1333 + Interview Questions in HYDROGEN IN GENERAL AWARENESS Page 12 InterviewSolution

551.	How ortho and para hydrogen are different?(a) Number of protons(b) Molecular mass(c) Direction of rotation of electron(d) Direction of rotation of proton
Answer» (d) Direction of rotation of proton

Discussion

552.	Which of the following statements are not true for hydrogen?(i) It exists as diatomic molecule.(ii) It has one electron in the outermost shell.(iii) It can lose an electron to form a cation which can freely exist(iv) It forms a large number of ionic compounds by losing an electron.
Answer» (iii, iv) It can lose an electron to form a cation which cannot freely exist. Generally, it does not form ionic compounds by losing an electron but forms a large number of covalent compounds by sharing electron.

Discussion

553.	Dihydrogen can be prepared on commercial scale by different methods. In its preparation by the action of steam on hydrocarbons, a mixture of CO and H2 gas is formed. It is known as ____________.(i) Water gas(ii) Syngas(iii) Producer gas(d) Industrial gas
Answer» (i, ii) A mixture of CO + H₂ is known as water gas or syn gas (synthesis gas).

Discussion

554.	One of the methods for the manufacture of `H_(2)O_(2)` involves electrolysis ofA. con. `H_(2)SO_(4)`B. An alkaline solutionC. con. HClD. 50% `H_(2)SO_(4)`
Answer» Correct Answer - D `50% H_(2)SO_(4)` first electrolysis then hydrolysis gives `H_(2)SO_(4) & H_(2)O_(2)`

Discussion

555.	Give two examples of Interstitial Hydrides.
Answer» Transition metal hydrides are called Interstitial Hydrides. T₁ H_1.8& T₁H₂ (non –stoichiometric hydrides).

555.

Give two examples of Interstitial Hydrides.

Answer»

Transition metal hydrides are called Interstitial Hydrides.

T₁ H_1.8& T₁H₂ (non –stoichiometric hydrides).

Discussion

556.	Tritium undergose radioactive decay givingA. `alpha` -particlesB. `beta` -particlesC. neutronsD. `gamma` -rays.
Answer» Correct Answer - B `._(1)^(3)Hto._(3)^(2)He+overset(0)(-1^(e))`

Discussion

557.	The decay product of tritium isA. `._(1)H^(1)`B. `._(1)H^(2)`C. `._(2)He^(4)`D. `._(2)He^(3)`
Answer» Correct Answer - D `._(1)H^(3)to._(3)^(2)He + overset(0)(-1^(e))`

Discussion

558.	Write true or false for each statement. Rewrite the false statements correctly.1. Lead reacts briskly with dilute hydrochloric acid to form hydrogen.2. Hydrogen does not combine with nitrogen under ordinary conditions.3. Copper reacts with hot water to form copper oxide and hydrogen.4. Hydrogen is a good oxidizing agent.
Answer» 1. False. Lead reacts very slowly with dilute hydrochloric acid to form hydrogen. 2. True 3. False. Copper does not react with water. 4. False. Hydrogen is a reducing agent.

558.

Write true or false for each statement. Rewrite the false statements correctly.1. Lead reacts briskly with dilute hydrochloric acid to form hydrogen.2. Hydrogen does not combine with nitrogen under ordinary conditions.3. Copper reacts with hot water to form copper oxide and hydrogen.4. Hydrogen is a good oxidizing agent.

Answer»

1. False.

Lead reacts very slowly with dilute hydrochloric acid to form hydrogen.

2. True

3. False.

Copper does not react with water.

4. False.

Hydrogen is a reducing agent.

Discussion

559.

MATCH THE COLUMNSColumn AColumn B1. 2H2 + O2 → 2H2O(a) This reaction is not possible.2. H2 + Cl2 → 2HCl(b) This reaction is exothermic to the extent of explosion.3. ZnO + H2 → Zn + H2O(c) This reaction is known as Haber process.4. Cu + H2SO4 → CuSO4 + H2(d) This reaction illustrates the reducing property of hydrogen.5. N2 + 3H2 → 2NH3 + heat(e) This reaction takes place in diffused sunlight.

Answer»

Column A	Column B
1. 2H₂ + O₂ → 2H₂O	(b) This reaction is exothermic to the extent of explosion.
2. H₂ + Cl₂ → 2HCl	(e) This reaction takes place in diffused sunlight.
3. ZnO + H₂ → Zn + H₂O	(d) This reaction illustrates the reducing property of hydrogen.
4. Cu + H₂SO₄→ CuSO₄ + H₂	(a) This reaction is not possible.
5. N₂ + 3H₂ → 2NH₃ + heat	(c) This reaction is known as Haber process.

