Chemistry S-Block Elements Online Mcqs Test

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Question 1

1. Setting of Plaster of Paris involves

Answer

Combination with atmospheric CO₂

Answer

Hydration to yield another hydrate

Answer

Dehydration

Answer

Oxidation with atmospheric oxygen

Question 2

2. The alkali metal that reacts with nitrogen directly to form nitride is

Question 3

3. Borax is a white crystalline solid and it is

Answer

Insoluble in water

Answer

Soluble only in organic solvents

Answer

More soluble in hot water

Answer

More soluble in cold water

Question 4

4. Which of the following statements is correct with respect to the property of elements with increase in atomic number in the carbon family (group 14)?

Answer

Their metallic character decreases

Answer

Their atomic size decreases

Answer

Their ionization energy increases

Answer

The stability of +2 oxidation state increases

Question 5

5. Amongst the metals Be, Mg, Ca and Sr of group 2 of the periodic table, the least ionic chloride would be formed by

Question 6

6. Aluminorthermy used for on the spot welding of large iron structure is based upon the fact that

Answer

As compared to aluminum, iron has greater affinity for oxygen

Answer

Reaction between iron and oxygen is endothermic

Answer

As compared to iron, aluminum has greater affinity for oxygen

Answer

Refraction between aluminum and oxygen is endothermic

Question 7

7. Anodizing of Al is said when

Answer

Aluminum obtained at anode

Answer

Aluminum allay containing 95% Al

Answer

Aluminum coated electrically with aluminum oxide

Answer

Aluminum prepared electrolytically

Question 8

8. Which of the following sulphates is not soluble in water?

Answer

Sodium sulphate

Answer

Barium sulphate

Answer

Zinc sulphate

Answer

Potassium sulphate

Question 9

9. Microcosmic salt is

Answer

K(NH₄)HPO₃. 2H₂O

Answer

HPO₄.4H₂O

Answer

Na(NH₄). H₂O

Answer

Na(NH₄)HPO₄.4H₂O

Question 10

10. Boric acid (H₃BO₃) reacts with NaOH to give a salt.

Answer

Na₃BO₃

Answer

Na₂HBO₃

Answer

Na₂B₄O₇

Question 11

11. Sodium conducts electricity because

Answer

It is a soft alkali metal

Answer

It has mobile electrons

Answer

It has only one electron in the outermost orbit

Answer

It gives hydrogen with water

Question 12

12. Which one of the following gives white precipitate with aqueous BaCl₂?

Answer

Na₂co₃

Question 13

13. Which one is not an element of III A group?

Question 14

14. The element having least value of heat of hydration is

Question 15

15. Which of the following is most abundant in the earth’s crust?

Question 16

16. The formula of calcium cyanamide is

Question 17

17. Which of the most basic of the following?

Question 18

18. Choose the number of group of periodic table to which alkali metals belong to

Question 19

19. The substance used as a smoke screen in warfare is

Question 20

20. Among the following oxides, the one which is most basic is

Answer

Nitrogen pent oxide

Answer

Zinc oxide

Answer

Aluminum oxide

Answer

Magnesium oxide

Question 21

21. Which halide has highest melting point?

Question 22

22. Which of the following is most dense?

Question 23

23. The wire in the flash bulbs is made up of

Question 24

24. First ionization potential of alkaline earth metal is greater than alkali metals because

Answer

They have smaller size

Answer

They have greater atomic size

Answer

They are more reactive

Question 25

25. The solubility of aluminum hydroxide in sodium hydroxide solution is due to formation of

Answer

Sodium aluminum hydroxide

Answer

Sodium meta aluminate

Answer

Sodium aluminum hydride

Answer

Aluminum peroxide

Question 26

26. Which of the following is not a use of silicon?

Answer

Hydraulic brakes

Answer

Water repellent

Answer

Antifreeze

Answer

Lubricants

Question 27

27. Point out one of the following which shows moderate electrical conductivity:

Answer

Carbrandum

Question 28

28. Which electronic configuration corresponds to an element of group IIIA?

Answer

1s2 2s2 2p4

Answer

1s2 2s2 2p3

Answer

1s2 2s2 2p6 3s2 3p1

Answer

1s2 2s2 2p6 3s2 3p6 4s2 3d1

Question 29

29. Washing soda has formula

Answer

Na₂CO₃.

