By adding gypsum to cement:

(1) Setting time of cement becomes less       

(2) Setting time of cement increases

(3) Colour of cement becomes light               

(4) Shining surface is obtained

Subtopic:  Reasoning Questions | Compounds of Ca and Na -Preparations, Properties & Uses |
 70%
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Property of all the alkaline earth metals that increases with their atomic number is :

(A) Solubility of their carbonates

(B) Thermal stability of their sulphates

(C) Ionisation energy

(D) Electronegativity

Subtopic:  Physical Properties |
 70%
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A metal [x] on heating on nitrogen gas gives [Y]. [Y] on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a blue colour. [Y] is

(A) MgNO32                                     

(B) Mg3N2

(C) NaN3                                             

(D) MgO

Subtopic:  Compounds of Ca and Na -Preparations, Properties & Uses |
 66%
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The density of-

1. Na > K                                                     

2. Na = K

3. K > Na                                                     

4. Li > K

Subtopic:  Physical Properties |
 72%
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Lattice energy is lowest for –

(A) LiF                                                       

(B) NaCl

(C) KBr                                                       

(D) CsI

Subtopic:  Physical Properties |
 78%
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Which of the following halides has the highest melting point-

(A) NaCl                                           

(B) KCl

(C) NaBr                                           

(D) NaF

Subtopic:  Physical Properties | Preparations, Properties & Uses of S Block Elements |
 67%
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Alkaline earth metals form hydrated crystalline solids such as MgCl2.6H2O, CaCl2.6H2O. This is due to-

(1) Smaller ionic size

(2) Increased charge on ions

(3) Higher hydration enthalpies

(4) High oxidation potential

Subtopic:  Chemical Properties |
 83%
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A chloride dissolves appreciably in cold water. When placed in a platinum wire in Bunsen flame no distinctive colour is noticed. Which cation could be present –

(1) Be2+                                         

(2) Ba2+

(3) Pb2+                                         

(4) Ca2+

Subtopic:  Physical Properties |
 77%
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Which of the following is a false statement-

(1) Sodium oxide is more basic then magnesium oxide.

(2) Beryllium oxide is amphoteric

(3) The thermal stability of beryllium carbonate is more than that of calcium carbonate

(4) Beryllium is amphoteric

Subtopic:  Physical Properties |
 72%
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Which alkali metal has the lowest melting point and exists as a liquid –

(1) Na                                                             

(2) K 

(3) Rb                                                             

(4) Cs

Subtopic:  Physical Properties |
 74%
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