1333 + Interview Questions in HYDROGEN IN GENERAL AWARENESS Page 17 InterviewSolution

801.	Give any two similarities of hydrogen with group-I elements?
Answer» (a) Hydrogen atom has one valence electron similar to alkali metal atoms of group-I (b) Hydrogen can lose valence electron to form unipositive ion, which is similar to alkali metals which also loses their valence electron forming alkali metal ion.

801.

Give any two similarities of hydrogen with group-I elements?

Answer»

(a) Hydrogen atom has one valence electron similar to alkali metal atoms of group-I

(b) Hydrogen can lose valence electron to form unipositive ion, which is similar to alkali metals which also loses their valence electron forming alkali metal ion.

Discussion

802.	What is water-gas shift reaction?
Answer» A reaction in which production of dihydrogen can be increased can be increased by reacting CO of syn gas mixture with steam in the presence of iron chromate catalyst is called water gas shift reaction. Equation: CO + H₂O→CO₂ + H₂

802.

What is water-gas shift reaction?

Answer»

A reaction in which production of dihydrogen can be increased can be increased by reacting CO of syn gas mixture with steam in the presence of iron chromate catalyst is called water gas shift reaction.

Equation: CO + H₂O→CO₂ + H₂

Discussion

803.	Give the laboratory method of preparing dihydrogen?
Answer» Hydrogen is prepared in laboratory by action of zinc with dil. HCl Equation: Zn + 2HCl → ZnCl₂ + H₂

803.

Give the laboratory method of preparing dihydrogen?

Answer»

Hydrogen is prepared in laboratory by action of zinc with dil. HCl

Equation: Zn + 2HCl → ZnCl₂ + H₂

Discussion

804.	Which of the following is laboratory preparation of dihydrogen?A. `3Fe + 4H_(2)O(steam) rarr Fe_(3) O_(4) + 4H_(2)`B. `2Na + 2H_(2)O rarr Ca(OH)_(2) + 2H_(2)`C. `CaH_(2) + 2H_(2)O rarr Ca (OH)_(2) + 2H_(2)`D. `Zn + H_(2)SO_(4)(dil.) rarr ZnSO_(4) + H_(2)`
Answer» Correct Answer - D In laboratory, hydrogen gas is prepared by action of dilute `H_(2)SO_(4)` on granulated zinc. `Zn+H_(2)SO_(4)(dil.)to ZnSO_(4)+H_(2)`

Discussion

805.	Which of the following is not true ?A. Ordinary water is electrolysed more rapidly than `D_(2)O`B. Reaction between `H_(2)` and `Cl_(2)` is much faster than `D_(2)` and `Cl_(2)`C. `D_(2)O` freezes at lower temperature than `H_(2)O`D. Bond dissocition energy for `D_(2)` is greater than `H_(2)`.
Answer» Correct Answer - C `D_(2)O` actually has higher freezing point `(3.8^(@)C)` than water `H_(2)O(0^(@)C)`.

Discussion

806.	Elements hydrogen reacts with other substances only slowly at room temperature. Why?
Answer» In the elementary state, hydrogen exists in diatomic form i.e. as `H_(2)(g)` and the two hydrogen atoms are linked to each other by single covalent bond (H-H). Since the bond dissociation energy is very high `(435.9kJ mol^(-1))`, therefore, bond cleavage is extremely difficult. As a result, elemtal hydrogen is little reactive at room temperature.

Discussion

807.	Which one of the following will produce permanent hardness in water ?a) Sodium sulphateb) Calcium carbonatec) Calcium sulphated) Magnesium carbonate
Answer» c) Calcium sulphate

Discussion

808.	What are the ways in which water molecules are bonded to an anhydrous salt to form a hydrate?
Answer» Co-ordinate bond and H-bond

Discussion

809.	Polyphosphates are used for softening agents because theyA. Form solube complexes with anionic speciesB. Precipitate anionic speciesC. Form soluble complexes with cationic speciesD. Precipitate cationic species
Answer» Correct Answer - C Form soluble complexes with cationic species.

