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451.

Sodium has as compared potassiumA. Less electropsitive characterB. Less densityC. Less ionisation potentialD. Lower melting point

Answer» Correct Answer - A
Discussion
452.

Sodium ……. As compared to pstassiumA. Less electronegativityB. More ionisation potentialC. Large atomic radiusD. Lower melting point

Answer» Correct Answer - B
Discussion
453.

As compared to lithium, sodium reacts quickly with water becauseA. Its molecular weight is lessB. It is stronger electronegativeC. It is stronger electropositiveD. It is a metal

Answer» Correct Answer - C
On moving down the group electropositive character increase.
Discussion
454.

Amongst the following hydroxides, the one which has the lowest value of `K_(sp)` is:A. `Mg (OH)_(2)`B. `Ca(OH)_(2)`C. `Ba(OH)_(2)`D. `Be(OH)_(2)`

Answer» Correct Answer - D
`Be(OH)_(2)` is least ionic and has lowest solubility product.
Discussion
455.

The correct order of solubility of the following compounds in water isA. `Ba(OH)_(2) lt Mg(OH)_(2)`B. `BaCO_(3) gt CaCO_(3)`C. `Ca(OH)_(2)=Mg(OH)_(2)`D. `CaSO_(4) lt MgSO_(4)`

Answer» Correct Answer - B
Solubility of group `II` hydroxides, sulphates and carbonates increases down group.
Discussion
456.

Sodium carbonate is treated with acids to from ……gasA. Carbon dioxideB. Carbon monxideC. HydrogenD. Oxygen

Answer» Correct Answer - A
Discussion
457.

On heating baking soda the compounds formed areA. `Na_(2)CO_(3)`B. `CO_(2)`C. `Na_(2)CO_(3),CO`D. `Na_(2)CO_(3),CO_(2),H_(2)O`

Answer» Correct Answer - D

(D)NA2CO3 , CO2 , H2O

Baking soda, or sodium bicarbonate (NaHCO3), is a chemical that can undergo a decomposition reaction when heated.At temperatures above 176 degrees Fahrenheit (80 degrees Celsius), sodium bicarbonate starts to break down into three compounds, forming sodium carbonate (Na2CO3), water (H2O) and carbon dioxide (CO2)
Discussion
458.

Which of the following types of metal form the most efficient catalysts?A. Alkali metalsB. Alkaline earth metalsC. Transition metalsD. All of these

Answer» Correct Answer - C
Many of the d- block (transition) elements and their compound act as catalyst. Catalytic property is probably due to the utilisation of `(n-1)d` orbitals or formation of intersitital compounds.
Discussion
459.

Water glass is :A. Another name of sodium silicateB. A special from of glass to steor water onlyC. Hydrated from of glassD. Hydrated silica

Answer» Correct Answer - A
Discussion
460.

Colemnite isA. `Ca[B_(3)O_(4)(OH)_(2)].2H_(2)O`B. `Ca_(2)B_(6)O_(11).SH_(2)O`C. `Ca(OH)_(2)`D. `Na_(2)B_(4)O_(7).2H_(2)O`

Answer» Correct Answer - B
Colemnite is a mineral of boron having composition as `Ca_(2)B_(6)O_(11).5H_(2)O`.
Discussion
461.

How do you account for the strong reducing power of lithium in aqueous solution?

Answer» Lithium is the strongest reducing agnet in aqueous soltuion among the alkali metals. This is attrabuted to very small size of `Li^(+)` ion and very large hydration enthalpy which is released. This overcomes both lattice enthalpy and ionisation enthaply that are absorbed.
Discussion
462.

Which of the following is commerically known as oxone ?A. `Na_(2)O_(2)+HCl`B. `Na_(2)O+HCl`C. `Na_(2)O_(2)+Na_(2)O`D. None of these

Answer» Correct Answer - A

(A)Na2O2 + HCl 

Na2O2 + HCl is commercially known as oxone and is used for bleaching of delicate fibres.
Discussion
463.

Alkali metals are good reducing agents becauseA. Gain electronsB. Lose electronsC. Complete their octetD. React with water

Answer» Correct Answer - B
Discussion
464.

The correct order of reducing character of alkali metals isA. `Rb lt K lt Na lt Li`B. `Li lt Na lt K lt Rb`C. `Na lt K lt Rb lt Li `D. `Rb lt Na lt K lt Li`

Answer» Correct Answer - C
Li has the most negative `E^(@)` values of other alkali metals become more and more negative as we , move down the group from Na to Rb. Thus , option (c) is correct .
Discussion
465.

Potassium carbonate when heated to high temperature.A. Gives `CO_(2)`B. Gives `O_(2)`C. Gives `CO`D. Gives no gas at all

Answer» Correct Answer - D
Discussion
466.

