InterviewSolution
Saved Bookmarks
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.
| 801. |
Complex forming tendency is more for:A. `Na^(+)`B. `K^(+)`C. `Li^(+)`D. `Rb^(+)` |
|
Answer» Correct Answer - C |
|
| 802. |
`underset((" metal chloride"))M overset (Na_(2)HPLO_(4)) underset(NH_(4)Cl"ammonia solution")rarrB`(white paper) `B overset(Delta)rarrC+D+E` (D- pungent smelling gas turns red litmus blue) A is :A. `MgCl^(2)`B. `CaCl_(2)`C. `SrCl_(2)`D. `BeCl_(2)` |
|
Answer» Correct Answer - A |
|
| 803. |
Which of the following alkali metal halides has the lowest lattice energyA. LiFB. NaClC. KBrD. CsI |
|
Answer» Correct Answer - D |
|
| 804. |
`underset((" metal chloride"))M overset (Na_(2)HPLO_(4)) underset(NH_(4)Cl"ammonia solution")rarrB`(white paper) `B overset(Delta)rarrC+D+E` (D- pungent smelling gas turns red litmus blue) C is :A. `Ca_(2)P_(2)O_(7)`B. `Mg_(2)P_(2)O_(7)`C. `Ca(NH_(2)_(2)`D. none of these |
|
Answer» Correct Answer - B |
|
| 805. |
`LiAlH_(4)` is obtained by reaction an eceess of (x) with an ethereal solution of `AlCl_(3^.)`(x) isA. LiClB. LiHC. LiD. LiOH |
|
Answer» Correct Answer - B |
|
| 806. |
Which of the followint hydrogen comounds is most ionicA. LiHB. CsHC. HFD. HI |
|
Answer» Correct Answer - B |
|
| 807. |
Which one of the following halides crystallizes from its aquesous solution as hydrate?A. LiClB. KClC. NaClD. RbCl |
|
Answer» Correct Answer - A |
|
| 808. |
The alkali metal which forms hydrate of chloride salt isA. LiB. NaC. RbD. Cs |
|
Answer» Correct Answer - A |
|
| 809. |
The compound which does not exist as hydrate formA. Ferrous sulphateB. Copper sulphateC. Magnesium sulphateD. Sodium Chloride |
| Answer» Correct Answer - D | |
| 810. |
For which compound does the reaction, `MCO_(3)(s)rarrMO(s)+CO_(2)(g)`occur most readily ?A. `BeCO_(3)`B. `MgCO_(3)`C. `CaCO_(3)`D. `BaCO_(3)` |
| Answer» Correct Answer - A | |
| 811. |
One mole of magnesium nitride on reaction with an excess of water givesA. two moles of `HNO_(3)`B. two moles of `Nh_(3)`C. 1 mole of `NH_(3)`D. 1 mole of `HNO_(3)` |
|
Answer» Correct Answer - B `Mg_(3)N_(2)+H_(2)OrarrNH_(3)+Mg(OH)_(2)` |
|
| 812. |
`Be` and `Al` exhibit many properties which are similar. But the two elements differ inA. exhibiting maximum covalency in compoundsB. forming polymeric hydridesC. forming covlalent bondsD. exhibiting amphoteric nature in their oxides |
| Answer» Correct Answer - A | |
| 813. |
Which of the following groups of elements have properties that are most similar?A. Na,K,CsB. Mg,Sr,BaC. Be ,Al,CaD. all the above |
|
Answer» Correct Answer - 4 |
|
| 814. |
yellow phosphorus on reaction with `Ca(OH)_(2)` gives:A. `CA(H_(2)PO_(4))_(2)`B. `Ca(H_(2)PO_(2))_(2)`C. `PH_(3)`D. Both 2&3 |
|
Answer» Correct Answer - 4 |
|
| 815. |
Which of the following disproportionate (s) in heating with sodium hydroxidede?A. `P_(4)`B. `S_(8)`C. `Cl_(2)`D. B |
|
Answer» Correct Answer - A::B::C |
|
| 816. |
Ionic nature of group II A hydrides isA. `BeH_(2) gt MgH_(2) gt CaH_(2) gt SrH_(2) gt BaH_(2)`B. `BeH_(2) lt MgH_(2) lt CaH_(2) lt SrH_(2) lt BaH_(2)`C. `BeH_(2) gt MgH_(2) lt CaH_(2) lt SrH_(2) lt BaH_(2)`D. None |
|
Answer» Correct Answer - 2 |
|
| 817. |
Correct statement(s) among the following is/are :A. From saturated aq solution, `BaCO_(3)` and `BaSO_(4)` precipates without any water of crystallisaton.B. The hydrated chlorides, bromides and iodides of Ca, Sr, Ba can be dehydrated on heating but those of Be and Mg hydrolysis if heated.C. Among the fluorides of IIAl, `BeF_(2)` is readily soluble in water.D. `BeCO_(3)` can be precipitated completely by addition of sodium carbonate to `Be^(2+)` aq solution. |
