

InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
951. |
What mass of hydrogen peroxide will be present in 2 litres of a 5 molar solution? Calculate the mass of oxygen which will be liberated by the decomposition of 200 ml. of this solution. |
Answer» Molar mass of H2O2 = 34 g mol-1 1L of 5M solution of H2O2 will contain H2O2 = 34 × 5 g 2L of 5M solution of H2O2 will contain H2O2 = 2 × 34 × 5 = 340 g 200 mL of 5M solution will contain H2O2 = \(\frac{340}{2000}\) × 200 = 34 g 2H2O2 → H2O + O2 68g of H2O2 on decomposition will give O2 = 32g 34g of H2O2 on decomposition will give O2 = \(\frac{32}{68}\) × 34 = 16g |
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952. |
Assertion : Hydrides of N, O and F have lower boiling points than the hydrides of their subsequent group members. Reason : Boiling point depends upon the molecular mass only.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
Answer» Correct Answer - D Boiling point depends upon intermolecular forces. Due to higher electronegativity of N, O and F, the magnitude of hydrogen bonding in their hydrides will be quite high. Hence their biling points will be higher than the hydrides of their subsequent group members. |
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953. |
Which one of the following statements about water is false ?A. Water is oxidized to oxygen during photosynthesisB. water can act both as an acid and as a baseC. There is extensive intramolecular hydrogen bonding in the condensed phaseD. Ice formed by heavy water sinks in normal water |
Answer» Correct Answer - C There is extensive intermolecular H-bonding in the condensed phase. |
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954. |
Statement 1: Highest adsorption tendency of H is on Pt. Statement-2: In `H_(2)`, protium is 99% by mass. statement 3: `H_(2)&O_(2)` react only under vigorous conditionsA. TFTB. FTTC. TTFD. FFT |
Answer» Correct Answer - A | |
955. |
Which property of water is responsible for its very strong hydrating tendency? |
Answer» Dielectric constant. | |
956. |
Which of the following statements is correct ?A. Metallic hydrides are deficient of hydrogen?B. Metallic hydrides conduct heat and electricityC. Ionic hydrides do not conduct electricity in solid state.D. Ionic hydrides are very good conductors of electricity in solid state. |
Answer» Correct Answer - A::B::C Statement (d) is wrong while all other statements are correct. |
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957. |
In the following questions, a statement of Assertion (A) is given followed by a corresponding statement of Reason (R) just below it. Of the statements, mark the correct answer as –(A) If both assertion and reason are true, and reason is the true explanation of the assertion.(B) If both assertion and reason are true, but reason is not the true explanation of the assertion.(C) If assertion is true, but reason is false.(D) If both assertion and reason are false.Assertion (A). Nascent hydrogen can discharge the pink colour of KMnO4 solution.Reason (R). Nascent hydrogen is much more reactive than dihydrogen. |
Answer» (A) If both assertion and reason are true, and reason is the true explanation of the assertion. |
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958. |
A clear transparent liquid is taken in a glass. Which of the following will provide clue whether it is water or notA. Adding a litmus paperB. Adding few drops of liquid over potassium chlorideC. Adding a few drops of liquid over anhydrous copper sulphateD. Tasting and smelling of liquid. |
Answer» Correct Answer - C Water turns white coloured `CuSO_(4)` to blue coloured `CuSO_(4).5H_(2)O` |
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959. |
Lead pipes are not used for carrying drinking water becauseA. They are covered with a coating of lead carbonateB. They are corroded by air and moistureC. Water containing dissolved air attacks lead forming soluble hydroxideD. None of these |
Answer» Correct Answer - C Due to plumbosolvency, had dissolves in water to a small extent to form soluble hydroxide which is poisonous so lead pipe is not used for carrrying drinking water. |
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960. |
The volume strength of `1*5 N H_(2)O_(2)` solution isA. 4.8B. 5.2C. 8.8D. 8.4 |
Answer» Correct Answer - D | |
961. |
The structure of H2O2 isa) Planerb) Non planerc) Sphericald) Linear |
Answer» b) Non planer |
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962. |
Which of the following cannot be used as a test for `H_(2)O_(2)`?A. A paper dipped in Pbs (black) true white when brought in contact with `H_(2)O_(2)`.B. It liberates iodine from KI solution which gives blue color with starch solution.C. It gives blue color with `K_(4)[Fe(CN)_(6)]`.D. It decolourises acidified `KMnO_(4)` solution. |