Discussion

560.	Which of the following will determine whether the given colourless liquid is water or not ?A. meltingB. tastingC. phenolphthaleinD. adding a pinch if anhydrous `CuSO_(4)`.
Answer» Correct Answer - D Colourless anhydrous `CuCO_(4)` becomes blue on reaction with water.

Discussion

561.	Why is dihydrogen not preferred in balloons these days ?
Answer» Dihydrogen is highly combustible and hence is likely to catch fire in presence of excess of air

Discussion

562.	Why is dihydrogen not preferred in balloons?
Answer» Dihydrogen is highly combustible so it is likely to catch fire in the presence of excess of air. So, dihydrogen is not preferred in balloons.

Discussion

563.	Give one example for each: reaction of hydrogen with metal & Non metal.
Answer» 2Na +H₂----> 2 NaH H₂+ Cl₂-----> 2HCl (in the presence of light)

563.

Give one example for each: reaction of hydrogen with metal & Non metal.

Answer»

2Na +H₂----> 2 NaH

H₂+ Cl₂-----> 2HCl (in the presence of light)

Discussion

564.	Which of the following is incorrect statement ?A. s-bolck elements, execpet Be and Mg, from ionic hydrogenB. `BeH_(4), Mgh_(2),CuH_(2), ZnH_(2),CaH_(2) and HgH_(2) and HgH_(2) ` intermediate hydridesC. p-bolck elemets from covalent hydrideD. d and f-block element from inoic hydride
Answer» Correct Answer - D

Discussion

565.	Define Nascent hydrogen.
Answer» The hydrogen produced in contact with the substance to be reduced is known as 'nascent hydrogen‘. It is very reactive form of hydrogen Better reducing agent than ordinary dihydrogen.

Discussion

566.	Hydrogen can be fused to form helium atA. High temperature and high pressureB. high temperature and low pressureC. low temperature and high pressureD. low temperature and low pressure
Answer» Correct Answer - A A fusion reaction is difficult to occur because positively charged nuclei repel each other. At very high temperatures of the order of `10^(6)` to `10^(7)` the nuclei may have sufficient energy to overcome the repulsive forces and fuse. It is for this reason, fusion reactions are also called thermonuclear reactions. Hence, hydrogen can be fused to form helium at high temperature and high pressure.

Discussion

567.	What type of elements form interstitial hydrides?
Answer» Elements of d-and f-block.

Discussion

568.	State the Physical properties of Hydrogen peroxide.
Answer» Physical properties of Hydrogen peroxide In the pure state H₂O₂ is an almost colourless(very pale blue) liquid. H₂O₂ is miscible with water in all proportions and forms a hydrate H₂O₂.H₂O (mp 221 K). A 30% solution of H₂O₂ is marketed as 100 volume‘ hydrogen peroxide. It means that one millilitre of 30% H₂O₂ solution will give 100 V of oxygen at STP. Commercially, it is marketed as 10 V, which means it contains 3% H₂O₂.

568.

State the Physical properties of Hydrogen peroxide.

Answer»

Physical properties of Hydrogen peroxide

In the pure state H₂O₂ is an almost colourless(very pale blue) liquid.
H₂O₂ is miscible with water in all proportions and forms a hydrate H₂O₂.H₂O (mp 221 K).
A 30% solution of H₂O₂ is marketed as 100 volume‘ hydrogen peroxide. It means that one millilitre of 30% H₂O₂ solution will give 100 V of oxygen at STP. Commercially, it is marketed as 10 V, which means it contains 3% H₂O₂.

Discussion

569.	How heavy water is is obtained from ordinary water?
Answer» Heavy water is obtained from ordinary water by repeated electrolysis in the presence of 3% NaOH.

Discussion

570.	State four uses of hydrogen:
Answer» 1. Hydrogen with oxygen produces an oxy-hydrogen flame which is used for cutting and welding. 2. Hydrogen gas is used as a fuel. 3. Hydrogen is used for hydrogenation of vegetable oil. 4. Hydrogen gas is used extensively in the manufacture of ammonia gas, which is used to produce fertilizers.

570.

