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1.

A substance `X` is a compound of an element of group `1 A` the substance `X` gives a violet colour in flame test, `X` isA. NaClB. LiClC. KClD. None of these

Answer» Correct Answer - c
Discussion
2.

Match the compounds given in Column I with their uses mentioned in Column II. `{:(Column I,Column II),(A.CaCO_(3),1."Densitry ornamental work"),(B.Ca(OH)_(2),2."Manufacture of sodium carbonate from caustic soda"),(C.CaO,3."Manufacure of high quality paper"),(D.CaSO_(4),4."Used in white washing"):}`A. `{:("Column I","Column II"),((a) CaCO_(3),(i)"Dentistry, ornamental work"):}`B. `{:("Column I","Column II"),((b) Ca(OH)_(3),(ii)"Manufacture of sodium carbonate from caustic soda"):}`C. `{:("Column I","Column II"),((c ) CaO,(iii)"Manufacture of high quality paper"):}`D. `{:("Column I","Column II"),((d) CaSO_(4),(iv)"Used in white washing"):}`

Answer» Correct Answer - A-III, B-IV, C-II, D-I
Discussion
3.

Alkali metals are charactersied by :A. characterised colouration to flameB. high melting pointsC. low reactivity with waterD. high ionisation enthalpies

Answer» Correct Answer - a
Discussion
4.

Sodium metal can be kept under:A. benzeneB. keroseneC. alcoholD. water

Answer» Correct Answer - b
Discussion
5.

Compounds of alkaline earth metals are less soluble in water than the corresponding alkali metal salts due to :A. their increased covalent characterB. their high ionisation euthalpiesC. high lattice enthalpiesD. none of the above

Answer» Correct Answer - c
Discussion
6.

The alkaline earth metal present in Chlorophy II is :A. BeB. MgC. SeD. Ba

Answer» Correct Answer - b
Discussion
7.

Assertion : Setting of cement is an endothermic process. Reason : Setting of cement involves hydration and rearrangement of the molecules of calcium aluminates and calcium silicates.A. an oxidation processB. a reduction processC. a double decomposition processD. a hydration process.

Answer» Correct Answer - d
Discussion
8.

Sodium reacts with water more vigorously than lithium becauseA. it has higher atomic massB. it is more electropositiveC. it is more electronnegativeD. it is a metal

Answer» Correct Answer - b
Discussion
9.

Which of the following metals does not form ionic hydride?A. BaB. MgC. CaD. Sr

Answer» Correct Answer - b
Discussion
10.

Calcium carbide reacts with water to give ethyne or acetylene gas and calcium hydroxide. Write the balanced chemical equation for this reaction.A. `CH_(4)`B. `C_(2)H_(4)`C. `C_(2)H_(2)`D. `C_(2)H_(6)`

Answer» Correct Answer - c
Discussion