|
Answer» Correct Answer - ABC |
|
| 818. |
Select the incorrect statement with respect to sodium peroxide ?A. It decolurises the acidified `KMnO_(4)` solution.B. On heating with oxygen at `450^(@)`C and 300 atm pressure, it becomes paramagneticC. It Is obtained along with sodium metal, when sofium oxide is heated to a temperature more than `400^(@)`C.D. It gives both hydrogen peroxide and oxygen gas with water as well with sulphuric acid. |
|
Answer» Correct Answer - D |
|
| 819. |
Wwhich of the following statements are true about the alkali metals?A. All alkali-metal salts impart a characteristics colour to the Bunsen flame.B. Among LiOH,CsOH,KOH and RbOH, CsOH has the highest solubility in waterC. Among the alkali meatals, cesium is the most reactive.D. Reducing character of the alkali metal hydrides follow the order : `LiHgtNaHgtKHgtRbHgtCsH`. |
|
Answer» Correct Answer - A::B::C |
|
| 820. |
Thehalide that is highly soluble in `H_(2)O` among the following isA. `BeF_(2)`B. `CaF_(2)`C. `MgF_(2)`D. `BaF_(2)` |
|
Answer» Correct Answer - 1 |
|
| 821. |
Chloride of Ca and Ba crystallises from their saturated aqueous solution as `CaCl_(2).YH_(2)O` and `BaCl_(2).ZH_(2)O`. Then `(Y)/(Z)`= |
|
Answer» Correct Answer - 3 |
|
| 822. |
Select the correct statements:A. Gypsum is obtained by heating plaster of paris.B. `Li^(+)` and `Mg^(2+)` chlorides are hydrated salts.C. `Na_(2)CO_(3)` is water soluble but `CaCO_(3)` is insoluble.D. Solubility of `BeF_(2)` in water is high compared with solubillity of other IIA group metal fluorides |
|
Answer» Correct Answer - BCD |
|
| 823. |
`MgCl_(2^.)XH_(2)O,CaCl_(2^.)YH_(2)O` and `BaCl_(2^.)ZH_(2)O` The value of X,Y and Z are respectively.A. 2,6,8B. 8,6,2C. 2,4,8D. 4,6,8 |
|
Answer» Correct Answer - 2 |
|
| 824. |
Select correct statementA. Beryllium and magnesium hydrides are covalent and polymeric.B. `CaH_(2),SrH_(2) " and " BaH_(2)` are ionic.C. Berillium hydride contains 3c2e bonds.D. Ionic hydrides react with water forming hydrogen |
|
Answer» Correct Answer - ABCD |
|
| 825. |
Which of the following is more soluble in enther?A. `BeCl_(2)`B. `CaCl_(2)`C. `SrCl_(2)`D. `BaCl_(2)` |
|
Answer» Correct Answer - 1 |
|
| 826. |
When 1 mole of a substance `(X)` was treated with an excess of water, 2 moles of readily combustible gas were produced along with solution which when reacted with `CO_(2)` gas produced a white turbidity. The substance `(X)` could beA. `Ca`B. `CaH_(2)`C. `Ca(OH)_(2)`D. `Ca(NO_(3))_(2)` |
|
Answer» Correct Answer - B `underset((X))(CaH_(2))+2H_(2)O rarr underset("White turbidity")(Ca(OH)_(2)+2H_(2))overset(+O_(2))rarr CaCO_(2)+H_(2)O` |
|
| 827. |
`Be(OH)_(2)` is insoluble in water while `Ba(OH)_(2)` is highly soluble due toA. Bond orderB. Lattice energy differenceC. Common ion effectD. Hard acid |
|
Answer» Correct Answer - B On moving down the group , lattice energy decreases with increase in size of cation. |
|
| 828. |
Which of the following statement is incorrectA. The effective component of bleaching powder is `OCl^(-)`B. `BaCO_(3)` is obtained when quick lime is heated with coke in an electric furnance.C. Anhydrous `CaSO_(4)` is dead burnt plasterD. `BaCO_(3)` is obtained of fusion of `BaSO_(4)` and `Na_(2)CO_(3)` |
|
Answer» Correct Answer - B |
|
| 829. |
When silicon or boron is dissolved in caustic soda , hydrogen gas is liberated . It isA. A disproporotionation reactionB. A redox reactionC. A double decomposition reactionD. An acid-base neutralization reaction |
|
Answer» Correct Answer - B |
|
| 830. |