Discussion

810.	Speed of decomposition of `H_(2)O_(2)` is reduced by :A. `Na_(2)CO_(3)`B. `NaOH`C. AlcoholD. Pt.
Answer» Correct Answer - C Alcohol.

Discussion

811.	How is heavy water produced from ordinary water?
Answer» It is obtained by repeated electrolysis of ordinary water.

Discussion

812.	Metal(s) generally obtained by the reduction of their oxides with `H_(2)` areA. Al, ZnB. Mo, WC. Na, KD. Ca, Mg.
Answer» Correct Answer - B Molybdenum (Mo) and trugesten (W) are obtained by the reduction of their oxides with hydrogen.

Discussion

813.	The strenght of an poxo acid (E - 0 - H), where E is the central atom , depends upon theA. electronegativity of EB. atomic size of EC. ability of E to share electron pair with OD. atomic size and electronegativity of E
Answer» Correct Answer - A Higher electronegativity reduces the strength of acid.

Discussion

814.	Water obtained by purification with organic ion exchange resins isA. Pure waterB. Free from only `Ca^(@+, Mg^(2+)` ionsC. Free from `HCO_(3)^(-), SO_(4)^(2-) ` and `Cl^(-)` ions onlyD. None of these
Answer» Correct Answer - d Water obtained from organic ion `-` exchange resins is free from all ionic impurites.

Discussion

815.	A sample of water containing some dissolved table sugar and common salt is passed through organic ion exchange resins. The resulting water will beA. testelessB. sweetC. saltyD. None of these.
Answer» Correct Answer - B Organic ion exchange resins can remove only ionic impurities.

Discussion

816.	The shape of water molecule is same as that ofA. `C_(2)H_(2)`B. `CO_(2)`C. `NH_(3)`D. `Cl_(2)O`
Answer» Correct Answer - d

Discussion

817.	Which statement about zeolite is false ?A. They are used as cation exchangersB. They have open structure which enables them to take up small moleculesC. Zeolites are aluminosilicates having three dimensional networkD. None of the `SiO_(4)^(4-)` units are replaced by `AlO_(4)^(5-)` and `AlO_(6)^(9-)` ions in zeolites.
Answer» Correct Answer - D Zeolites have `SiO_(4)^(4-)` and `AlO_(4)^(5-)` tetrahedron, linked together in a three dimensional open structure in which four or six membered rings predominate. Due to open chain structure, they have cavities and can take up water and small molecules.

Discussion

818.

Distinguish clearly between temporary hardness and permanent hardness.

Answer»

Temporary hardness	Permanent hardness
1. It is caused by bicarbonates of Ca²⁺ and Mg²⁺	1. It is due to chlorides and sulphates of Ca²⁺ and Mg²⁺
2. It is removed by boiling.	2. It is removed by heating with washing soda.

Discussion

819.	Whivh statement about zeolite is false ?A. They are used as cation exchangerB. They have open structure which enables them to take up small moleculesC. Zeolites are alumino silicates having three dimensional networksD. Some of the `SiO_(4)^(4-)` units are replaced by `AlO_(4)^(5-)` and `AlO_(6)^(9-)` ions in zeolites
Answer» Correct Answer - d As `(a)`, (b)` and `(c)` are characteristic of zeolites.

Discussion

820.	Dicuss the position of hydrogen in periodic table?
Answer» (i) Hydrogen can be placed in gr. 1 as well as gr. (ii) Hydrogen shares many similarities with alkali metals, i.e. elements in group I-A. This is one of the factors that dictates the position of hydrogen in the table.(some properties like electronic configuration, forms halides, reducing agent). (iii) Hydrogen shares many similar properties with halogens like electronegativity, diatomic molecules, covalent bonds.

820.

Dicuss the position of hydrogen in periodic table?

Answer»

(i) Hydrogen can be placed in gr. 1 as well as gr.

(ii) Hydrogen shares many similarities with alkali metals, i.e. elements in group I-A. This is one of the factors that dictates the position of hydrogen in the table.(some properties like electronic configuration, forms halides, reducing agent).

(iii) Hydrogen shares many similar properties with halogens like electronegativity, diatomic molecules, covalent bonds.

