Chemistry S-Block Elements Online Mcqs Test

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Question 1

1. Main process for the manufacture of Na₃CO₃ is

Answer

Solvay process

Answer

Down process

Answer

Nelson process

Answer

Castner process

Question 2

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

Answer

Zinc oxide

Answer

Magnesium oxide

Answer

Nitrogen pent oxide

Answer

Aluminum oxide

Question 3

3. The order of alkali metals is

Answer

Li, Na, K, Rb, Cs, Fr

Answer

Fr, Li, Rb, K, Na, Cs

Answer

Na, K, Li, Rb, Fe, Cs

Answer

Li, Na, Cs, K, Rb, Fr

Question 4

4. Sodium reacts with water more vigorously than lithium because

Answer

It has higher atomic weight

Answer

It is more electropositive

Answer

It is a metal

Answer

It is more electronegative

Question 5

5. BF₃ acts as acid according to the concept of

Question 6

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

Question 7

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

Question 8

8. Which one does not belong to alkaline earth metal?

Question 9

9. Al is more reactive than Fe but Al is less easily corroded than Fe because

Answer

Iron undergoes reaction easily with water

Answer

It is a noble metal

Answer

Fe form mono and divalent ions

Answer

Oxygen forms a protective reaction easily with water

Question 10

10. Metallic luster exhibited by Na can be explained by

Answer

Existence of body centered cubic lattice

Answer

Excitation of free protons

Answer

Diffusion of sodium ions

Answer

Oscillation of loose electrons

Question 11

11. Silicon is found in nature in the form of

Answer

Only silicates

Answer

Silica or siticates

Question 12

12. A pseudo solid is

Question 13

13. The chief are of aluminum is

Answer

Al₂O₃. H₂O

Answer

Al₂O₃.₂H₂O

Answer

Na₃ALF₆

Question 14

14. 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 15

15. Silicon is an important constituent of

Answer

Haemoglbin

Answer

Chlorophyll

Question 16

16. The formula of sodium meta borate is

Answer

Na₂B₄O₇

Answer

Na₃BO₃

Question 17

17. H₃BO₃ is a

Answer

Monobasic acid

Answer

Tribasic acid

Answer

None of these

Answer

Dibasic acid

Question 18

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

Answer

As compared to iron, aluminum has greater affinity for oxygen

Answer

Reaction between iron and oxygen is endothermic

Answer

As compared to aluminum, iron has greater affinity for oxygen

Answer

Refraction between aluminum and oxygen is endothermic

Question 19

19. 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 ionization energy increases