Answer» Correct Answer - C It does give blue with `K_(4)[Fe(CN)_(6)]`. |
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963. |
Heavy water is obtained bya) Boiling waterb) Fractional distillation of waterc) Prolonged electrolysis of waterd) Heating water |
Answer» c) Prolonged electrolysis of water |
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964. |
What is heavy water ?A. `H_(2)O^(18)`B. `D_(2)O`C. `H_(2)O^(17)`D. `H_(2)O` |
Answer» Correct Answer - B `D_(2)O` is known as heavy water. |
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965. |
Heavy water is obtained byA. boiling waterB. heating `H_(2)O_(2)`C. prolonged electrolysis of `H_(2)O`D. all of these. |
Answer» Correct Answer - C `D_(2)O` is prepared by repeated electrolysis of ordinary water contains a small amount of alkali. |
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966. |
Heavy water `(D_(2)O)` freezes atA. `-3.8^(@)C`B. `3.8^(@)C`C. `0^(@)C`D. `38^(@)C` |
Answer» Correct Answer - B Heavy water freezes at `3.8 .^(@)C`. |
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967. |
Which of the following reactions is not used in preparation of deuterium compounds using heavy water?A. `CaC_(2) + 2D_(2)O to C_(2)D_(2) + Ca(OD)_(2)`B. `SO_(3) + D_(2)O to D_(2)SO_(4)`C. `2AIN + 3D_(2)O to AI_(2)O_(3) + 2ND`D. `AI_(4)C_(3) + 12D_(2)O to 3CD_(4) + 4AI(OD)_(3)` |
Answer» Correct Answer - C `AlN+3D_(2)O to Al(OD)_(3)+underset("Deuteroammonia")(ND_(3))` |
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968. |
Explain with the help of reactions that how heavy water is used in the preparation of deuterium compounds? |
Answer» `CaC_(2)+2D_(2)OtoC_(2)D_(2)+Ca(OD)_(2)` `SO_(3)+D_(2)OtoD_(2)SO_(4)` `Al_(4)C_(3)+12D_(2)Oto3CD_(4)+4Al(OD)_(3)` |
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969. |
When the first element of the periodic table is treated with dioxygen, it gives a compound whose solid state floats on its liquid state. This compound has an ability to act as an acid as well as a base. What products will be formed when this compound undergoes autoionisation? |
Answer» The first element is hydrogen and its molecular form is dihydrogen (H2). It reacts with oxygen to form water whose solid state is ice which is lighter than water and floats over water. As an acid |
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970. |
Hardness of water is due to presence of salts ofA. `Na^(+)` and `K^(+)`B. `Ca^(2+)`and `Mg^(2+)`C. `Ca^(2+)` and `K^(+)`D. `Ca^(2+)` and `Na^(+)` |
Answer» Correct Answer - b Hardness of water due to the presence of bicarbonates, chlorides and sulphates of `Ca` and `Mg` on it. These `Ca^(2+)` and `Mg^(2+)` ions react with the anions of fatty acids present in soaps to form curdy white precipitates. As a result, hard water does not produce lather with soap immediately. |
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971. |
`CDCl_(3)` is extensively used as a solvent for scanning NMR spectra. How can it be prepared from `CHCl_(3)` ? |
Answer» Due to -I-effect of the three Cl atoms, the atoms, the electron density in the C-H bond decreases. In other words, hydrogen in `CHCl_(3)` is slightly acidic and thus can be easily abstracted by a strong base such as `OH^(-)` to form `""^(-)"CC"l_(3)` which then reacts with `D_(2)O` to form `CDCl_(3)` `underset("Chloroform")(Hto "CC"l_(3)) underset(-H_(2)O)overset(OH^(-))to `""_(-):"CC"l_(3)overset(D_(2)O) to underset("Chloroform")underset("Deuterated")(CDCl_(3))+ DOH` |
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972. |
Consider the following statements. (i) Silver, Gold, Mercury and Platinum do not have any effect on water. (ii) Carbon, Sulphur and Phosphorous do not react with water.(iii) Beryllium reacts with water less violently. Which of the following statements is/are not correct? (a) (i) only (b) (ii) and (iii) (c) (iii) only (d) (ii) only |
Answer» (c) (iii) only |
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973. |
The type of H-bonding present in ortho nitro phenol and p-nitro phenol are respectively ……(a) inter molecular H-bonding and intra molecular Hbonding (b) intra molecular H-bonding and inter molecular Hbonding (c) intra molecular H – bonding and no H – bonding (d) intra molecular H – bonding and intra molecular H – bonding |
Answer» (A) intra molecular H-bonding and inter molecular Hbonding |
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974. |
`H_2O_2` is reduced byA. `O_(3)`B. acidic `KMnO_(4)` solutionC. lead sulphide suspension in waterD. none of these |