Discussion

821.	30 Volume of H2O2 meansa) 30% H2O2 b)30 cm3 of the solution contains 1 gm of H2O2c)1 cm3 of solution liberates 30 cm3 of O2 at STPd) 30 cm3 of solution contains 1 mol of H2O2
Answer» c)1 cm³ of solution liberates 30 cm³ of O₂ at STP

Discussion

822.	Which is true statement about `D_(2)O` and `H_(2)O` ?A. `D_(2)O` has lower dielectric constant than `H_(2)O`B. `NaCl` is more soluble in `D_(2)O` than in `H_(2)O`C. Both are correctD. None of these
Answer» Correct Answer - A `H_(2)` has higher dielectric constant than `D_(2)O` . `H_(2)O` Dielectric constant `=(81)` `D_(2)o` Dielectric constant `=(60)` Dielectric constant `prop` good solvent.

Discussion

823.	Hydrogen acts as an oxidising agent in the reaction with `:`A. `Br_(2)`B. `Ca`C. `N_(2)`D. `S`
Answer» Correct Answer - b `Ca` is more electropositive than. `H` `i.e.` Hydrogen accepts `e^(-)` `i.e.` oxidising agent show reduction.

Discussion

824.	Out of the following metals which will give `H_(2)` on reaction with `NaOH:` `I: Zn,` ,`II:Mg`, `III: Al,`,`IV:Be`A. `I,II,III,IV`B. `I,III,IV`C. `II,IV`D. `I,III`
Answer» Correct Answer - B In `II A `group only `Be` gives `H_(2)` gas with alkaline solution other alkaline eath metals don’t react. `Be+2NaOH+2H_(2)O rarr Na_(2)BaO_(2).2H_(2)O+H_(2)`

Discussion

825.	Which of the following can adsorb largest volume of hydrogen gas ?A. Finely divided platinumB. Finely divided nikelC. Colloidal palladiumD. Colloidal platinum.
Answer» Correct Answer - C Order of adsorption of `H_(2)` (occulsion) is Colloidal Palladium `gt "Palladium" gt "Platinum" gt ........"Gold" gt "Nickel"`.

Discussion

826.	Which of the following statements is correct ?A. Elements of group 15 from electron deficient hydrides.B. All elements of group 14 from electron deficient hydridesC. Electron precise hydrides have tetrahedral geometriesD. Electron rich hydrides can act as Lewis acids.
Answer» Correct Answer - C::D Electrons precise compouds have the required number of electrons to write their convention Lewis structures. All elements of group 14 from electron-precise compounds (e.g..,`CH_(4)`) which are teterahedral in gemoetry .

Discussion

827.	Match List I with List II and select the correct answer using the codes given below the list : `{:(,"List I","List II",),(1.,"Heavy water",(a)"Bicarbonates of Mg and Ca in water",),(2.,"Temporary hard water",(b)"No foreign ions in water",),(3.,"Soft water",(c)D_(2)O,),(4.,"Permanent hard water",(d)"Sulphates and chlorides of Mg and Ca in water.",):}`A. 1-c,2-d.3.b,4-aB. 1-b,2-a,3-c,4-dC. 1-b2-d,3-c,4-aD. 1-c,2-a,3-b.4-d
Answer» Correct Answer - D

Discussion

828.	Hydrogen from `HCl` can be prepared byA. `Mg`B. `Cu`C. `P`D. `Pt`
Answer» Correct Answer - a `Mg+2HCl rarr MgCl_(2) + H_(2) uarr`.

Discussion

829.	Heavy water isA. `H_(2).^(18)O`B. Water obtained by repeted distillationC. `D_(2)O`D. Water at `4^(@)C`
Answer» Correct Answer - C

Discussion

830.	Hydrogen from `HCl` can be prepared byA. MgB. CuC. PD. Pt.
Answer» Correct Answer - A P, Pt and Cu do not give hydrogen with HCl.

