gives

The total number of paramagnetic gaseous products formed in all the following reactions $[A+B+C]$ are

(A) $\mathrm{NH}_4 \mathrm{NO}_3 \xrightarrow{\Delta}$ Products

(B) $\mathrm{NaNO}_2+\mathrm{H}_2 \mathrm{SO}_4 \longrightarrow$ Products

(C) $\mathrm{Pb}\left(\mathrm{NO}_3\right)_2 \xrightarrow{673 \mathrm{~K}}$ Products

The main products $P$ and $Q$ of the following unbalanced disproportionation reaction $\mathrm{Se}_2 \mathrm{Cl}_2 \longrightarrow P+Q$ are

The correct order of acidity of $\mathrm{HClO}, \mathrm{HBrO}$ and HIO is

Aluminium when treated with aqueous NaOH , liberates a gaseous molecule majorly. The gas is

The relative order of electronegativity of $\mathrm{C}, \mathrm{Ge}$, and Pb is

In which of the following reactions there is no liberation of nitrogen gas

The correct order of boiling points of $\mathrm{H}_2 \mathrm{O}, \mathrm{H}_2 \mathrm{~S}, \mathrm{H}_2 \mathrm{Se}$ and $\mathrm{H}_2$ Te respectively is

Which of the following is not a mineral of fluorine?

The element that even can diffuse through silica glass is

Borax is converted into crystalline boron by the following steps :

$ \text { Borax } \xrightarrow[\mathrm{H}_2 \mathrm{O}]{X} \mathrm{H}_3 \mathrm{BO}_3 \xrightarrow{\Delta} \mathrm{~B}_2 \mathrm{O}_3 \xrightarrow[\Delta]{Y} B $

Identify $X$ and $Y$ respectively.

Buckminister fullerene contains the following $X$ number of six and $Y$ number of five member rings. What is the value of $X$ and $Y$ ?

The number of dissociable protons in "orthophosphoric acid" is

Pick the correct statement.

I. Borax is white crystalline solid containing $\left[\mathrm{B}_4 \mathrm{O}_5(\mathrm{OH})_4\right]^{2-}$ units.

II. Aqueous solution of borax is acidic in nature.

III. Cobalt gives blue colour in borax bead test.

Which element does not show catenation property?

Phosphine is prepared by the reaction of $\mathrm{P}_4$ with which of the following?

The most stable form of sulphur allotrope is

An aqueous solution of borax is

The molecular formula of metaphosphoric acid is

The final acid product obtained during the synthesis of $\mathrm{H}_2 \mathrm{SO}_4$ by contact process is

Which of the following elements reacts with water?

When copper metal is treated with cold and dilute nitric acid, it forms

Which one of the following is not a colourless compound?