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Point out the property which is not characteristic of alkali metal:
NUMS 2014
Chemistry
s and p Block Elements
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The lower part of the “Solvay tower” has been cooled during the manufacture of soda ash because:
NTS 2014
Chemistry
s and p Block Elements
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Hydrides which are prepared by passing hydrogen gas over hot alkali metals or alkaline earth metals are called:
NTS 2011
Chemistry
s and p Block Elements
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Which of the following elements has the highest boiling point?
NTS 2014
Chemistry
s and p Block Elements
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When Gypsum is heated to about 100° C, it losses some water of crystallization and becomes:
NTS 2011
Chemistry
States of Matter – Gases, Liquids and Solids
s and p Block Elements
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Strontium lies between calcium and barium in Group II A in the Periodic Table. Which of the properties could be predicted for strontium?
NTS 2015 DUHS and JSMU
Chemistry
s and p Block Elements
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To avoid the formation of toxic compounds with chlorine, which substance is used for disinfecting water?
NUMS 2016
Chemistry
s and p Block Elements
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Which of the following is not true about caustic soda? a) It causes painful burns c) It is manufactured by Costner—Kellner process e) Both b and d
Which of the following compounds is formed when sodium burns in excess of air?
NTS 2014
Chemistry
s and p Block Elements
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Oxygen does not react with:
NTS 2015 DUHS and JSMU
Chemistry
s and p Block Elements
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Which one of the following alkaline earth metal carbonates is thermally the most stable?
NUMS 2020
Chemistry
s and p Block Elements
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Which of the following statements about H2S is false:
NTS 2010
Chemistry
s and p Block Elements
Elimination Tool:
Magnesium reacts with nitrogen to form:
PMC 2020
Chemistry
s and p Block Elements
Elimination Tool:
Which ions shall be removed to make hard water soft?
NUMS 2019 Cancelled
Chemistry
s and p Block Elements
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Which one of the following statements is true?
NUMS 2016
Chemistry
s and p Block Elements
Elimination Tool:
________ are prepared by passing hydrogen gas over hot alkali metals or alkaline earth metals?
NTS 2015 SMBBMC
Chemistry
s and p Block Elements
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Metals belonging to the same group in the periodic table are
NUMS 2014
Chemistry
s and p Block Elements
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Potassium, Rubidium, Cesium react with oxygen to form which types of oxides?
PMC 2020
Chemistry
s and p Block Elements
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Caster kellners cell evaporated has replaced __________ because the Caster Kellner process evaporates__________?
NTS 2015 SMBBMC
Chemistry
s and p Block Elements
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Which of the following is least polarizable?
NUMS 2014
Chemistry
s and p Block Elements
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The false statement regarding saline hydrides is:
NTS 2014
Chemistry
s and p Block Elements
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Which of the following statements is true?
NUMS 2014
Chemistry
s and p Block Elements
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The flame colour of Ca in flame test is:
NUMS 2020
Chemistry
s and p Block Elements
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Which is most basic in character?
NTS 2015 DUHS and JSMU
Chemistry
s and p Block Elements
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Chlorine upon reaction in cold NaOH yields:
NUMS 2014
Chemistry
s and p Block Elements
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The nitrides of alkaline earth metals hydrolyse with water to form:
NUMS 2020
Chemistry
s and p Block Elements
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What is the chemical formula for plaster of Paris?
NTS 2010
Chemistry
s and p Block Elements
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Which property of the Group II elements (magnesium to barium) and their compounds increases with an increasing proton (atomic) number?
NUMS 2016
Chemistry
s and p Block Elements
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Densities of alkali metals are low due to:
PMC 2020
Chemistry
s and p Block Elements
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The chemical name of the baking powder is:
NTS 2011
Chemistry
s and p Block Elements
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Most abundant salt of sodium in nature is:
NTS 2017
Chemistry
s and p Block Elements
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Which of the following is the correct order of electronegativity (from highest to lowest)?
NTS 2015 SMBBMC
Biology
s and p Block Elements
Chemical Bonding
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Which of the following is chrome yellow’s pigment?
NTS 2015 SMBBMC
Chemistry
s and p Block Elements
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Which of the following oxides is most acidic oxide?
NUMS 2019 Reconduct
Chemistry
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Nascent hydrogen used in the formation of methane is obtained from the reaction of:
NTS 2010
Chemistry
s and p Block Elements
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By heating 25g of limestone (CaCO3) , the weight of carbon dioxide produced is
NTS 2011
Chemistry
s and p Block Elements
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Magnesium oxide is used in:
NTS 2015 DUHS and JSMU
Chemistry
s and p Block Elements
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Sodium reacts with water more vigorously than lithium because it:
NTS 2010
Chemistry
s and p Block Elements
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The ionization of Hydrogen atom gives:
NTS 2015 DUHS and JSMU
Chemistry
s and p Block Elements
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Commercial hydrogen is obtained from:
NTS 2015 DUHS and JSMU
Chemistry
s and p Block Elements
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Which is the paramagnetic oxide of chlorine?
NUMS 2019 Reconduct
Chemistry
s and p Block Elements
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Pierrie Curie and Marie Curie isolated which radioactive element?
NTS 2015 SMBBMC
Biology
s and p Block Elements
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The carbonates of alkali metals are soluble in water except:
NUMS 2020
Chemistry
s and p Block Elements
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