Discussion

831.	Permutit is technical name given toA. Aluminates of Ca and NaB. Hydrated silicates of Al and NaC. Silicates of Ca and NaD. Silicates of Ca and Mg
Answer» Correct Answer - B

Discussion

832.	Excess of Kl and dill. `H_(2)SO_(4)` were mixed in 50 mL `H_(2)O_(2)`. Thus, `l_(2)` liberated requires 20 mL of 0.1 N `Na_(2)S_(2)O_(3)`. What will be the strenght of `H_(2)O_(2)` in g `L^(-1)` ?A. 0.034B. 0.68C. 6.8D. 5.8
Answer» Correct Answer - B For 20 m L of `H_(2)O_(2)` `Meq. Kof kI = Meq. of H_(2)O_(2) in 50 mL = Meq. Of Na_(2) S_(2) O_(3)` `(Wxx 100)/(34//2)= 20 xx 0.1` `therefore W_(H_(2)O_(2))" in" 50 mL` = `(20 xx 0.1 xx 34)/(2000)= 0.034` `therefore W_(H_(2)O_(2))" in " 1000 mL` = `(0.034 xx 1000)/(50)= 0.68g//L`

Discussion

833.	Hydrogen from `HCl` can be prepared byA. CuB. PC. MgD. Hg
Answer» Correct Answer - C

Discussion

834.	20mL of sample of `H_(2)O_(2)` gives 400mL of oxygen measured at NTP. The sample should be labelled as:A. 5 vol. `H_(2)O_(2)`B. dil. `H_(2)O_(2)`.C. anhydrous `H_(2)O_(2)`D. 20 vol. `H_(2)O_(2)`
Answer» Correct Answer - d

Discussion

835.	The species that does not contain peroxide bond is //are :A. `PbO_(2)`B. `H_(2)O_(2)`C. `SrO_(2)`D. `BaO_(2)`
Answer» Correct Answer - a `PbO_(2)` does not contain `-O-O` bond. It is lead dioxide.

Discussion

836.	False statement for H atom -A. It resembles halogens in some propertiesB. It resembles alkali metals in some propertyC. It can not be placed `I^(st)` group in tableD. It can be placed in `17^(th)` group of periodic table
Answer» Correct Answer - C

Discussion

837.	Which of the following cannot be oxidised by `H_(2)O_(2)` ?A. PbSB. `O_(3)(g)`C. `Na_(2)SO_(3)(aq)`D. `KI(aq)`.
Answer» Correct Answer - B `H_(2)O_(2)` cannot oxidise `O_(3).O_(3)` is a stronger oxidising agent than `H_(2)O_(2)` as such `H_(2)O_(2)` cannot oxidise `O_(3)`. In the reaction, `O_(3)+H_(2)O_(2)to2O_(2)+H_(2)O` `H_(2)O_(2)` is oxidised and `O_(3)` is reduced.

Discussion

838.	1 ml of `H_(2)O_(2)` solution given 10 ml of `O_(2)` at NTP. It is :A. 10 vol. `H_(2)O_(2)`B. 20 vol. `H_(2)O_(2)`C. 30 vol. `H_(2)O_(2)`D. 40 vol. `H_(2)O_(2)`
Answer» Correct Answer - A 10 volumes of `H_(2)O_(2)` mean 10 ml. Of `O_(2)` is obtained from 1 ml. of `H_(2)O_(2)`

Discussion

839.	Which one of the following is used for reviving the exhusated permutit ?A. HCl soltuionB. `10% CaCl_(2)` solutionC. `10% Mgl_(2)` SolutionD. `10% `NaCl solution
Answer» Correct Answer - D

Discussion

840.	Which substance does not speed up to decomposition of `H_(2)O_(2)` ?A. GlycerolB. PtC. GoldD. `MnO_(2)`.
Answer» Correct Answer - A Glycerol, phosphoric acid or acetanilide is added to `H_(2)O_(2)` to check its decomposition.