State four uses of hydrogen:

Answer»

1. Hydrogen with oxygen produces an oxy-hydrogen flame which is used for cutting and welding.

2. Hydrogen gas is used as a fuel.

3. Hydrogen is used for hydrogenation of vegetable oil.

4. Hydrogen gas is used extensively in the manufacture of ammonia gas, which is used to produce fertilizers.

Discussion

571.	Which one of the following is an electron deficient hydride? (a) C2H6 (b) B2H6 (c) GeH4 (d) CH4
Answer» Answer: (b) B₂H₆

Discussion

572.	What is syngas ? Why is it called so ?
Answer» Mixtures of CO and `H_(2)` is called syngas. It is so named because it is used for the synthesis of methanol and a number of hydrocarbons.

Discussion

573.	Discuss the use of hydrogen as a fuel.
Answer» Liquid hydrogen is used as a fuel in rockets and guided missiles. Hydrogen can also be used as a fuel in automobiles. Researches are being done to discover the use of hydrogen as an alternative source of energy in the future since this would cut down pollution also.

Discussion

574.	Which of the following will not displace hydrogen?A. BaB. PbC. HgD. Sn
Answer» (c ) Hg will not displace `H_(2)` as it lies below hydrogen in the electrochemical series

Discussion

575.	Discuss the occurrence of hydrogen in the universe and on the earth.
Answer» Hydrogen is the most abundant element on Earth. It is present in large amounts in stars and sun. In our atmosphere and Earth’s crust, it is found in very small amount. Hydrogen compounds are found abundantly e.g. acids, bases, and hydrocarbons. Nearly three fourth of the earth’s surface is covered with water which is formed from hydrogen itself.

Discussion

576.	What is hydrogenation?
Answer» Hydrogenation is a process in which vegetable oils are converted into fats on treating with hydrogen.

Discussion

577.	Write two physical properties of hydrogen.
Answer» Physical properties of hydrogen gas 1. It is a colorless, odorless and tasteless gas. 2. It is highly inflammable and bums with a blue flame.

577.

Write two physical properties of hydrogen.

Answer»

Physical properties of hydrogen gas

1. It is a colorless, odorless and tasteless gas.

2. It is highly inflammable and bums with a blue flame.

Discussion

578.	Hydrogen gas is collected by the downward displacement of water. Give reason.
Answer» Hydrogen gas is collected by the downward displacement of water because hydrogen gas is practically insoluble in water.

Discussion

579.	In the reaction `Ag_(2)O+H_(2)O_(2) rarr 2Ag+H_(2)O+O_(2)`,`H_(2)O_(2)` acts asA. reducing agentB. oxidising agentC. bleaching agentD. none of these.
Answer» Correct Answer - A

Discussion

580.	Which compounds are responsible for permanent and temporary hardness of water?
Answer» Permanent hardness is due to chlorides and sulphates of calcium and magnesium While temporary hardness is due to bicarbonates of calcium and magessium.

Discussion

581.	Hydrogen resemblesA. alkali metalsB. Noble gasesC. halogensD. carbon.
Answer» Correct Answer - A::C::D Hydrogen resemble group 1 (alkali metals), group 17 (halogens) and carbon.

Discussion

582.	The salt responsible for permanent hardness of `H_(2)O` isA. `Na_(2)SO_(4)`B. `Mg(HCO_(3))_(2)`C. NaClD. `MgCl_(2)`.
Answer» Correct Answer - D Hydrogen of active metals like NaH, `CaH_(2)` etc. are instant source of hydrogen of high purity. They react with water to from `H_(2)` gas. `CaH_(2)+H_(2)OtoCa(OH)_(2)+2H_(2)`

Discussion

583.	Which of the following is the correct order of increasing enthalpy of vaporisation ?A. `NH_(3) lt PH_(3) lt AsH_(3)`B. `ArH_(3) lt PH_(3) lt NH_(3)`C. `PH_(3) lt AsH_(3) lt NH_(3)`D. `NH_(3) lt AsH_(3) lt PH_(3)`
Answer» Correct Answer - C

Discussion

584.	Which one of the following statements is incorrect with regard to and para dihydrogen ?A. They are nuclear spin isomersB. The ortho isomer has zero nuclear spin whereas the para isomer has one nuclar spin.C. The para isomer is favoured at low temperature.D. It is never possible to obtain `100%` pure ortho isomer.
Answer» Correct Answer - B The spin of the proton in ortho hydrogen are in the same direction. In para hydrogen the protons spin in opposite direction.

Discussion

585.	Hydrogen combines with other elements byA. losing an electronB. gaining an electronC. Sharing an electronD. losing, gaining or sharing electron.
Answer» Correct Answer - D Hydrogen can loose one electron (e.g. , HF). It can gain one electron (e.g. , NaH), Hydrogen can also share one electron (e.g. , H-H).

