Chemistry S-Block Elements Online Mcqs Test

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Question 1

1. Dolomite has the composition

Answer

CaCO₃.MgCO₃

Answer

CaCl₂.MgCl₂.6H₂O

Answer

KCL.MgCL₂.6H₂O

Answer

Na₃AIF₆

Question 2

2. Main process for the manufacture of Na₃CO₃ is

Answer

Solvay process

Answer

Nelson process

Answer

Down process

Answer

Castner process

Question 3

3. What is true about reactivity of aluminum?

Answer

It reacts readily with oxygen of the air at room temperature

Answer

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

Answer

None is correct

Answer

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

Question 4

4. Which one of the following has the lowest boiling point?

Question 5

5. Red lead is

Question 6

6. Substance which is found in dried up lakes of Tibet and California is

Answer

Colemanite

Answer

Calcium carbonate

Answer

Boric acid

Question 7

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

Question 8

8. In diaphragm cell, hydrogen is discharged by

Question 9

9. Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When carbon dioxide is bubbled through A, it turns cloudy. What is the chemical formula of A?

Answer

Ca(HCO₃)₂

Question 10

10. AlCl₃ exist as dimmer because

Answer

Al has larger radius

Answer

Al has greater ionization potential

Answer

High charge in nucleus

Answer

Incomplete p-subshell

Question 11

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

Question 12

12. Causticisation process is used for the preparation of

Answer

Caustic soda

Answer

Slaked lime

Answer

Caustic potash

Answer

Baryata solution

Question 13

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

Answer

Na₂co₃

Question 14

14. The process of aluminum extraction is called

Answer

Hall process

Answer

Contact process

Answer

Termite process

Answer

Haber process

Question 15

15. Borax is a white crystalline solid and it is

Answer

More soluble in hot water

Answer

More soluble in cold water

Answer

Soluble only in organic solvents

Answer

Insoluble in water

Question 16

16. Cesium oxide will be

Answer

Very strongly basic

Answer

Amphoteric

Answer

Weakly basic

Question 17

17. The purification method of bauxite containing iron oxide as impurity is known as

Answer

Baeyer’s process

Answer

Hoop’s process

Answer

Electrolytic process

Answer

Serpeck’s process

Question 18

18. Portland cement is manufactured by using

Answer

Limestone, gypsum and sand

Answer

Limestone, gypsum and alumina

Answer

Limestone, clay and sand

Answer

Limestone, clay and gypsum

Question 19

19. Alkali and alkaline earth metals show increasing trend down the group in

Answer

Atomic volume

Answer

Atomic radii

Answer

Electropositivity

Question 20

20. The element having highest electronegativity among the following is

Question 21

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

Question 22

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

Answer

Noble gases

Question 23

23. Which of the following compounds has the lowest anion to cation size ratio?

Question 24

24. Gypsum is applied to the soil as a source of

Answer

Could not apply

Question 25

25. The oxides of born and silicon are

Answer

Acidic solution

Answer

Amphoteric

Question 26

26. Potassium is kept in

Question 27

27. Keeping in view the comparison of alkali metals with alkaline earth metals, the alkali metals have

Answer

Smaller ionic radii

Answer

Lower ionization energy

Answer

High melting point

Answer

Greater hardness

Question 28

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

Answer

Na₂HBO₃

Answer

Na₃BO₃

Answer

Na₂B₄O₇

Question 29

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

Answer

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

Answer

1s2 2s2 2p6 3s2 3p1

Answer

1s2 2s2 2p3

Answer

1s2 2s2 2p4

Question 30

30. Which of the following is most dense?

Question 31

31. A pseudo solid is