Discussion

841.	Which of the following cannot be oxidised by `H_(2)O_(2)` ?A. `O_(3)`B. Kl/HClC. PbSD. `Na_(2)SO_(3)`.
Answer» Correct Answer - A `H_(2)O_(2)` reduces `O_(3)` to `O_(2)` `O_(3)+H_(2)O_(2)toH_(2)O+20_(2)`

Discussion

842.	The decomposition of `H_(2)O_(2)` can be checked by addition ofA. alkali metal oxidesB. benzeneC. acetanilideD. `MnO_(2)`
Answer» Correct Answer - C C

Discussion

843.	Which substance does not speed up to decomposition of `H_(2)O_(2)` ?A. GlycerolB. `Pt`C. GoldD. `MnO_(2)`
Answer» Correct Answer - a Glycerol, phosphoric acid or acetanilide is added to `H_(2)O_(2)` to check its decomposition.

Discussion

844.	Which subtance cannot be reduced by `H_(2)O_(2)`A. `KMnO_(4)//H_(2)SO_(4)`B. `K_(2)Cr_(2)O_(7)//H_(2)SO_(4)`C. `Ag_(2)O`D. `Fe^(3+)`.
Answer» Correct Answer - D `Fe^(3+)` can not be reduced by `H_(2)O_(2)` while all other get reduced.

Discussion

845.	Which subtance cannot be reduced by `H_(2)O_(2)`A. `Ag_(2)O`B. `Fe_(^(3+)`C. Acidified `KMnO_(4)`D. Acidified `K_(2)Cr_(2)O_(7)`.
Answer» Correct Answer - B `H_(2)O_(2)` cannot reduce and `F^(3+)`. All other compounds are reduced by `H_(2)O_(2)`.

Discussion

846.	In the laboratory, `H_(2)O_(2)` is prepared by the action ofA. `MnO_(2)` is added to dilute cold `H_(3)PO_(4)`B. `BaO_(2)` is added to `CO_(2)` bubbling through cold waterC. `PbO_(2)` is added to an acidicied solution of `KMnO_(4)`D. `Na_(2)O_(2)` is added to boiling water
Answer» Correct Answer - B By `BaO_(2)`.

Discussion

847.	In the laboratory `H_(2)`O_(2)` is prepared by the action of:A. cold dilute `H_(2)SO_(4)` on hydrated `BaO_(2)`B. dil. HCl on `MnO_(2)`C. cold `H_(2)SO_(4)` on `MnO_(2)`D. aqueous alkali on `Na_(2)O_(3)`
Answer» Correct Answer - A `BaO_(2)+dilH_(2)SO_(4)rarrH_(2)O_(3)+BaSO_(4)downarrow`

Discussion

848.	Which subtance cannot be reduced by `H_(2)O_(2)`A. `KMnO_(4) // H_(2)SO_(4)`B. `K_(2)Cr_(2)o_(7) // H_(2)SO_(4)`C. `Ag_(2)O`D. `Re^(3+)`
Answer» Correct Answer - d `Fe^(+3)` cannot be reduced by `H_(2)O_(2)` while all other get reduced.

Discussion

849.	Which is the lightest gas ?A. NitrogenB. HeliumC. OxygenD. Hydrogen
Answer» Correct Answer - D

Discussion

850.	In the laboratory, `H_(2)O_(2)` is prepared by the action ofA. Cold `H_(2)SO_(4)` on `BaO_(2)`B. Aqueous alkali on `Na_(2)O_(2)`C. `MnO_(2)` and cold `H_(2)SO_(4)`D. Dilute HCl and `MnO_(2)`
Answer» Correct Answer - A

Discussion

Explore topic-wise InterviewSolutions in .

Give any two similarities of hydrogen with group-I elements?

What is water-gas shift reaction?

Give the laboratory method of preparing dihydrogen?

Which of the following is laboratory preparation of dihydrogen?A. `3Fe + 4H_(2)O(steam) rarr Fe_(3) O_(4) + 4H_(2)`B. `2Na + 2H_(2)O rarr Ca(OH)_(2) + 2H_(2)`C. `CaH_(2) + 2H_(2)O rarr Ca (OH)_(2) + 2H_(2)`D. `Zn + H_(2)SO_(4)(dil.) rarr ZnSO_(4) + H_(2)`

Which of the following is not true ?A. Ordinary water is electrolysed more rapidly than `D_(2)O`B. Reaction between `H_(2)` and `Cl_(2)` is much faster than `D_(2)` and `Cl_(2)`C. `D_(2)O` freezes at lower temperature than `H_(2)O`D. Bond dissocition energy for `D_(2)` is greater than `H_(2)`.