Discussion

586.	The bleaching of `H_(2)O_(2)` are due to its :A. reducing propertiesB. oxidising propertiesC. unstable natureD. acidic nature
Answer» Correct Answer - B `H_(2)O_(2)rarrH_(2)O+[O]` [O]+ coloured matter `rarr` colourless matter

Discussion

587.	Hydrogen combines with other elements byA. Losing an electronB. Gaining an electronC. Sharing an electronD. Losing, gaining or sharing electron
Answer» Correct Answer - D Hydrogen can lose one electron `(e.g. HF)`. It can gain one electron `(e.g. NaH)`, hydrogen can also share one electron `(e.g. H-H)`.

Discussion

588.	A certain compound `(X)` when treated with copper sulphate solution yields a brown precipitate. On adding hypo solution the precipitate turns white. The compound isA. `K_2CO_3`B. KlC. KBrD. `K_3PO_4`
Answer» Correct Answer - B When potassium iodide is reacted with `CuSO_4` it gives iodine gas which is brown colour. This iodine gas which is brown colour. This iodine reacted with sodium thiosulphate and form white precipitate of sodium tetrathionate. `2CuSO_4 + 4KI to K_2SO_4 + I_2 uarr + 2CuI` `2Na_2S_2O_3 + I_2 to Na_2S_4O_6 darr + 2NaI`

Discussion

589.	Which of the following is the correct order of increasing enthalpy of vaporisation ?A. `NH_(3) lt PH_(3) lt AsH_(3)`B. `ArH_(3) lt PH_(3) lt NH_(3)`C. `PH_(3) lt As H_(3) lt NH_(3)`D. `NH_(3) lt As H_(3) lt PH_(3)`
Answer» Correct Answer - C Enthalpy of vaporisation `underset(b b(k)185.5)(PH_(3)) lt underset(210.6)(AsH_(3)) lt underset(238.5)(NH_(3))`

Discussion

590.	Which of the following is the correct order of increasing enthalpy of vaporisation ?A. `NH_(3)ltPH_(3)ltArH_(3)`B. `ArH_(3)ltPH_(3)ltNH_(3)`C. `PH_(3)ltArH_(3)ltNH_(3)`D. `NH_(3)ltArH_(3)ltPH_(3)`
Answer» Correct Answer - C Boiling points and hence enthalpy of vapourisation increases in the order `PH_(3)ltAsH_(3)ltNH_(3)`

Discussion

591.	The volume strength of `1*5` N `H_(2)O_(2)` solution is
Answer» `K_(2)S_(2)O_(8)+D_(2)O(l)tounderset("potassium sulphate")underset("Deuterated")(2KDSO_(4)(aq))+underset("hydrogen peroxide")underset("Deuterated")(D_(2)O_(2)(l))`

Discussion

592.	Limiting compositions of f-block hydrides areA. `MH_(2)` and `MH_(3)`B. `MH_(3)` and `MH_(5)`C. `MH_(2)` and `MH_(8)`D. `MH_(2)` and `MH_(6)`.
Answer» Correct Answer - A Limiting composition of f-block hydrides are `MH_(2)` and `MH_(3)`.

Discussion

593.	Hydrogen acts as an oxidising agnet in the reaction with `:`A. bromineB. calciumC. nitrogenD. sulphur
Answer» Correct Answer - B In the reaction with calcium hydrogen acts as an oxidising agent. `Ca+H_(2) rarr CaH_(2) (Ca_(2)+2H^(-))`

Discussion

594.	(i) Draw the gas phase and solid phase structure of `H_(2)O_(2)`. (ii) `H_(2)O_(2)` is a better oxidising agnet than water . Explain .
Answer» (ii) `H_(2)O_(2)` is a better oxidising agent than `H_(2)O` because unstable and releases oxygen readily to form more stable compound i.e. `H_(2)O` `2H_(2)O_(2) ot 2H_(2)O+O_(2),DeltaH=-196.0kJ` Therefore, it is better oxidisting agent than water.

Discussion

595.	In which of the following characteristics does hydrogen resemble halogens ?A. Hydrogen is the lighest gasB. H atoms contains one electron eachC. Hydrogen form ionic hydrides with alkali metalsD. Hydrogen has three isotopes.
Answer» Correct Answer - C H combines with alkali metals like halogens to form ionic hydride.