`Be(OH)_(2)` is -A. AcidicB. BasicC. AmphotericD. Neutral

Answer» Correct Answer - C
Discussion
467.

Which alkali methal is most meallic in character?A. LiB. NaC. KD. Cs

Answer» Correct Answer - D
Discussion
468.

From Be to Ba electropositive or metallic characterA. IncreasesB. DecreasesC. Remains sameD. Cannot be predicted

Answer» Correct Answer - 1
Discussion
469.

Which has a strong readucing character among the followingA. BeB. MgC. CaD. Ba

Answer» Correct Answer - 4
Discussion
470.

Which of the following statements is/are true?A. All alkali metals are soft and can be cut with knife .B. Alkali metals do not occur in free state in nature .C. Alkali metals are highly electropositive .D. Alkali metal hydrides are covalent and low melting solids.

Answer» Correct Answer - A::B::C
Discussion
471.

Pick out the statement(s) which is (are ) not true about the diagonal relationship of Li and Mg. i) Polarising powers of `Li^(+)` and `Mg^(2+)` are almost same . ii) Like Li , Mg decompose water very fast . iii) LiCl and `MgCl_(2)` are deliquescent . iv) Like Li , Mg does not form solid bicarbonates .A. (i) and (ii)B. (ii) and (iii)C. only (ii)D. only (i)

Answer» Correct Answer - C
Discussion
472.

Which of the following metal mainly used to obtain light energy ?A. LiB. NaC. CsD. Fr

Answer» Correct Answer - B
Discussion
473.

Diagonal relationship is shown by the elementsA. Be and BaB. Li and MgC. Li and NaD. Be and Mg

Answer» Correct Answer - B
Discussion
474.

Be shows diagonal relationship with-A. `Li`B. `Mg`C. `Al`D. `Ba`

Answer» Correct Answer - C
Discussion
475.

Which of the following reaments have a different reaction with Be as compared to other Group 2 metals ?A. dil HClB. `CO_(2)` gasC. dil `HNO_(3)`D. NaOH

Answer» Correct Answer - D
Discussion
476.

The correct order of hydration energy of alkaline earth metal ions isA. `Be^(+2) gt Mg^(+2) gt Ca^(+2) gt Sr^(+2) gt Ba^(+2)`B. `Ba^(+2) gt Be^(+2) gt Ca^(+2) gt Mg^(+2) gt Sr^(+2)`C. `Mg^(+2) gt Be^(+2) gt Ba^(+2) gtCa^(+2) gt Sr^(+2)`D. None

Answer» Correct Answer - A
Discussion
477.

Sodium bicarbonate can react with:A. `Na_(2)CO_(3)`B. NaOHC. NaHD. HCl

Answer» Correct Answer - B::C::D
Discussion
478.

Be and AI resemble inA. Both become passive on reaction with `HNO_(3)` due to formation of oxide layerB. Their chlorides are lewis acidsC. Hydroxides are soluble in alkali as well as in acidD. All

Answer» Correct Answer - D
Discussion
479.

The substance not likely to contain `CaCO_(3)` is:A. DolomiteB. A marble statueC. Sea shellsD. Calcined gyspsum

Answer» Correct Answer - 4
Discussion
480.

`Li` does resemble other alkali metals in following properties:A. `Li_(2)CO_(3)` decomposes into oxides while other alkali carbonates are thermally stableB. `LiCI` is predominatly covalentC. `Li_(3)N` is stableD. All

Answer» Correct Answer - D
Discussion
481.

Which of the following statement is true?A. Lattice enthalpy of oxides, carbonates , fluries decrease from Be to BaB. All form nitrides in airC. The olubilty of the hydroxides increasesa from Be to BaD. All are correct

Answer» Correct Answer - 4
Discussion
482.

When heated in air, the alkali metals form various oxides. Mention the oxides formed by `Li,Na` and K.

Answer» Lithium forms monoxide : `Li_(2)O`
Sodium forms peroxide : `Na_(2)O_(2)`
Potassium forms superoxide :`KO_(2)`
f
Discussion
483.

Which of the following has the highest lattice energy ?A. RbFB. CsFC. NaFD. KF

Answer» Correct Answer - C
For the same anion `(F^(-)) Na^(+)` ion has the smallest size
Discussion
484.

The affinity of sodium with water is used inA. drying of alcoholsB. drying of ammoniaC. drying beneneD. drying most of the compounds

Answer» Correct Answer - C
Sodium can be used to dry benzene since it does not react with benzene.
Discussion
485.