Answer

Na₂CO₃. 3H₂O

Answer

Na₂CO₃. 10H₂O

Answer

Na₂CO₃. 7H₂O

Question 30

30. Which compound will show the highest lattice energy?

Question 31

31. One of the following does not form oxide on heating

Answer

Na₂ CO₃

Question 32

32. BF₃ acts as acid according to the concept of

Question 33

33. Galena is an ore of

Question 34

34. Which metal is protected by a layer of its own oxide?

Question 35

35. Silicon is found in nature in the form of

Answer

Silica or siticates

Answer

Only silicates

Question 36

36. White lead is

Answer

Basic lead carbonate

Answer

Acidic lead carbonate

Answer

Basic lead acetate

Answer

Basic lead hydroxide

Question 37

37. Potassium is kept in

Question 38

38. The elements which belong to group IIIA are called

Answer

S – block

Answer

D – block

Answer

F – block

Answer

P – block

Question 39

39. The order of alkali metals is

Answer

Li, Na, Cs, K, Rb, Fr

Answer

Fr, Li, Rb, K, Na, Cs

Answer

Li, Na, K, Rb, Cs, Fr

Answer

Na, K, Li, Rb, Fe, Cs

Question 40

40. Which is the formula of Chili Salt Peter?

Answer

Na₂So₄

Question 41

41. Boric acid cannot be used

Answer

For enamels and glazes

Answer

In soda bottles

Answer

An antiseptic medicine

Answer

For washing of eyes

Question 42

42. Which element is present in excess in skeletal material?

Question 43

43. The aqueous solution of potash alum is

Answer

None of these

Question 44

44. With the increase in atomic weights, melting points of the alkali metals

Answer

Do not show definite trend

Answer

Remain constant

Question 45

45. Plaster of Paris hardens by

Answer

Changing into CaCO₃

Answer

Giving off CO₂

Answer

Giving out water

Answer

Combining with water

Question 46

46. Choose the gas among the following which turns line water milky:

Question 47

47. Sodium metal cannot be stored under

Answer

Kerosene oil

Question 48

48. Chile saltpeter has the chemical formula

Answer

Na₂CO₃. H₂O

Answer

Na₂B₄O₇

Question 49

49. Main process for the manufacture of Na₃CO₃ is

Answer

Castner process

Answer

Solvay process

Answer

Down process

Answer

Nelson process

Question 50

50. CO2 is gas while SiO2 is solid at room temperature.

Answer

Silicon has all sigma bonds

Answer

CO2 is an independent molecule while SiO2 has network covalent structure

Answer

Carbon is non-metal while silicon is semi-metal

Answer

CO2 forms multiple bond while silicon does not form multiple bonds

Question 51

51. Choose the element which does not belong to group II A of the periodic table

Question 52

52. Which of the following imparts violet colouration to the non-luminous flame of Bunsen burner?

Question 53

53. Plaster of Paris is a hydrate of

Question 54

54. Chile Salt peter is

Answer

Na₂S₂O₃

Answer

Na₂SO₄