Consider the following statement: `S_(1)`:`Cu^(2+)` ions are reduced to `Cu^(+)` by potassium iodide and potassium cyanide both, when taken in excess `S_(2)`:`H_(2)S` will precipitate the sulphide of all the metals from the solutions of chlorides of `Cu,Zn` and `Cd` if the solution is aqueous. `S_(3)`:The presence of magnesium is confirmed in qualitative analysis by the formation of a white crystal `S_(4)` :Calomel on reaction with potassium iodide gives red precipitate. and arrange in the order of true/false.A. TTTTB. TTTFC. FTTFD. FTFF |
|
Answer» Correct Answer - B |
|
| 831. |
`X+C+Cl_(2)overset(High" "temperature)underset(of" "about" "1000" "K)rarrY+CO,Y+2H_(2)OrarrZ+2HCl` Compound Y is found in polymeric chain structure and is an electron deficent molecule. Y must be :A. `BeO`B. `BeCl_(2)`C. `BeH_(2)`D. `AlCl_(3)` |
| Answer» Correct Answer - B | |
| 832. |
When magnesium ribbon is heated to redness in an atmosphere of nitrogen and subsequently cooled with water, the gas evolved is-A. `N_(2)`B. `NH_(3)`C. `O_(2)`D. `CO_(2)` |
|
Answer» Correct Answer - B `3Mg + 6N_(2) overset(Delta)rarr 2Mg_(3)N_(2)` `Mg_(3)N_(2)+ 6HOH rarr 3Mg(OH)_(2)+ 2NH_(3)` |
|
| 833. |
When magnesium ribbon is heated to redness in an atmosphere of nitrogen and subsequently cooled with water, the gas evolved is-A. `NH_(3)`B. `H_(2)`C. `O_(2)`D. `N_(2)` |
|
Answer» Correct Answer - 1 |
|
| 834. |
0.2g of magnesium ribbon was placed in a crucible and heated with lid on until magnesium began to burn rapidly. At the end of experiment, 0.3g of a white powder was formed. Show that the result does not agree with the combustion equation. What might have gone wrong? |
|
Answer» The combustion equation is : `underset(2 xx 24 = 48g)(2Mg) + O_(2) overset("Heat")(to) underset(2 xx (24 + 1) = 80g)(2MgO)` 48g of magnesium ribbon on combustion form `MgO = 80 g` 0.3g magnesium ribbon on combustion form `MgO = ((80g))/((48g)) xx (0.3 g) = 0.33g` But `MgO` actually formed = 0.3g This means that MgO actually formed is less. There might have been many reasons for this. For example, (i) Some MgO might have escaped from the crucible as vapours. (ii) some Mg might have reacted with nitrogen present in air to form magnesium nitride `(Mg_(3)N_(2))`. Some Mg might not have reacted under the reaction conditions. |
|
| 835. |
Barium burns in air to fromA. BaOB. `BaO_(2)`C. `Ba_(2) O_(2)`D. `Ba(OH)_(2)` |
|
Answer» Correct Answer - A BaO. Alkaline earth metals comine directly with `O_(2)` to form oxides which when further heated in presence of excess of `O_(2)` from peroxides. |
|
| 836. |
Property of the alkaline earth metals that increases with their atomic number isA. Ionisation enthalpyB. Solubility of their hydroxidesC. Solubility of their sulphatesD. Electronegativity |
|
Answer» Correct Answer - B Solubility of the hydroxides of the alkaline earth metals increase down the group since their lattice energies decrease more rapidly than their hydration energies. |
|
| 837. |
Which out of the following statements is not correct for anyhydrous calcium chloride ?A. It is prepared by heating hydrated calcium chloride above `533 K`B. It is used for drying alcohols and `NH_(3)`C. It is used as a dehydrating agent to control snow and ice on highway and pavementsD. When mixed in concrete, it gives quicker initial setting and improves its strength. |
|
Answer» Correct Answer - B Anhydrous `CaCl_(2)` is not used as dry alcohol as it forms `CaCl_(2).4C_(2)H_(5)OH` and also reacts with `NH_(3)`. |
|
| 838. |
When washing soda is heated.A. `CO_(2)` is releasedB. `CO+CO_(2)` is releasedC. CO is releasedD. water vapour is released |