Answer

Their atomic size decreases

Answer

Their metallic character decreases

Answer

The stability of +2 oxidation state increases

Question 20

20. Plaster of Paris is a hydrate of

Question 21

21. Because of its ability to combine with both oxygen and nitrogen aluminum metal is used

Answer

As insulator

Answer

To remove air bubbles from molten metal

Answer

To produce alloy

Answer

As nitro meter

Question 22

22. Special features of borate glass is that it is

Answer

Used to prepare chemical garden

Answer

Green in colour

Answer

Heat resistant

Answer

Low melting

Question 23

23. Metals belonging to the same group in the periodic table are

Answer

Magnesium and copper

Answer

Magnesium and barium

Answer

Magnesium and sodium

Answer

Magnesium and potassium

Question 24

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

Answer

Noble gases

Question 25

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

Question 26

26. Red lead is

Question 27

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

Answer

CO2 is an independent molecule while SiO2 has network covalent structure

Answer

CO2 forms multiple bond while silicon does not form multiple bonds

Answer

Carbon is non-metal while silicon is semi-metal

Answer

Silicon has all sigma bonds

Question 28

28. Which is the weakest reducing agent?

Question 29

29. The aqueous solution of potash alum is

Answer

None of these

Question 30

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

Question 31

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

Question 32

32. The process of aluminum extraction is called

Answer

Termite process

Answer

Hall process

Answer

Contact process

Answer

Haber process

Question 33

33. Aluminum can jam radar due to

Answer

It is a good reflector of radiant energy

Answer

It is not true

Answer

It is a conductor of heat

Answer

It is a conductor of electricity

Question 34

34. Which halide has highest melting point?

Question 35

35. Microcosmic salt is

Answer

Na(NH₄)HPO₄.4H₂O

Answer

Na(NH₄). H₂O

Answer

HPO₄.4H₂O

Answer

K(NH₄)HPO₃. 2H₂O

Question 36

36. The formula of Nitre is

Answer

Na₂CO₃

Question 37

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

Question 38

38. Nitrates of which elements give same products

Answer

Li, Na, Be

Answer

Li, Mg, Ca

Answer

All have same products

Question 39

39. Chile Salt peter is

Answer

Na₂S₂O₃

Answer

Na₂SO₄

Question 40

40. Choose the correct statement

Answer

Coal is the hardest and coke is the softest

Answer

Graphite is the hardest which lamp black is the softest

Answer

Diamond is the hardest and graphite is the softest

Answer

Diamond is the hardest and coke is the softest

Question 41

41. Which one is formula of borax?

Answer

Na₂B₄O₇. 10H₂O

Answer

NaOH. B₂O₃

Answer

Ca₂B₆O₁₁. 5H₂O

Answer

Na₂B₄O₇. 4G₂O

Question 42

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

Question 43

43. The formula of china clay is

Answer

Al₂O₃. SiF₄

Answer

Al₂O₃. 2SiO₂. 2H₂O

Answer

Al₂O₃. 2H₂O

Question 44

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

Answer

Sodium sulphate

Answer

Zinc sulphate

Answer

Potassium sulphate

Answer

Barium sulphate

Question 45

45. Chile saltpeter has the chemical formula

Answer

Na₂B₄O₇

Answer

Na₂CO₃. H₂O

Question 46

46. The elements having highest melting point is

Question 47

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

Answer

Lime stone and gypsum

Answer

Lime stone and clay

Answer

Lime stone and silica

Answer

Clay and silica

Question 48

48. The chemical composition of white lead is

Answer

Na₂CO₃

Answer

Pb(OH)₂.2PbCO₃

Question 49

49. Setting of cement is an

Answer

Neither exothermic nor endothermic

Answer

Endothermic reaction

Answer

Exothermic reaction

Question 50

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

Answer

Do not show definite trend

Answer

Remain constant

Question 51

51. Magnesium keeps on burning in

Answer

N₂ as well as CO₂

Question 52

52. Leblanc process is employed in the manufacture of

Answer

Baking soda

Answer

Plaster of Paris

Answer

Washing soda

Question 53

53. Bleaching powder is a compound having a formula

Question 54

54. Galena is an ore of

Question 55

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

Question 56

56. Borax is a white crystalline solid and it is

Answer

Insoluble in water

Answer

Soluble only in organic solvents

Answer

More soluble in cold water

Answer

More soluble in hot water

Question 57

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

Answer

Na₃BO₃

Answer

Na₂B₄O₇

Answer

Na₂HBO₃

Question 58

58. Anodizing of Al is said when

Answer

Aluminum coated electrically with aluminum oxide

Answer

Aluminum obtained at anode

Answer

Aluminum prepared electrolytically

Answer

Aluminum allay containing 95% Al

Question 59

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

Question 60

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

Question 61

61. 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 62

62. White lead is

Answer

Basic lead acetate

Answer

Basic lead carbonate

Answer

Acidic lead carbonate

Answer

Basic lead hydroxide

Question 63

63. Which of the following gases burns with a blue flame?

Question 64

64. The formula of calcium cyanamide is

Answer 134

Combining with water

Answer 135

Giving off CO₂

Answer 136

Giving out water

Answer 137

Changing into CaCO₃

Answer 138

In drying of alcohols

Answer 139

In drying of ammonia solution

Answer 140

In drying of benzene

Answer 141

As a general drying agent

Answer 142

Limestone, clay and gypsum

Answer 143

Limestone, gypsum and sand

Answer 144

Limestone, clay and sand

Answer 145

Limestone, gypsum and alumina

Answer 146

White amorphous solid

Answer 147

None of these

Answer 148

White crystalline solid

Answer 149

White crystalline sublime solid

Answer 150

f – only

Answer 151

Both d – and f –

Answer 152

s – or – p

Answer 153

d – only

Answer 154

Al₂O₃. SiF₄

Answer 155

Al₂O₃. 2H₂O

Answer 156

None of these

Answer 157

H₆B₄O₉

Answer 158

H₂B₄O₇

Answer 159

High ionization potential

Answer 160

High nuclear charge and ionization

Answer 161

None of these

Answer 162

High nuclear charge

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

High melting point

Answer 168

Lower ionization energy

Answer 169

Smaller ionic radii

Answer 170

Greater hardness

Answer 171

Could not apply

Answer 172

Molten NaCl

Answer 173

In soda bottles

Answer 174

An antiseptic medicine

Answer 175

For washing of eyes

Answer 176

For enamels and glazes

Answer 177

Sodium carbonate

Answer 178

Sodium bicarbonate

Answer 179

Sodium metal

Answer 180

Sodium hydroxide

Answer 181

Low ionization energy

Answer 182

Low density

Answer 183

Low atomic volume

Answer 184

Low electro negativity

Answer 185

None of these

Answer 186

Amphoteric

Answer 187

Semiconductors

Answer 188

Molecular crystals

Answer 189

Ionic compounds

Answer 190

Molecular addition compounds

Answer 191

Calcium carbonate

Answer 192

Colemanite

Answer 193

Boric acid

Answer 194

Highly soluble in water at all temperatures.