Question 55

55. Which of the following in rain water is responsible for weathering of rocks?

Answer

Noble gases

Question 56

56. Bleaching action of bleaching powder is due to the liberation of

Question 57

57. Metallic luster exhibited by Na can be explained by

Answer

Diffusion of sodium ions

Answer

Existence of body centered cubic lattice

Answer

Excitation of free protons

Answer

Oscillation of loose electrons

Question 58

58. Dolomite has the composition

Answer

KCL.MgCL₂.6H₂O

Answer

CaCl₂.MgCl₂.6H₂O

Answer

CaCO₃.MgCO₃

Answer

Na₃AIF₆

Question 59

59. Sodium reacts with water more vigorously than lithium because

Answer

It is more electropositive

Answer

It is more electronegative

Answer

It has higher atomic weight

Answer

It is a metal

Question 60

60. Which is most abundant alkaline metal in earth crust?

Question 61

61. Silicon is an important constituent of

Answer

Chlorophyll

Answer

Haemoglbin

Question 62

62. In the manufacture of cement which of the following is used?

Answer

Lime stone and silica

Answer

Lime stone and gypsum

Answer

Clay and silica

Answer

Lime stone and clay

Question 63

63. Calcium cyananmide on treatment with steam under pressure gives NH₃ and

Answer

Calcium hydroxide

Answer

Calcium bicarbonate

Answer

Calcium oxide

Answer

Calcium carbonate

Question 64

64. Leblanc process is employed in the manufacture of

Answer

Plaster of Paris

Answer

Baking soda

Answer

Washing soda

Answer 127

Atomic radii

Answer 128

Atomic volume

Answer 129

Electropositivity

Answer 130

Al has greater ionization potential

Answer 131

Incomplete p-subshell

Answer 132

Al has larger radius

Answer 133

High charge in nucleus

Answer 134

Soil porosity

Answer 135

Alkalinity of soil

Answer 136

Proper growth of plants

Answer 137

Aqueous NaoH

Answer 138

None of these

Answer 139

High nuclear charge and ionization

Answer 140

High nuclear charge

Answer 141

High ionization potential

Answer 142

None of these

Answer 143

Could not apply

Answer 144

Limestone, clay and sand

Answer 145

Limestone, gypsum and alumina

Answer 146

Limestone, clay and gypsum

Answer 147

Limestone, gypsum and sand

Answer 148

Al₂O₃. SiF₄

Answer 149

Al₂O₃. 2SiO₂. 2H₂O

Answer 150

Al₂O₃. 2H₂O

Answer 151

Baryata solution

Answer 152

Caustic soda

Answer 153

Slaked lime

Answer 154

Caustic potash

Answer 155

Na₂B₄O₇. 4G₂O

Answer 156

Ca₂B₆O₁₁. 5H₂O

Answer 157

NaOH. B₂O₃

Answer 158

Na₂B₄O₇. 10H₂O

Answer 159

Al₂F₂SiO₄

Answer 160

H₂Mg₃(SiO₃)₄

Answer 161

Na₃AlF₆

Answer 162

Magnesium and copper

Answer 163

Magnesium and sodium

Answer 164

Magnesium and barium

Answer 165

Magnesium and potassium

Answer 166

Na₂CO₃

Answer 167

Square planar

Answer 168

Square pyramid (carbon at apex)