Discussion

596.	Which is false about ice?A. It has open cage-like structure.B. it has more density than water.C. Each `O` atom is surrounded by four `H` atomsD. Each `O` atom has four `H`-bonds around it.
Answer» Correct Answer - B::D

Discussion

597.	Which is false about ice?A. It has open cage like structure.B. It has less density than water.C. Each `O` atom is surrounded by four `H` atoms.D. Each `O` atom has four `H-` bonds around it.
Answer» Correct Answer - d Each oxygen atom attached with four hydrogen, two by covalent bonds and two hydrogen bonds in ice.

Discussion

598.	Water contracts on heating `:`A. to `100^(@)C`B. from `10^(#)C` to `20^(@)C`C. to `273K`D. from `0^(@)C` to `4^(@)C`
Answer» Correct Answer - d It is a fact.

Discussion

599.	Which is false about ice?A. It has open cage like structure.B. It has less density than water. C. Each `O` atom is surrounded by four `H` atoms.D. Each `O` atom has four `H-` bonds around it.
Answer» Correct Answer - d Each oxygen atom attached with four hydrogen, two by covalent bonds and two hydrogen bonds in ice.

Discussion

600.	The molecular formula of a commercial resin used for exchanging ions in wter softening is `C_(8)H_(7)SO_(3Na` (mol.wt.206), What would be the maximum uptake of `Ca^(2+)` ions by resin when expressed in moe per gram resin?A. `(2)/(309)`B. `(1)/(412)`C. `(1)/(103)`D. `(1)/(206)`
Answer» (b) `underset(2xx206=412g)underset(2"mol")(2C_(8)H_(7)SO_(3)^(-)Na^(+))+underset(1"mol")(Ca^(2+)) to (2C_(8)H_(7)SO_(3)^(-))_(2)Ca^(2+)+2Na^(+)` `"1 mole of" Ca^(2+)=412"g of resin"` `"Maximum uptake of" Ca^(2+) "ions by the resin" =(1"mol")/(412g)`

Discussion

Explore topic-wise InterviewSolutions in .

How ortho and para hydrogen are different?(a) Number of protons(b) Molecular mass(c) Direction of rotation of electron(d) Direction of rotation of proton

Which of the following statements are not true for hydrogen?(i) It exists as diatomic molecule.(ii) It has one electron in the outermost shell.(iii) It can lose an electron to form a cation which can freely exist(iv) It forms a large number of ionic compounds by losing an electron.

Dihydrogen can be prepared on commercial scale by different methods. In its preparation by the action of steam on hydrocarbons, a mixture of CO and H2 gas is formed. It is known as ____________.(i) Water gas(ii) Syngas(iii) Producer gas(d) Industrial gas

One of the methods for the manufacture of `H_(2)O_(2)` involves electrolysis ofA. con. `H_(2)SO_(4)`B. An alkaline solutionC. con. HClD. 50% `H_(2)SO_(4)`

Give two examples of Interstitial Hydrides.

Tritium undergose radioactive decay givingA. `alpha` -particlesB. `beta` -particlesC. neutronsD. `gamma` -rays.

The decay product of tritium isA. `._(1)H^(1)`B. `._(1)H^(2)`C. `._(2)He^(4)`D. `._(2)He^(3)`

Which of the following will determine whether the given colourless liquid is water or not ?A. meltingB. tastingC. phenolphthaleinD. adding a pinch if anhydrous `CuSO_(4)`.

Why is dihydrogen not preferred in balloons these days ?

Why is dihydrogen not preferred in balloons?

Give one example for each: reaction of hydrogen with metal &amp; Non metal.

Which of the following is incorrect statement ?A. s-bolck elements, execpet Be and Mg, from ionic hydrogenB. `BeH_(4), Mgh_(2),CuH_(2), ZnH_(2),CaH_(2) and HgH_(2) and HgH_(2) ` intermediate hydridesC. p-bolck elemets from covalent hydrideD. d and f-block element from inoic hydride

Define Nascent hydrogen.

Hydrogen can be fused to form helium atA. High temperature and high pressureB. high temperature and low pressureC. low temperature and high pressureD. low temperature and low pressure

What type of elements form interstitial hydrides?

State the Physical properties of Hydrogen peroxide.

How heavy water is is obtained from ordinary water?

State four uses of hydrogen:

Which one of the following is an electron deficient hydride? (a) C2H6 (b) B2H6 (c) GeH4 (d) CH4

What is syngas ? Why is it called so ?

Discuss the use of hydrogen as a fuel.