Elements hydrogen reacts with other substances only slowly at room temperature. Why?

Which one of the following will produce permanent hardness in water ?a) Sodium sulphateb) Calcium carbonatec) Calcium sulphated) Magnesium carbonate

What are the ways in which water molecules are bonded to an anhydrous salt to form a hydrate?

Polyphosphates are used for softening agents because theyA. Form solube complexes with anionic speciesB. Precipitate anionic speciesC. Form soluble complexes with cationic speciesD. Precipitate cationic species

Speed of decomposition of `H_(2)O_(2)` is reduced by :A. `Na_(2)CO_(3)`B. `NaOH`C. AlcoholD. Pt.

How is heavy water produced from ordinary water?

Metal(s) generally obtained by the reduction of their oxides with `H_(2)` areA. Al, ZnB. Mo, WC. Na, KD. Ca, Mg.

The strenght of an poxo acid (E - 0 - H), where E is the central atom , depends upon theA. electronegativity of EB. atomic size of EC. ability of E to share electron pair with OD. atomic size and electronegativity of E

Water obtained by purification with organic ion exchange resins isA. Pure waterB. Free from only `Ca^(@+, Mg^(2+)` ionsC. Free from `HCO_(3)^(-), SO_(4)^(2-) ` and `Cl^(-)` ions onlyD. None of these

A sample of water containing some dissolved table sugar and common salt is passed through organic ion exchange resins. The resulting water will beA. testelessB. sweetC. saltyD. None of these.

The shape of water molecule is same as that ofA. `C_(2)H_(2)`B. `CO_(2)`C. `NH_(3)`D. `Cl_(2)O`

Distinguish clearly between temporary hardness and permanent hardness.

Dicuss the position of hydrogen in periodic table?

30 Volume of H2O2 meansa) 30% H2O2 b)30 cm3 of the solution contains 1 gm of H2O2c)1 cm3 of solution liberates 30 cm3 of O2 at STPd) 30 cm3 of solution contains 1 mol of H2O2

Which is true statement about `D_(2)O` and `H_(2)O` ?A. `D_(2)O` has lower dielectric constant than `H_(2)O`B. `NaCl` is more soluble in `D_(2)O` than in `H_(2)O`C. Both are correctD. None of these

Hydrogen acts as an oxidising agent in the reaction with `:`A. `Br_(2)`B. `Ca`C. `N_(2)`D. `S`

Out of the following metals which will give `H_(2)` on reaction with `NaOH:` `I: Zn,` ,`II:Mg`, `III: Al,`,`IV:Be`A. `I,II,III,IV`B. `I,III,IV`C. `II,IV`D. `I,III`

Which of the following can adsorb largest volume of hydrogen gas ?A. Finely divided platinumB. Finely divided nikelC. Colloidal palladiumD. Colloidal platinum.

Which of the following statements is correct ?A. Elements of group 15 from electron deficient hydrides.B. All elements of group 14 from electron deficient hydridesC. Electron precise hydrides have tetrahedral geometriesD. Electron rich hydrides can act as Lewis acids.

Hydrogen from `HCl` can be prepared byA. `Mg`B. `Cu`C. `P`D. `Pt`

Heavy water isA. `H_(2).^(18)O`B. Water obtained by repeted distillationC. `D_(2)O`D. Water at `4^(@)C`

Hydrogen from `HCl` can be prepared byA. MgB. CuC. PD. Pt.