Answer 195

Sparingly soluble in cold water at all temperatures

Answer 196

Sparingly soluble in cold water but readily soluble in hot water

Answer 197

Readily soluble in cold water

Answer 198

Al has greater ionization potential

Answer 199

Incomplete p-subshell

Answer 200

Al has larger radius

Answer 201

High charge in nucleus

Answer 202

They have smaller size

Answer 203

They are more reactive

Answer 204

They have greater atomic size

Answer 205

It does not exists

Answer 206

Amphoteric oxide

Answer 207

Basic oxide

Answer 208

Acidic oxide

Answer 209

CaCl₂.MgCl₂.6H₂O

Answer 210

CaCO₃.MgCO₃

Answer 211

KCL.MgCL₂.6H₂O

Answer 212

Na₃AIF₆

Answer 213

Carbrandum

Answer 214

Sr(NO₃)₂

Answer 215

Mg(NO₃)₂

Answer 216

Be(NO₃)₂

Answer 217

Aqueous NaoH

Answer 218

Fifth group

Answer 219

Third group

Answer 220

First transition series

Answer 221

First group

Answer 222

Na₂ CO₃

Answer 223

NaAlSiO₄. 3H₂O

Answer 224

NaKSiO₄. 10H₂O

Answer 225

KH₂Al₃(SiO₄)₃

Answer 226

K2HAL(SiO₄)₃

Answer 227

In purification of water

Answer 228

As an insecticide

Answer 229

In tanning of leather

Answer 230

As a mordant is dyeing

Answer 231

Na₂co₃

Answer 232

Aluminum peroxide

Answer 233

Sodium meta aluminate

Answer 234

Sodium aluminum hydroxide

Answer 235

Sodium aluminum hydride

Answer 236

Calcium oxide

Answer 237

Calcium carbonate

Answer 238

Calcium bicarbonate

Answer 239

Calcium hydroxide

Answer 240

It has delocalized mobile electron

Answer 241

Carbon atoms of each plane have sp²

Answer 242

Carbon atoms have covalent bonds

Answer 243

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

Answer 244

Hg₂Cl₂

Answer 245

None of these

Answer 246

Na₂O and SiO₂

Answer 247

Na₂CiO₃ and CO₂

Answer 248

Na₂SiO₃ and CaSiO₃

Answer 249

Na₂SiO₃ and SiO₂

Answer 250

Kerosene oil

Answer 251

Caustic potash

Answer 252

Caustic soda

Answer 253

Slaked lime

Answer 254

Baryata solution

Answer 255

Soil porosity

Answer 256

Alkalinity of soil

Answer 257

Proper growth of plants

Answer 258

Amphoteric

Answer 259

Acidic solution

Answer 260

1s2 2s2 2p6 3s2 3p1

Answer 261

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

Answer 262

1s2 2s2 2p3

Answer 263

1s2 2s2 2p4

Answer 264

Na₂CO₃. 10H₂O

Answer 265

Na₂CO₃. 3H₂O

Answer 266

Na₂CO₃. 7H₂O

Answer 267

Na₂CO₃.

Answer 268

Square pyramid (carbon at apex)

Answer 269

Irregular tetrahedron

Answer 270

Square planar

Answer 271

None of these

Answer 272

Potassium sulphate

Answer 273

Barium sulphate

Answer 274

Sodium sulphate

Answer 275

Zinc sulphate

Answer 276

None is correct

Answer 277

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

Answer 278

It reacts readily with oxygen of the air at room temperature

Answer 279

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

Answer 280

Combination with atmospheric CO₂

Answer 281

Hydration to yield another hydrate

Answer 282

Dehydration

Answer 283

Oxidation with atmospheric oxygen

Answer 284

Na₂So₄

Answer 285

Hydraulic brakes

Answer 286

Antifreeze

Answer 287

Water repellent

Answer 288

Lubricants

Answer 289

Alkaline earth metals

Answer 290

Alkali metals

Answer 291

Metalloids

Answer 292

D – block

Answer 293

S – block

Answer 294

F – block

Answer 295

P – block

Answer 296

Na₂B₄O₇

Answer 297

Na₂B₄O₇.5H₂O

Answer 298

Na₂B₄O₇. 10H₂O

Answer 299

Na₂B₃O₆. 10H₂O

Answer 300

On heating it melts in its water of crystallization

Answer 301

It is used in dyeing industry

Answer 302

Its empirical formula is KAl(SO₄). 12H₂O

Answer 303

Its aqueous sol. Is basic in nature

Answer 304

Aluminum hydroxide

Answer 305

Sodium tetra aluminate

Answer 306

Aluminum oxide

Answer 307

Sodium meta-aluminate

Answer 308

Na₃AlF₆

Answer 309

Al₂F₂SiO₄

Answer 310

H₂Mg₃(SiO₃)₄

Answer 311

Electropositivity

Answer 312

Atomic volume

Answer 313

Atomic radii

Answer 314

Weakly basic

Answer 315

Amphoteric

Answer 316

Very strongly basic

Total Questions:	155
Time Allowed:	60 Minutes
Total Marks:	155
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Important Chemistry S-Block Elements Question and Answer

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