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111. The gas used in welding and cutting metal is (NTSE Chandigarh, Stage-I, 2015-16)
Ethyne
Ethene
Ethane
Propene
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112. A silvery white metal X reacts with water at room temperature to produce a water soluble compound Y and a colourless gas Z. The reaction is highly exothermic and the Z catches fire immediately during the reaction. The solution of Y in water on reacting with stoichiometric amount of dilute solution of hydrochloric acid gives a solution of pH = 7.0. The compounds X, Y and Z respectively are (NTSE Stage-II,2014-15)
AI, AI(OH)3 and H2
Ag, AgOH and H2
K, KCI and H2
Na, NaOH and H2
113. An element X has electronic configuration 2, 8, 1 and another element Y has electronic configuration 2,8,7. They form a compound Z. The property that is not exhibited by Z is (NTSE Stage-II, 2015-16)
It has high melting point
It is a good conductor of electricity in its pure solid state
It breaks into pieces when beaten with hammer
It is soluble in water
114. The compound containing both ionic and covalent bond is (NTSE Stage-II,2015-16)
AIBr3
CaO
MgCI2
NH4CI
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