|
Answer» Correct Answer - D `Na_(2)CO_(3)* 10H_(2)O overset(Delta)to Na_(2)CO_(3)*H_(2)O overset(Delta)to Na_(2)CO_(3)+H_(2)O uarr` |
|
| 839. |
When washing soda is heatedA. CO is releasedB. `CO + CO_(2)` is releasedC. `CO_(2)` is releasedD. Water vapour is released |
|
Answer» Correct Answer - D Washing soda is `Na_(2) CO_(3). 10H_(2)O` `Na_(2)CO_(3). 10H_(2)O overset(Delta)to Na_(2) CO_(3). H_(2)O + 9H_(2)O` `Na_(2)CO_(3). H_(2)O overset(Delta)to Na_(2) CO_(3) +H_(2)O uarr` |
|
| 840. |
Choose the correct statement for `BeCl_(2)` :A. In solid phase, it has a chain structureB. In vapour phase, it tends to form a chloro bridged dimerC. At temperatures of the order 1200 K, it forms monomerD. It hydrolyses to give `Be(OH)_(4)^(2-)" and "HCl` |
|
Answer» Correct Answer - A::B::C `BeCl_(2)+H_(2)Orarr[Be(OH)_(2)]_(n)`(s)+HCl` |
|
| 841. |
Which among the following are expected to form hydrates?A. `MgCl_(2)`B. `CaCl_(2)`C. `LiCl`D. `KCl` |
| Answer» Correct Answer - A::B::C | |
| 842. |
The elements of group 1 are called alkali metals becauseA. Their oxides form acidic solutions on treating with waterB. Their peroxides form alkalies solution on treating with waterC. Their oxides and hydroxides form alkalies solutions on treating with waterD. Their hydroxides form acidic solution on treating with water |
|
Answer» Correct Answer - C Their oxides and hydroxides form alkaline solutions on treating with water. |
|
| 843. |
Which of the following alkali metals has the biggest tendency of the half reaction `M(g) rarr M^(+)(aq)+e`A. SodiumB. LithiumC. PotassiumD. Cesium |
|
Answer» Correct Answer - B `M_(g)rarr M_((aq)+e^(-))^(+)` `Li` has biggest tendency of the half - reaction and most powerful reducing agent. |
|
| 844. |
Which sulphate has the highest solubility in water ?A. `BaSO_(4)`B. `CaSO_(4)`C. `BeSO_(4)`D. `MgSO_(4)` |
|
Answer» Correct Answer - C `BeSO_(4)` has the highest solubility due to maximum hydration energy |
|
| 845. |
When sodium is heated with moist air, then the product obtained isA. `Na_(2)O`B. `NaOH`C. `Na_(2)CO_(3)`D. `Na_(2)O_(2)` |
|
Answer» Correct Answer - A `2Na+(1)/(2)O_(2)overset("moist air")rarrNa_(2)O` `Na_(2)O+2H_(2)Orarr 2NaOH+H_(2).` |
|
| 846. |
Choose the correct statement(s) :A. Crystals of sodium hydroxide are deliquescentB. Sodium amalgam is a heterogeneous alloyC. `NaHCO_(3)` is used as a mild antisepticD. `NaHCO_(3)` is made by heating `Na_(2)CO_(3)` in moist `CO_(2)` atmosphere |
|
Answer» Correct Answer - A::B::C `NaHCO_(3)` is made by saturating a solution of `Na_(2)CO_(3)` with `CO_(2)` `Na_(2)CO_(3)+H_(2)OCO_(2)rarr2NaHCO_(3)` |
|
| 847. |
Metals form basic hydroxides. Which of the following metal hydroxide is the least basic?A. `Mg(OH)_(2)`B. `Ca(OH)_(2)`C. `Sr(OH)_(2)`D. `Ba(OH)_(2)` |
|
Answer» Correct Answer - A `Mg(OH)_(2)` is least basic in nature |
|
| 848. |
When Na reacts with liquid `NH_(3)` the substance formed initially isA. `[Na(NH_(3))_(x)]^(-)`B. `[e(NH_(3))_(y)]^(-)`C. `NaNh_(2)`D. `Na_(x)(NH_(3))_(y)` |
|
Answer» Correct Answer - B |
|
| 849. |
Assertion . In rainy season , common salt becomes damp after some time on keeping in air . Reason . Common salts in NaCl which is hygroscopic in nature .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 falseD. If both assertion and reason are false. |
|
Answer» Correct Answer - c Correct reason . Common salt contains impurities of `MgCl_(2) , CaCl_(2) , MgSO_(4) , CaSO_(4) ,`etc. which are hygroscopic . |
|
| 850. |
Oxygen evoolves on heatingA. `BaO_(2)`B. `CaO_(2)`C. `SrO_(2)`D. All |
|
Answer» Correct Answer - 4 |
|