Question 32

32. Alum is not used

Answer

In tanning of leather

Answer

As a mordant is dyeing

Answer

As an insecticide

Answer

In purification of water

Question 33

33. Bleaching powder is a compound having a formula

Question 34

34. Which of the following statements is not true about potash alum?

Answer

Its aqueous sol. Is basic in nature

Answer

Its empirical formula is KAl(SO₄). 12H₂O

Answer

It is used in dyeing industry

Answer

On heating it melts in its water of crystallization

Question 35

35. The common mineral of alkali metal sodium is borax which has formula.

Answer

Na₂B₃O₆. 10H₂O

Answer

Na₂B₄O₇

Answer

Na₂B₄O₇.5H₂O

Answer

Na₂B₄O₇. 10H₂O

Question 36

36. Down’s cell is used to prepare

Answer

Sodium hydroxide

Answer

Sodium carbonate

Answer

Sodium metal

Answer

Sodium bicarbonate

Question 37

37. The aqueous solution of potash alum is

Answer

None of these

Question 38

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

Answer

Reaction between iron and oxygen is endothermic

Answer

As compared to aluminum, iron has greater affinity for oxygen

Answer

As compared to iron, aluminum has greater affinity for oxygen

Answer

Refraction between aluminum and oxygen is endothermic

Question 39

39. Which of the most basic of the following?

Question 40

40. Graphite is a good conductor of electricity. The reason is that

Answer

It has delocalized mobile electron

Answer

Carbon atoms have covalent bonds

Answer

Carbon atoms of each plane have sp²

Answer

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

Question 41

41. Which is the chemical formula of mica?

Answer

K2HAL(SiO₄)₃

Answer

NaKSiO₄. 10H₂O

Answer

NaAlSiO₄. 3H₂O

Answer

KH₂Al₃(SiO₄)₃

Question 42

42. Sodium metal cannot be stored under

Answer

Kerosene oil

Question 43

43. Chile Salt peter is

Answer

Na₂SO₄

Answer

Na₂S₂O₃

Question 44

44. Leblanc process is employed in the manufacture of

Answer

Washing soda

Answer

Baking soda

Answer

Plaster of Paris

Question 45

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

Answer

They are more reactive

Answer

They have greater atomic size

Answer

They have smaller size

Question 46

46. The formula of china clay is

Answer

Al₂O₃. 2SiO₂. 2H₂O

Answer

Al₂O₃. SiF₄

Answer

Al₂O₃. 2H₂O

Question 47

47. The metal which is used in thermite process because of its activity is

Question 48

48. In which of the following elements + 1 oxidation state is more stable than +3

Question 49

49. Special features of borate glass is that it is

Answer

Heat resistant

Answer

Used to prepare chemical garden

Answer

Green in colour

Answer

Low melting

Question 50

50. 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 51

51. 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 atomic size decreases

Answer

Their ionization energy increases

Answer

Their metallic character decreases

Answer

The stability of +2 oxidation state increases

Question 52

52. Magnesium keeps on burning in

Answer

N₂ as well as CO₂

Question 53

53. Which of the following is different from the other three oxides?

Question 54

54. BF₃ acts as acid according to the concept of

Question 55

55. Which element is used in thermite process due to its reactivity?

Question 56

56. One of the outstanding features of boron is its ability to form

Answer

Semiconductors

Answer

Molecular addition compounds

Answer

Ionic compounds

Answer

Molecular crystals

Question 57

57. Which is formula of orthoboric acid?

Answer

H₆B₄O₉

Answer

H₂B₄O₇

Question 58

58. Which of the following is monovalent?

Answer

Alkaline earth metals

Answer

Alkali metals

Answer

Metalloids

Question 59

59. The oxides of beryllium are

Answer

None of these

Answer

Amphoteric

Question 60

60. Which of the following conceivable structures for CCl₄ will have a zero dipole moment?

Answer

Square planar

Answer

None of these

Answer

Irregular tetrahedron

Answer

Square pyramid (carbon at apex)

