Chemistry S-Block Elements Online Mcqs Test

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Question 1

1. Aluminum oxide is

Answer

Amphoteric oxide

Answer

Basic oxide

Answer

It does not exists

Answer

Acidic oxide

Question 2

2. Plaster of Paris hardens by

Answer

Giving out water

Answer

Changing into CaCO₃

Answer

Giving off CO₂

Answer

Combining with water

Question 3

3. Dolomite has the composition

Answer

CaCl₂.MgCl₂.6H₂O

Answer

KCL.MgCL₂.6H₂O

Answer

CaCO₃.MgCO₃

Answer

Na₃AIF₆

Question 4

4. The reactivity of the alkali metal sodium with water, is made use of

Answer

In drying of benzene

Answer

In drying of alcohols

Answer

In drying of ammonia solution

Answer

As a general drying agent

Question 5

5. Which one of the following substances conducts electricity by the movement of ions?

Answer

Molten NaCl

Question 6

6. What is true about reactivity of aluminum?

Answer

It reacts readily with oxygen of the air at room temperature

Answer

None is correct

Answer

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

Answer

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

Question 7

7. The element having highest electronegativity among the following is

Question 8

8. The elements which belong to group IIIA are called

Answer

F – block

Answer

P – block

Answer

S – block

Answer

D – block

Question 9

9. Causticisation process is used for the preparation of

Answer

Baryata solution

Answer

Slaked lime

Answer

Caustic soda

Answer

Caustic potash

Question 10

10. The formula of Nitre is

Answer

Na₂CO₃

Question 11

11. A combustible gas is liberated when caustic soda solution is heated with

Question 12

12. A pseudo solid is

Question 13

13. NaNO₃ decomposes on heating at high temperature to give

Question 14

14. The oxides of born and silicon are

Answer

Acidic solution

Answer

Amphoteric

Question 15

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

Question 16

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

Question 17

17. Which one of the following sulphate is not soluble in water?

Answer

Sodium sulphate

Answer

Zinc sulphate

Answer

Barium sulphate

Answer

Potassium sulphate

Question 18

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

Answer

Atomic radii

Answer

Electropositivity

Answer

Atomic volume

Question 19

19. Which of the following mineral does not contain Al?

Question 20

20. 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

Refraction between aluminum and oxygen is endothermic

Answer

Reaction between iron and oxygen is endothermic

Answer

As compared to iron, aluminum has greater affinity for oxygen

Question 21

21. Potassium is kept in

Question 22

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

Question 23

23. Born is soil has been considered micronutrient for

Answer

Alkalinity of soil

Answer

Soil porosity

Answer

Proper growth of plants

Question 24

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

Question 25

25. Which is the chemical formula of mica?

Answer

K2HAL(SiO₄)₃

Answer

NaAlSiO₄. 3H₂O

Answer

NaKSiO₄. 10H₂O

Answer

KH₂Al₃(SiO₄)₃

Question 26

26. The most abundant element in III A group in earth crust is?

Question 27

27. Down’s cell is used to prepare

Answer

Sodium metal

Answer

Sodium carbonate

Answer

Sodium bicarbonate

Answer

Sodium hydroxide

Question 28

28. Alkali metal hydroxides are stable to heat except

Question 29

29. The formula of china clay is

Answer

Al₂O₃. 2SiO₂. 2H₂O

Answer

Al₂O₃. SiF₄

Answer

Al₂O₃. 2H₂O

Question 30

30. Cesium oxide will be

Answer

Amphoteric

Answer

Very strongly basic

Answer

Weakly basic

Question 31

31. Which halide has highest melting point?

Question 32

32. Chile saltpeter has the chemical formula

Answer

Na₂CO₃. H₂O

Answer

Na₂B₄O₇

Question 33

33. Plaster of Paris is a hydrate of

Question 34

34. Which compound will show the highest lattice energy?

Question 35

35. BF₃ acts as acid according to the concept of

Question 36

36. Which of the following is a component of ruby?

Question 37

37. Silicon is found in nature in the form of

Answer

Silica or siticates

Answer

Only silicates

Question 38

38. Aluminum reacts with caustic soda to form

Answer

Sodium tetra aluminate

Answer

Sodium meta-aluminate

Answer

Aluminum oxide

Answer

Aluminum hydroxide

Question 39

39. Main process for the manufacture of Na₃CO₃ is

Answer

Castner process

Answer

Down process

Answer

Solvay process

Answer

Nelson process

Question 40

40. Which of the following alkali metal hydroxides is the strongest base?

Question 41

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

Question 42