Answer» Correct Answer - C `PbS+4H_(2)O_(2)toPbSO_(4)+4H_(2)O` |
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975. |
Which one of the following is used as a bleach? (a) Cl2 water (b) Br, water (c) Water gas (d) Liquid hydrogen |
Answer» (a) Cl2 water |
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976. |
Heavy water is used as ……(a) modulator in nuclear reactions (b) coolant in nuclear reactions (c) both (a) and (b) (d) none of these |
Answer» (c) both (a) and (A) Heavy water is used as moderator as well as coolant in nuclear reactions. |
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977. |
What do you understand by metallic hydrides? |
Answer» These are formed by many d-block and f-block elements. Unlike saline hydrides, they are almost always nonstoichiometric. example, LaH2.87, YbH2.55. |
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978. |
What properties of water make it useful as a solvent? What types of compound can it (i) dissolve and (ii) hydrolyse? |
Answer» A high value of dielectric constants (78.39 C2/Nm2) and dipole moment make water a universal solvent. Water is able to dissolve most ionic and covalent compounds. Ionic compounds dissolve in water because of the ion-dipole interaction, whereas covalent compounds form hydrogen bonding and dissolve in water. Water can hydrolyze metallic and non-metallic oxides, hydrides, carbides, phosphides, nitrides and various other salts. During hydrolysis, `H^(+) and OH^(–)` ions of water interact with the reacting molecule. Some reactions are: `CaO+H_(2)O to Ca(OH)` `NaH+H_(2)O to NaOH+H_(2)` `CaC_(2)+H_(2)O to C_(2)H_(2)+Ca(OH)_(2)` |
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979. |
Is the present position of hydrogen in the periodic table satisfactory? |
Answer» No, it is not. | |
980. |
Water is an/a oxide. (a) neutral(b) acidic (c) basic (d) amphoteric |
Answer» (d) amphoteric |
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981. |
Water is a ……(a) basic oxide (b) acidic oxide (c) amphoteric oxide (d) none of these |
Answer» (c) amphoteric oxide |
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982. |
(i) write reactions showing:(a) Oxidation of Fe2+ ions into Fe3+ by hydrogen peroxide in acidic medium.(b) Oxidation of KMnO4 into MnO2 by hydrogen peroxide in basic medium.(ii) Find the volume strength of 1.6 N H2O2 solution?(iii) Give one use of heavy water. |
Answer» (i) (a) 2Fe2+(aq) + H2O2 (aq) + 2H+ → 2Fe3+(aq) + 2H2O(l) (b) 2KMnO4 (aq) + 3H2O2 (aq) → 2MnO2 (s) + 2KOH(aq) + 3O2 + 2H2O(l) (ii) Strength of 1.6 NH2O2 solution = 1.6 x 17 gL-1 Now 68 g of H2O2 gives 22400 ml O2 at STP \(\therefore\) 1.6 × 17g of H2O2 will give = \(\frac{22400}{68}\) x 1.6 x 17 = 8960 ml of O2 at STP But 1.6 × 17 g of H2O2 are present in 1000 ml of H2O2 solution Hence 1000 ml of H2O2 will give = 8.97 ml of O2 at STP Hence the volume strength of 1.6 N H2O2 solution is = 8.96 Volume or Alternative method: Apply formula Volume strength = 5.6 × Normality = 5.6 × 1.6 = 8.96 (c) Heavy water (D2O) is extensively used as a moderator in nuclear reactors. |
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983. |
What do you meant by the term hydride? Discuss its different types. |
Answer» Hydrides: Dihydrogen combines with almost all elements except noble gases to form binary compounds under certain conditions. e. g. MgH2, B2H6 etc. Types of hydrides: The hydrides are classified into three categories- (i) Ionic Hydrides: These are stoichiometric compounds of dihydrogen formed with most of the s-block elements which are highly electropositive in nature. These are also called saline hydrides. e. g NaH, CaH2 etc (ii) Covalent Hydrides: These are stoichiometric compounds of dihydrogen formed with most of the p-block elements which have low electropositivity. These are also called molecular hydrides. eg. CH4, NH3,H2O,HF, etc (iii) Metallic Hydrides: These are non-stoichiometric compounds of dihydrogen formed with d-block and f-block elements. However, the metals of group 7, 8 and 9 do not form hydride. e. g LaH2.55, ZrH1.3−1.75 etc |
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984. |
What properties of water make useful as a solvent? |
Answer» It is water's chemical composition and physical attributes that make it such an excellent solvent. Water molecules have a polar arrangement of the oxygen and hydrogen atoms—one side (hydrogen) has a positive electrical charge and the other side (oxygen) had a negative charge. This allows the water molecule to become attracted to many other different types of molecules. Water can become so heavily attracted to a different molecule, like salt (NaCl), that it can disrupt the attractive forces that hold the sodium and chloride in the salt molecule together and, thus, dissolve it. |