Question 61

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

Answer

Barium sulphate

Answer

Sodium sulphate

Answer

Zinc sulphate

Answer

Potassium sulphate

Question 62

62. Which is the weakest reducing agent?

Question 63

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

Question 64

64. The element having least value of ionization energy among the following elements is

Answer 136

None of these

Answer 137

In drying of alcohols

Answer 138

As a general drying agent

Answer 139

In drying of ammonia solution

Answer 140

In drying of benzene

Answer 141

Magnesium and sodium

Answer 142

Magnesium and barium

Answer 143

Magnesium and potassium

Answer 144

Magnesium and copper

Answer 145

Molten NaCl

Answer 146

Oxidation with atmospheric oxygen

Answer 147

Hydration to yield another hydrate

Answer 148

Dehydration

Answer 149

Combination with atmospheric CO₂

Answer 150

P – block

Answer 151

S – block

Answer 152

D – block

Answer 153

F – block

Answer 154

CO2 forms multiple bond while silicon does not form multiple bonds

Answer 155

Silicon has all sigma bonds

Answer 156

CO2 is an independent molecule while SiO2 has network covalent structure

Answer 157

Carbon is non-metal while silicon is semi-metal

Answer 158

Na₂CO₃. 7H₂O

Answer 159

Na₂CO₃. 3H₂O

Answer 160

Na₂CO₃. 10H₂O

Answer 161

Na₂CO₃.

Answer 162

Na₂ CO₃

Answer 163

It is a soft alkali metal

Answer 164

It has mobile electrons

Answer 165

It gives hydrogen with water

Answer 166

It has only one electron in the outermost orbit

Answer 167

Hg₂Cl₂

Answer 168

White amorphous solid

Answer 169

None of these

Answer 170

White crystalline solid

Answer 171

White crystalline sublime solid

Answer 172

Na₂CiO₃ and CO₂

Answer 173

Na₂SiO₃ and CaSiO₃

Answer 174

Na₂SiO₃ and SiO₂

Answer 175

Na₂O and SiO₂

Answer 176

Na₂CO₃

Answer 177

Neither exothermic nor endothermic

Answer 178

Endothermic reaction

Answer 179

Exothermic reaction

Answer 180

Aluminum prepared electrolytically

Answer 181

Aluminum obtained at anode

Answer 182

Aluminum allay containing 95% Al

Answer 183

Aluminum coated electrically with aluminum oxide

Answer 184

Mg(NO₃)₂

Answer 185

Sr(NO₃)₂

Answer 186

Be(NO₃)₂

Answer 187

It is a good reflector of radiant energy

Answer 188

It is a conductor of heat

Answer 189

It is a conductor of electricity

Answer 190

It is not true

Answer 191

Alkalinity of soil

Answer 192

Proper growth of plants

Answer 193

Soil porosity

Answer 194

Al₂O₃. 2H₂O

Answer 195

None of these

Answer 196

Al₂O₃. SiF₄

Answer 197

As insulator

Answer 198

To produce alloy

Answer 199

As nitro meter

Answer 200

To remove air bubbles from molten metal

Answer 201

Oscillation of loose electrons

Answer 202

Excitation of free protons

Answer 203

Diffusion of sodium ions

Answer 204

Existence of body centered cubic lattice

Answer 205

It has higher atomic weight

Answer 206

It is more electropositive

Answer 207

It is a metal

Answer 208

It is more electronegative

Answer 209

Acidic oxide

Answer 210

It does not exists

Answer 211

Basic oxide

Answer 212

Amphoteric oxide

Answer 213

Aqueous NaoH

Answer 214

Antifreeze

Answer 215

Lubricants

Answer 216

Hydraulic brakes

Answer 217

Water repellent

Answer 218

Giving off CO₂

Answer 219

Giving out water

Answer 220

Changing into CaCO₃

Answer 221

Combining with water

Answer 222

Sparingly soluble in cold water but readily soluble in hot water

Answer 223

Sparingly soluble in cold water at all temperatures

Answer 224

Highly soluble in water at all temperatures.