Which of the following will not displace hydrogen?A. BaB. PbC. HgD. Sn

Discuss the occurrence of hydrogen in the universe and on the earth.

What is hydrogenation?

Write two physical properties of hydrogen.

Hydrogen gas is collected by the downward displacement of water. Give reason.

In the reaction `Ag_(2)O+H_(2)O_(2) rarr 2Ag+H_(2)O+O_(2)`,`H_(2)O_(2)` acts asA. reducing agentB. oxidising agentC. bleaching agentD. none of these.

Which compounds are responsible for permanent and temporary hardness of water?

Hydrogen resemblesA. alkali metalsB. Noble gasesC. halogensD. carbon.

The salt responsible for permanent hardness of `H_(2)O` isA. `Na_(2)SO_(4)`B. `Mg(HCO_(3))_(2)`C. NaClD. `MgCl_(2)`.

Which of the following is the correct order of increasing enthalpy of vaporisation ?A. `NH_(3) lt PH_(3) lt AsH_(3)`B. `ArH_(3) lt PH_(3) lt NH_(3)`C. `PH_(3) lt AsH_(3) lt NH_(3)`D. `NH_(3) lt AsH_(3) lt PH_(3)`

Hydrogen combines with other elements byA. losing an electronB. gaining an electronC. Sharing an electronD. losing, gaining or sharing electron.

The bleaching of `H_(2)O_(2)` are due to its :A. reducing propertiesB. oxidising propertiesC. unstable natureD. acidic nature

Hydrogen combines with other elements byA. Losing an electronB. Gaining an electronC. Sharing an electronD. Losing, gaining or sharing electron

A certain compound `(X)` when treated with copper sulphate solution yields a brown precipitate. On adding hypo solution the precipitate turns white. The compound isA. `K_2CO_3`B. KlC. KBrD. `K_3PO_4`

Which of the following is the correct order of increasing enthalpy of vaporisation ?A. `NH_(3) lt PH_(3) lt AsH_(3)`B. `ArH_(3) lt PH_(3) lt NH_(3)`C. `PH_(3) lt As H_(3) lt NH_(3)`D. `NH_(3) lt As H_(3) lt PH_(3)`

Which of the following is the correct order of increasing enthalpy of vaporisation ?A. `NH_(3)ltPH_(3)ltArH_(3)`B. `ArH_(3)ltPH_(3)ltNH_(3)`C. `PH_(3)ltArH_(3)ltNH_(3)`D. `NH_(3)ltArH_(3)ltPH_(3)`

The volume strength of `1*5` N `H_(2)O_(2)` solution is

Limiting compositions of f-block hydrides areA. `MH_(2)` and `MH_(3)`B. `MH_(3)` and `MH_(5)`C. `MH_(2)` and `MH_(8)`D. `MH_(2)` and `MH_(6)`.

Hydrogen acts as an oxidising agnet in the reaction with `:`A. bromineB. calciumC. nitrogenD. sulphur

(i) Draw the gas phase and solid phase structure of `H_(2)O_(2)`. (ii) `H_(2)O_(2)` is a better oxidising agnet than water . Explain .

In which of the following characteristics does hydrogen resemble halogens ?A. Hydrogen is the lighest gasB. H atoms contains one electron eachC. Hydrogen form ionic hydrides with alkali metalsD. Hydrogen has three isotopes.

Which is false about ice?A. It has open cage-like structure.B. it has more density than water.C. Each `O` atom is surrounded by four `H` atomsD. Each `O` atom has four `H`-bonds around it.

Which is false about ice?A. It has open cage like structure.B. It has less density than water.C. Each `O` atom is surrounded by four `H` atoms.D. Each `O` atom has four `H-` bonds around it.

Water contracts on heating `:`A. to `100^(@)C`B. from `10^(#)C` to `20^(@)C`C. to `273K`D. from `0^(@)C` to `4^(@)C`

Which is false about ice?A. It has open cage like structure.B. It has less density than water. C. Each `O` atom is surrounded by four `H` atoms.D. Each `O` atom has four `H-` bonds around it.

The molecular formula of a commercial resin used for exchanging ions in wter softening is `C_(8)H_(7)SO_(3Na` (mol.wt.206), What would be the maximum uptake of `Ca^(2+)` ions by resin when expressed in moe per gram resin?A. `(2)/(309)`B. `(1)/(412)`C. `(1)/(103)`D. `(1)/(206)`

Give one example for each: reaction of hydrogen with metal & Non metal.