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985. |
What is the difference between the terms `hydrolysis` and `hydration` ? |
Answer» Interaction of `H^(+) and OH^(-)` with the anion and the cation of a salt respectively original acid and the original base is called hydrolysis. For example, `underset("Salt")(Na_(2)CO_(3)) + 2H_(2)O to underset("Base")(2NaOH)+ underset("Acid")(H_(2)CO_(3))` Hydration, on the other hand, means addition of `H_(2)O` to ions or molecules to form hydrated ions on hydrated salts. For example, `underset("Salt")(Na^(+)Cl^(-)(s)) + H_(2)O(l) to Na^(+)(aq) + Cl^(-)(aq)` `underset("Colourless")(CuSO_(4)(s)) + 5H_(2)O(l) to underset("(Blue)")(CuSO_(4).5H_(2)O(s))` |
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986. |
What is hydride gap? |
Answer» Transition metals of group 3,4 and 5 from metallic hydrides. In group 6, chromium also form a hydride. Then there is a gap as te metals belonging to groups 7,8 and 9 do not form any hydrides. The gap is known as hydrides gap. | |
987. |
The term hydride gap refers to which region of periodic table?A. Groups 6 to 9B. groups 7 to 9C. groups 7 to 10D. groups 5 to 7 |
Answer» Correct Answer - B | |
988. |
What is the difference between terms hydrolysis and hydration? |
Answer» Hydrolysis: Breaking of a compund using water. Eg. NaCl + H2O →NaOH + HCl Hydration: Addition of a water molecule to a compound Eg. Hydration of ethane C2H4 + H2O → CH3CH2OH |
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989. |
`H_(2)O_(2)` acts as an oxidising agent inA. Neutral mediumB. Acidic mediumC. Alkaline mediumD. Acidic and alkaline medium |
Answer» Correct Answer - D `H_(2)O_(2)` acts as an oxidising agent in acidic and alkaline medium. |
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990. |
Which one of the following compounds gives methane on treatement with water?A. `Al_(4)C_(3)`B. `CaC_(2)`C. `VC`D. `SiC` |
Answer» Correct Answer - A `Al_(4)C_(3)+12H_(2)Orarr4Al(OH)_(3)+3CH_(4)` |
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991. |
Which of the following is not correct regarding the electroplytic perparation of `H_(2)O_(2)`?A. lead is used as cathodeB. `50% H_(2)SO_(4)` is usedC. Hydrogen is liberated at anodeD. sulphuric acid undergoes oxidation. |
Answer» Correct Answer - C See Comprehensive Review. |
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992. |
Write the two uses of interstitial hydrides? |
Answer» i. Interstitial hydrides are used in metallurgy, in manufacture of vacuum tubes. ii. Metallic or interstitial hydrides are used as reducing agents. |
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993. |
What type of elements form interstitial hydrides? |
Answer» d − and f − block elements. |
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994. |
`H_(2)O_(2)` acts as an oxidising agent inA. Neutral mediumB. Acidic mediumC. Alkaline mediumD. Acidic as well as alkaline medium |
Answer» Correct Answer - D `H_(2)O_(2)` can act as oxidising agent in acidic medium as well as basic medium. |
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995. |
Write two uses of interstitial hydrides. |
Answer» (i) For storing H2 and (ii) Catalyst of hydrogenation reactions. |
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996. |
Which of the following chemical reaction will not feasible?A. `PbO_(2)+dil.H_(2)SO_(4)rarrPbSO_(4)+H_(2)O+O_(2)`B. `H_(2)SO_(3)+H_(2)OrarrH_(2)SO_(4)+H_(2)O_(2)`C. `H_(2)O_(2)+N_(2)H_(4)rarrN_(2)+H_(2)O`D. `Ti(SO_(4))_(2)+H_(2)O_(2)+2H_(2)OrarrH_(2)TiO_(3)+H_(2)SO_(4)` |
Answer» Correct Answer - B `Ti(SO_($))_(2)+H_(2)O_(2)+H_(2)OrarrH_(2)TiO_(4)+H_(2)SO_(4)~ |
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997. |
Hydrogen can be produced by heatingA. Cu with `H_(2)SO_(4)`B. Sodium formateC. Sodium oxalateD. None of these |
Answer» Correct Answer - C `2HCOONararrNa_(2)CO_(3)+H_(2)` |
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998. |
What type of elements form interstitial hydrides ? |
Answer» d- and f-block elements | |
999. |
What is the geometry of the compound formed by group 14 to form molecular hydride? |
Answer» Tetrahedral in structure. |
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1000. |
Which of the properties of interstitial hydrides is correct ?A. They generally form non-stoichiometric speciesB. They give rise to metals fit for fabricationC. On thermal decomposition they afford a source of pure hydrogenD. They can be used as hydrogenation catalysts. |
Answer» Correct Answer - A See Comprehensive Review. |
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