Answer 169

None of these

Answer 170

Irregular tetrahedron

Answer 171

Fe form mono and divalent ions

Answer 172

It is a noble metal

Answer 173

Iron undergoes reaction easily with water

Answer 174

Oxygen forms a protective reaction easily with water

Answer 175

As insulator

Answer 176

To remove air bubbles from molten metal

Answer 177

As nitro meter

Answer 178

To produce alloy

Answer 179

On heating it melts in its water of crystallization

Answer 180

Its aqueous sol. Is basic in nature

Answer 181

It is used in dyeing industry

Answer 182

Its empirical formula is KAl(SO₄). 12H₂O

Answer 183

Na₃ALF₆

Answer 184

Al₂O₃. H₂O

Answer 185

Al₂O₃.₂H₂O

Answer 186

Na₂CO₃

Answer 187

Pb(OH)₂.2PbCO₃

Answer 188

Ca(HCO₃)₂

Answer 189

Aluminum oxide

Answer 190

Sodium tetra aluminate

Answer 191

Sodium meta-aluminate

Answer 192

Aluminum hydroxide

Answer 193

Molecular addition compounds

Answer 194

Semiconductors

Answer 195

Ionic compounds

Answer 196

Molecular crystals

Answer 197

Low electro negativity

Answer 198

Low ionization energy

Answer 199

Low atomic volume

Answer 200

Low density

Answer 201

It is not true

Answer 202

It is a conductor of heat

Answer 203

It is a good reflector of radiant energy

Answer 204

It is a conductor of electricity

Answer 205

Zinc sulphate

Answer 206

Barium sulphate

Answer 207

Sodium sulphate

Answer 208

Potassium sulphate

Answer 209

None of these

Answer 210

Al₂O₃. 2H₂O

Answer 211

Al₂O₃. SiF₄

Answer 212

Na₃BO₃

Answer 213

Na₂B₄O₇

Answer 214

In tanning of leather

Answer 215

As a mordant is dyeing

Answer 216

As an insecticide

Answer 217

In purification of water

Answer 218

Hg₂Cl₂

Answer 219

Carbon atoms of each plane have sp²

Answer 220

Carbon atoms have covalent bonds

Answer 221

There are Van der wall’s forces of attraction between the planes of c atoms

Answer 222

It has delocalized mobile electron

Answer 223

Alkaline earth metals

Answer 224

Alkali metals

Answer 225

Metalloids

Answer 226

Tribasic acid

Answer 227

Monobasic acid

Answer 228

Dibasic acid

Answer 229

None of these

Answer 230

N₂ as well as CO₂

Answer 231

Amphoteric

Answer 232

Acidic solution

Answer 233

None is correct

Answer 234

It reacts readily with oxygen of the air at room temperature

Answer 235

Its powder form reacts with O₂ and N₂ of air at 800C

Answer 236

It reacts with oxygen of air at high temperature (2000c)

Answer 237

Calcium carbonate

Answer 238

Colemanite

Answer 239

Boric acid

Answer 240

Molten NaCl

Answer 241

Green in colour

Answer 242

Used to prepare chemical garden

Answer 243

Low melting

Answer 244

Heat resistant

Answer 245

Li, Mg, Ca

Answer 246

Li, Na, Be

Answer 247

All have same products

Answer 248

Baeyer’s process

Answer 249

Serpeck’s process

Answer 250

Hoop’s process

Answer 251

Electrolytic process

Answer 252

Graphite is the hardest which lamp black is the softest

Answer 253

Diamond is the hardest and graphite is the softest

Answer 254

Coal is the hardest and coke is the softest

Answer 255

Diamond is the hardest and coke is the softest

Answer 256

Na₂B₄O₇

Answer 257

Na₂B₄O₇. 10H₂O

Answer 258

Na₂B₃O₆. 10H₂O

Answer 259

Na₂B₄O₇.5H₂O

Answer 260

Termite process

Answer 261

Haber process

Answer 262

Contact process

Answer 263

Hall process

Answer 264

White crystalline sublime solid

Answer 265

White amorphous solid

Answer 266

White crystalline solid

Answer 267

None of these

Answer 268

KH₂Al₃(SiO₄)₃

Answer 269

NaAlSiO₄. 3H₂O

Answer 270

NaKSiO₄. 10H₂O

Answer 271

K2HAL(SiO₄)₃

Answer 272

Sodium metal

Answer 273

Sodium bicarbonate

Answer 274

Sodium carbonate

Answer 275

Sodium hydroxide

Answer 276

Na₂SiO₃ and SiO₂

Answer 277

Na₂SiO₃ and CaSiO₃

Answer 278

Na₂O and SiO₂

Answer 279

Na₂CiO₃ and CO₂

Answer 280

Amphoteric oxide

Answer 281

Acidic oxide

Answer 282

Basic oxide

Answer 283

It does not exists

Answer 284

Third group

Answer 285

First transition series

Answer 286

First group

Answer 287

Fifth group

Answer 288

Mg(NO₃)₂

Answer 289

Sr(NO₃)₂

Answer 290

Be(NO₃)₂

Answer 291

As a general drying agent

Answer 292

In drying of benzene

Answer 293

In drying of alcohols

Answer 294

In drying of ammonia solution

Answer 295

Highly soluble in water at all temperatures.

Answer 296

Sparingly soluble in cold water at all temperatures

Answer 297

Readily soluble in cold water

Answer 298

Sparingly soluble in cold water but readily soluble in hot water

Answer 299

s – or – p

Answer 300

d – only

Answer 301

f – only

Answer 302

Both d – and f –

Answer 303

None of these

Answer 304

Amphoteric

Answer 305

Exothermic reaction

Answer 306

Neither exothermic nor endothermic

Answer 307

Endothermic reaction

Answer 308

Weakly basic

Answer 309

Very strongly basic

Answer 310

Amphoteric

Answer 311

H₂B₄O₇

Answer 312

H₆B₄O₉

Answer 313

Lower ionization energy

Answer 314

Greater hardness

Answer 315

Smaller ionic radii

Answer 316

High melting point

Total Questions:	155
Time Allowed:	60 Minutes
Total Marks:	155
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