Following information are known abot a metal `M :` `I.` A salt of metal M is used in the manufacture of gunpowder. `II.` The superoxide of metal M is used as an air purifier in submarines. `III.` The hydroxide of metal M is used for the absorption of gases like `CO_(2),SO_(2)`, etc. in eudiometry. Identify the metal M `:`A. SodiumB. CalciumC. MagnesiumD. Potassium

Answer» Correct Answer - 4
`KNO_(3)` is used in the manufacture of gupowder.
`KO_(2)` is used as an air purifier is submarines because it absorbs `CO_(2)` gas and liberates `O_(2)` gas.
`KOH` is used in eudiometry as `CO_(2) & SO_(2)` absorber.
Discussion
486.

`CaCN_(2) + H_(2) O to`

Answer» `CaCN_(2) + 5H_(2)O to CaCO_(3) + 2NH_(4)OH`
Discussion
487.

`Mg_(2)C_(3) + H_(2) O to`

Answer» `Mg_(2)C_(3) + 4H_(2)O to 2Mg(OH)_(2) + CH_(3)C -= CH`
Discussion
488.

`Mg_(2)C_(3)+H_(2)OrarrX`(organic compound). Compound X is :A. `C_(2)H_(2)`B. `CH_(4)`C. propyneD. ethene

Answer» Correct Answer - C
Discussion
489.

Which of the following is obtained on hydrolysis of `Mg_(2)C_(3)` ?A. methaneB. ethaneC. ethyneD. allylene

Answer» Correct Answer - D
On hydrolysis `Mg_(2)C_(3)(` allylide `)` gives `C_(3)H_(4)(` allylene `).`
Discussion
490.

Setting of plaster of paris isA. oxidation with atmospheric oxygenB. combination with atmospheric `CO_(2)`C. dehydrationD. hydration to yield another hydrate

Answer» Correct Answer - d
On hydration of plaster of Paris, it converts into gypsum.
`underset("Plaster of paris")CaSO_(4)(1)/(2)H_(2)O+(3)/(2)H_(2)Orarrunderset("Gypsun")CaSO_(4).2H_(2)O`
Discussion
491.

The ionic conductance is least forA. `Cs^(+)`B. `Rb^(+)`C. `K^(+)`D. `Na^(+)`

Answer» Correct Answer - d
Due to small size of `Na^(+)`, it is heavily hydrated and become large molecule ionic conductance increases down the group in alkali metals. Order of ionic conductance is
`Na^(+)ltK^(+)ltRb^(+)ltCs^(+)`
Discussion
492.

`Be_(2)C + H_(2)C to`

Answer» `Be_(2)C + 2H_(2)O to 2BeO _ CH_(4)`
Discussion
493.

The metallic luster exhibited by sodium is explained byA. Diffusion of sodium ionsB. Oscillations of lose electronsC. Excitation of free protonsD. Existence of body centered cubic lattice

Answer» Correct Answer - B
Electrons jumps between different energy level and release photon.
Discussion
494.

The metallic luster exhibited by sodium is explained byA. diffusion of sodium ionsB. oscillation of loose electronC. excitation of free protonsD. existence of body centred cubic lattice

Answer» Correct Answer - B
Discussion
495.

(X) reacts with sulphur dioxide in aqueous medium to give `NaHSO_(3),` (X) is :A. `Na_(2)CO_(3)`B. `NaNO_(3)`C. `Na_(2)S_(2)O_(3)`D. `NaHSO_(4)`

Answer» Correct Answer - A
Discussion
496.

Drying agent which reacts with `CO_2` and involves water vapour isA. CaOB. `CaCl_(2)`C. `CaCO_(3)`D. `Ca(NO_(3))_(2)`

Answer» Correct Answer - A
Discussion
497.

Select the correct statements about barium:A. It is silverywhite metalB. It forms `Ba(NO_(3))_(2)`which is used in preparation of green fireC. Its ionisation enthalpy is less than radiumD. All the above

Answer» Correct Answer - 4
Discussion
498.

Which of the following oxides have rock salt structure with coordination number `6:6`?A. MgOB. CaOC. SrOD. All the above

Answer» Correct Answer - 4
Discussion
499.

The product obtained as a result of a reaction of nitrogen with `CaC_(2) ` isA. `CaCN_(3)`B. `Ca_(2)CN`C. `CaCN_(2)`D. `CaCN`

Answer» Correct Answer - C
`CaC_(2) + N_(2) to CaCN_(2) + C`
Discussion
500.

Certain characteristics lithium differ from those of other alkali metals, the main reason for this isA. Small size of `Li` atom and `Li^(+)` ionB. Extremely high electropositivity of `Li`C. Greater hardness of `Li`D. Hydration of `Li^(+)` ion

Answer» Correct Answer - A
Small atomic and ionic size leads to high electronegativity and hydration energy. Small atomic and ionic size leads to high electronegativity and hydration energy.
Discussion