Permutit is technical name given toA. Aluminates of Ca and NaB. Hydrated silicates of Al and NaC. Silicates of Ca and NaD. Silicates of Ca and Mg

Excess of Kl and dill. `H_(2)SO_(4)` were mixed in 50 mL `H_(2)O_(2)`. Thus, `l_(2)` liberated requires 20 mL of 0.1 N `Na_(2)S_(2)O_(3)`. What will be the strenght of `H_(2)O_(2)` in g `L^(-1)` ?A. 0.034B. 0.68C. 6.8D. 5.8

Hydrogen from `HCl` can be prepared byA. CuB. PC. MgD. Hg

20mL of sample of `H_(2)O_(2)` gives 400mL of oxygen measured at NTP. The sample should be labelled as:A. 5 vol. `H_(2)O_(2)`B. dil. `H_(2)O_(2)`.C. anhydrous `H_(2)O_(2)`D. 20 vol. `H_(2)O_(2)`

The species that does not contain peroxide bond is //are :A. `PbO_(2)`B. `H_(2)O_(2)`C. `SrO_(2)`D. `BaO_(2)`

False statement for H atom -A. It resembles halogens in some propertiesB. It resembles alkali metals in some propertyC. It can not be placed `I^(st)` group in tableD. It can be placed in `17^(th)` group of periodic table

Which of the following cannot be oxidised by `H_(2)O_(2)` ?A. PbSB. `O_(3)(g)`C. `Na_(2)SO_(3)(aq)`D. `KI(aq)`.

1 ml of `H_(2)O_(2)` solution given 10 ml of `O_(2)` at NTP. It is :A. 10 vol. `H_(2)O_(2)`B. 20 vol. `H_(2)O_(2)`C. 30 vol. `H_(2)O_(2)`D. 40 vol. `H_(2)O_(2)`

Which one of the following is used for reviving the exhusated permutit ?A. HCl soltuionB. `10% CaCl_(2)` solutionC. `10% Mgl_(2)` SolutionD. `10% `NaCl solution

Which substance does not speed up to decomposition of `H_(2)O_(2)` ?A. GlycerolB. PtC. GoldD. `MnO_(2)`.

Which of the following cannot be oxidised by `H_(2)O_(2)` ?A. `O_(3)`B. Kl/HClC. PbSD. `Na_(2)SO_(3)`.

The decomposition of `H_(2)O_(2)` can be checked by addition ofA. alkali metal oxidesB. benzeneC. acetanilideD. `MnO_(2)`

Which substance does not speed up to decomposition of `H_(2)O_(2)` ?A. GlycerolB. `Pt`C. GoldD. `MnO_(2)`

Which subtance cannot be reduced by `H_(2)O_(2)`A. `KMnO_(4)//H_(2)SO_(4)`B. `K_(2)Cr_(2)O_(7)//H_(2)SO_(4)`C. `Ag_(2)O`D. `Fe^(3+)`.

Which subtance cannot be reduced by `H_(2)O_(2)`A. `Ag_(2)O`B. `Fe_(^(3+)`C. Acidified `KMnO_(4)`D. Acidified `K_(2)Cr_(2)O_(7)`.

In the laboratory, `H_(2)O_(2)` is prepared by the action ofA. `MnO_(2)` is added to dilute cold `H_(3)PO_(4)`B. `BaO_(2)` is added to `CO_(2)` bubbling through cold waterC. `PbO_(2)` is added to an acidicied solution of `KMnO_(4)`D. `Na_(2)O_(2)` is added to boiling water

In the laboratory `H_(2)`O_(2)` is prepared by the action of:A. cold dilute `H_(2)SO_(4)` on hydrated `BaO_(2)`B. dil. HCl on `MnO_(2)`C. cold `H_(2)SO_(4)` on `MnO_(2)`D. aqueous alkali on `Na_(2)O_(3)`

Which subtance cannot be reduced by `H_(2)O_(2)`A. `KMnO_(4) // H_(2)SO_(4)`B. `K_(2)Cr_(2)o_(7) // H_(2)SO_(4)`C. `Ag_(2)O`D. `Re^(3+)`

Which is the lightest gas ?A. NitrogenB. HeliumC. OxygenD. Hydrogen

In the laboratory, `H_(2)O_(2)` is prepared by the action ofA. Cold `H_(2)SO_(4)` on `BaO_(2)`B. Aqueous alkali on `Na_(2)O_(2)`C. `MnO_(2)` and cold `H_(2)SO_(4)`D. Dilute HCl and `MnO_(2)`