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Arihant General Studies English

Q41.Which one of the following acids is secreted by leaves of Nettle that causes painful stings ? CDS 2021 (II)

AMethanoic acid BCitric acid CTartaric acid DAcetic acid

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Arihant General Studies English

Q42.Which one of the following is the correct reactivity order of metals reacting with dilute HCl? CDS 2021 (II)

AMg >AI > Zn > Fe BMg< AI < Zn < Fe CMg > Zn > Fe > AI DFe> Mg> AI> Zn

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Arihant General Studies English

Q43.Which one of the following sodium compounds is used for softening hard water? CDS 2021 (I)

ANa2CO3 BNaHCO3 CNaOH DNa2SO4

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Arihant General Studies English

Q44.Which one of the following is used in soda-acid fire extinguishers

ASodium chloride CDS 2021 (I) BSodium hydrogen carbonate CCalcium hydroxide DAcetic acid

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Arihant General Studies English

Q45.105. Which one of the following is an electric conductor? CDS 2021 (I)

AA plastic sheet BDistilled water CHuman body DA wooden thin sheet

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Arihant General Studies English

Q46.Which one of the following metals has both malleability and ductility properties? CDS 2021 (I)

ANa BAu CCe DHg

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Arihant General Studies English

Q47.Which one of the following is the chemical formula of Plaster of Paris? NDA 2021 (II)

ACaSO 1 2 H O 4 2 ⋅ BCaSO 2H O 4 2 ⋅ CCaSO 5H O 4 2 ⋅ DCaSO 4H O 4 2 ⋅

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Arihant General Studies English

Q48.What is the total number of covalent bonds in methanol? NDA 2021 (II)

A3 B4 C5 D6

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Arihant General Studies English

Q49.Which one of the following ions is not iso-electronic with F−? NDA 2021 (II)

AO2− BNa + CNe DN−

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Arihant General Studies English

Q50.Which one of the following methods can be used to separate anthracene from a mixture of salt and anthracene? NDA 2021 (II)

ADistillation BSublimation CEvaporation DChromatography

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Arihant General Studies English

Q51.Which one of the following pairs of elements is liquid at room temperature and at normal pressure? NDA 2021 (II)

AGallium and Bromine BMercury and Bromine CGallium and Mercury DGallium and Caesium

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Arihant General Studies English

Q52.Cinnabar is an ore of which one of the following? NDA 2021 (II)

ACopper BZinc CMercury DManganese

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Arihant General Studies English

Q53.The process whereby certain minerals absorb water, expand and change is called as NDA 2021 (I)

AHydration BOxidation CHydrolysis DCarbonation

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Arihant General Studies English

Q54.Common salt (NaCI) is not used as a raw material for perparation of which one of the following compounds ? NDA 2021 (I)

ABleaching powder BBaking soda CPlaster of Paris DWashing soda

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Arihant General Studies English

Q55.Reaction of quick lime (CaO) with water to produce slaked lime (Ca(OH) ) 2 is an example of NDA 2021 (I)

Adisplacement reaction Bendothermic reaction Cdecomposition reaction Dexothermic reaction

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Arihant General Studies English

Q56.Which one of the following is the lowest possible temperature? NDA 2021 (I)

A0° celsius B− ° 73 celsius C− ° 173 celsius D− ° 273 celsius

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Arihant General Studies English

Q57.Which of the following sets of elements has the same valency? NDA 2021 (I)

ANa, Mg, Ca BNa, Mg, Al CMg, Ca, K DMg, Ca, Ba

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Arihant General Studies English

Q58.Solder is an alloy of NDA 2021 (I)

ACu and Sn BFe and Zn CPb and Sn DAg and Zn

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Arihant General Studies English

Q59.In electrolytic refining of copper, the electrolyte is a solution of NDA 2021 (I)

Aacidified copper chloride Bacidified copper sulphate Cpotassium chloride Dsodium sulphate

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Arihant General Studies English

Q60.Which one of the following is not used as a raw material in the manufacture of glass? NDA 2021 (I)

ASoda BAlumina CBorax DGypsum

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