Answer 225

Readily soluble in cold water

Answer 226

Haemoglbin

Answer 227

Chlorophyll

Answer 228

Sodium sulphate

Answer 229

Zinc sulphate

Answer 230

Potassium sulphate

Answer 231

Barium sulphate

Answer 232

Li, Mg, Ca

Answer 233

Li, Na, Be

Answer 234

All have same products

Answer 235

Diamond is the hardest and graphite is the softest

Answer 236

Graphite is the hardest which lamp black is the softest

Answer 237

Coal is the hardest and coke is the softest

Answer 238

Diamond is the hardest and coke is the softest

Answer 239

Third group

Answer 240

First transition series

Answer 241

Fifth group

Answer 242

First group

Answer 243

Silica or siticates

Answer 244

Only silicates

Answer 245

Low electro negativity

Answer 246

Low ionization energy

Answer 247

Low atomic volume

Answer 248

Low density

Answer 249

Monobasic acid

Answer 250

Dibasic acid

Answer 251

None of these

Answer 252

Tribasic acid

Answer 253

Na₂CO₃. H₂O

Answer 254

Na₂B₄O₇

Answer 255

For enamels and glazes

Answer 256

An antiseptic medicine

Answer 257

For washing of eyes

Answer 258

In soda bottles

Answer 259

Na₃BO₃

Answer 260

Na₂B₄O₇

Answer 261

Clay and silica

Answer 262

Lime stone and clay

Answer 263

Lime stone and silica

Answer 264

Lime stone and gypsum

Answer 265

Na₂CO₃

Answer 266

Pb(OH)₂.2PbCO₃

Answer 267

Na₃AlF₆

Answer 268

H₂Mg₃(SiO₃)₄

Answer 269

Al₂F₂SiO₄

Answer 270

Aluminum peroxide

Answer 271

Sodium meta aluminate

Answer 272

Sodium aluminum hydride

Answer 273

Sodium aluminum hydroxide

Answer 274

Na₂So₄

Answer 275

Ca₂B₆O₁₁. 5H₂O

Answer 276

Na₂B₄O₇. 10H₂O

Answer 277

Na₂B₄O₇. 4G₂O

Answer 278

NaOH. B₂O₃

Answer 279

Na, K, Li, Rb, Fe, Cs

Answer 280

Li, Na, Cs, K, Rb, Fr

Answer 281

Li, Na, K, Rb, Cs, Fr

Answer 282

Fr, Li, Rb, K, Na, Cs

Answer 283

Aluminum hydroxide

Answer 284

Sodium tetra aluminate

Answer 285

Sodium meta-aluminate

Answer 286

Aluminum oxide

Answer 287

K(NH₄)HPO₃. 2H₂O

Answer 288

HPO₄.4H₂O

Answer 289

Na(NH₄). H₂O

Answer 290

Na(NH₄)HPO₄.4H₂O

Answer 291

Calcium oxide

Answer 292

Calcium bicarbonate

Answer 293

Calcium hydroxide

Answer 294

Calcium carbonate

Answer 295

Basic lead hydroxide

Answer 296

Basic lead carbonate

Answer 297

Basic lead acetate

Answer 298

Acidic lead carbonate

Answer 299

Remain constant

Answer 300

Do not show definite trend

Answer 301

High nuclear charge

Answer 302

High nuclear charge and ionization

Answer 303

High ionization potential

Answer 304

None of these

Answer 305

Carbrandum

Answer 306

It is a noble metal

Answer 307

Oxygen forms a protective reaction easily with water

Answer 308

Iron undergoes reaction easily with water

Answer 309

Fe form mono and divalent ions

Answer 310

Al₂O₃.₂H₂O

Answer 311

Al₂O₃. H₂O

Answer 312

Na₃ALF₆

Answer 313

s – or – p

Answer 314

f – only

Answer 315

Both d – and f –

Answer 316

d – only

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