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1➤ Which of the following is a non metal that remains liquid at room temperature?

PhosphorousBromineChlorineHelium

2➤ Chemical formula for water is

NaAlO2H2OAl2O3CaSiO3

3➤ The gas usually filled in the electric bulb is

nitrogenhydrogencarbon dioxideoxygen

4➤ Washing soda is the common name for

Sodium carbonateCalcium bicarbonateSodium bicarbonateCalcium carbonate

5➤ Quartz crystals normally used in quartz clocks etc. is chemically

sodium silicategermanium oxidesodium silicatesilicon dioxide

6➤ Which of the gas is not known as green house gas?

MethaneNitrous oxideCarbon dioxideHydrogen

7➤ Bromine is a

black solidred liquidcolourless gashighly inflammable gas

8➤ The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

ArgonXenonHeliumKrypton

9➤ The property of a substance to absorb moisture from the air on exposure is called

osmosisdeliquescenceefflorescencedesiccation

10➤ The average salinity of sea water is

3%3.5%2.5%2%

11➤ Galvanised iron sheets have a coating of

leadchromiumzinctin

12➤ The group of metals Fe, Co, Ni may best called as

transition metalsmain group metalsalkali metalsrare metals

13➤ Heavy water is

deuterium oxidePH7rain watertritium oxide

14➤ The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of

brominefluorinechlorinesulphur

15➤ The element common to all acids is

hydrogencarbonsulphuroxygen

16➤ Non stick cooking utensils are coated with

TeflonPVCblack paintpolystyrene

17➤ Monazite is an ore of

titaniumzirconiumironthorium

18➤ Carbon, diamond and graphite are together called

allotropesisomersisotopesisomorphs

19➤ Potassium nitrate is used in

medicinefertilisersaltglass

20➤ Permanent hardness of water may be removed by the addition of

sodium carbonatealumsodium alum

21➤ Which of the following was to be discovered first in the chromospheres of the sun?

KryptonXenonNeonHelium

22➤ Sodium metal is kept under

petrolalcoholwaterkerosene

23➤ Which of the following is in liquid form at room temperature?

LithiumSodiumFranciumCerium

24➤ Which of the following are the ingredients of gun metal?

Iron, Zinc, TitaniumIron, tinIron, Brass, TinCopper, Tin

25➤ From which mineral is radium obtained?

RutileHaematiteLimestonePitchblende

26➤ What is laughing gas?

Nitrous OxideCarbon monoxideSulphur dioxideHydrogen peroxide

27➤ Actinides are the elements with atomic numbers from

97 to 104101 to 11589 to 10336 from 43

28➤ The filament of an electric bulb is made of

tungstennichromegraphiteiron

29➤ Diamond is an allotropic form of

germaniumcarbonsiliconsulphur

30➤ In fireworks, the green flame is produced because of

sodiumbariummercurypotassium

31➤ Permanent hardness of water can be removed by adding

chlorinewashing sodapotassium permanganatebleaching powder

32➤ Marsh gas is

nitrogenethanemethanehydrogen

33➤ Air is a/an

compoundelementelectrolytemixture

34➤ Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?

TelevisionRefrigeratorTube lightCooking gas

35➤ Balloons are filled with

nitrogenheliumoxygenargon

36➤ Which of the following does not contain a coinage metal?

Silver and GoldZinc and GoldCopper and SilverCopper and Gold

37➤ Which metal pollute the air of a big city?

CopperChromiumLeadCadmium

38➤ Which of the following is not an isotope of hydrogen?

TritiumDeuteriumProtiumYttrium

39➤ Which of the following is the lightest metal?

MercuryLithiumLeadSilver

40➤ Which of the following metals remain in liquid for under normal conditions?

RadiumZincUraniumMercury

41➤ Which of the following is an element?

RubySapphireEmeraldDiamond

42➤ Brass gets discoloured in air because of the presence of which of the following gases in air?

OxygenHydrogen sulphideCarbon dioxideNitrogen

43➤ Which of the following is a non metal that remains liquid at room temperature?