42. Sodium conducts electricity because

Answer

It gives hydrogen with water

Answer

It has only one electron in the outermost orbit

Answer

It is a soft alkali metal

Answer

It has mobile electrons

Question 43

43. Red lead is

Question 44

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

Answer

Na₂B₄O₇

Answer

Na₂B₄O₇.5H₂O

Answer

Na₂B₃O₆. 10H₂O

Answer

Na₂B₄O₇. 10H₂O

Question 45

45. The process of aluminum extraction is called

Answer

Contact process

Answer

Termite process

Answer

Haber process

Answer

Hall process

Question 46

46. Which of the following is most dense?

Question 47

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

Answer

Boric acid

Answer

Colemanite

Answer

Calcium carbonate

Question 48

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

Question 49

49. Ammonia may be prepared by heating ammonium chloride with

Answer

Aqueous NaoH

Question 50

50. The order of alkali metals is

Answer

Fr, Li, Rb, K, Na, Cs

Answer

Li, Na, K, Rb, Cs, Fr

Answer

Li, Na, Cs, K, Rb, Fr

Answer

Na, K, Li, Rb, Fe, Cs

Question 51

51. Which is the most amphoteric?

Question 52

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

Answer

To remove air bubbles from molten metal

Answer

As insulator

Answer

To produce alloy

Answer

As nitro meter

Question 53

53. The oxides of beryllium are

Answer

None of these

Answer

Amphoteric

Question 54

54. The principle constituent of pyrex glass is

Question 55

55. Which is the formula of Chili Salt Peter?

Answer

Na₂So₄

Question 56

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

Question 57

57. Which is the weakest reducing agent?

Question 58

58. White lead is

Answer

Acidic lead carbonate

Answer

Basic lead carbonate

Answer

Basic lead hydroxide

Answer

Basic lead acetate

Question 59

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

Answer

None of these

Answer

Square planar

Answer

Square pyramid (carbon at apex)

Answer

Irregular tetrahedron

Question 60

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

Answer

Hoop’s process

Answer

Serpeck’s process

Answer

Baeyer’s process

Answer

Electrolytic process

Question 61

61. Aluminum can jam radar due to

Answer

It is a conductor of heat

Answer

It is a good reflector of radiant energy

Answer

It is not true

Answer

It is a conductor of electricity

Question 62

62. Galena is an ore of

Question 63

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

Question 64

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

Answer 116

As a mordant is dyeing

Answer 117

As an insecticide

Answer 118

In purification of water

Answer 119

In tanning of leather

Answer 120

None of these

Answer 121

1s2 2s2 2p3

Answer 122

1s2 2s2 2p4

Answer 123

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

Answer 124

1s2 2s2 2p6 3s2 3p1

Answer 125

Na₂O and SiO₂

Answer 126

Na₂SiO₃ and SiO₂

Answer 127

Na₂SiO₃ and CaSiO₃

Answer 128

Na₂CiO₃ and CO₂

Answer 129

Na₂B₄O₇. 4G₂O

Answer 130

Na₂B₄O₇. 10H₂O

Answer 131

Ca₂B₆O₁₁. 5H₂O

Answer 132

NaOH. B₂O₃

Answer 133

Excitation of free protons

Answer 134

Existence of body centered cubic lattice

Answer 135

Oscillation of loose electrons

Answer 136

Diffusion of sodium ions

Answer 137

Aluminum obtained at anode

Answer 138

Aluminum prepared electrolytically

Answer 139

Aluminum coated electrically with aluminum oxide

Answer 140

Aluminum allay containing 95% Al

Answer 141

Fe form mono and divalent ions

Answer 142

Iron undergoes reaction easily with water

Answer 143

It is a noble metal

Answer 144

Oxygen forms a protective reaction easily with water

Answer 145

Dehydration

Answer 146

Oxidation with atmospheric oxygen

Answer 147

Hydration to yield another hydrate

Answer 148

Combination with atmospheric CO₂

Answer 149

Be(NO₃)₂

Answer 150

Mg(NO₃)₂

Answer 151

Sr(NO₃)₂

Answer 152

Could not apply

Answer 153

An antiseptic medicine

Answer 154

In soda bottles

Answer 155

For washing of eyes

Answer 156

For enamels and glazes

Answer 157

None of these

Answer 158

White crystalline sublime solid

Answer 159

White amorphous solid

Answer 160

White crystalline solid

Answer 161

On heating it melts in its water of crystallization

Answer 162

Its aqueous sol. Is basic in nature

Answer 163

Its empirical formula is KAl(SO₄). 12H₂O

Answer 164

It is used in dyeing industry

Answer 165

Coal is the hardest and coke is the softest

Answer 166

Diamond is the hardest and graphite is the softest

Answer 167

Graphite is the hardest which lamp black is the softest

Answer 168

Diamond is the hardest and coke is the softest

Answer 169

Zinc sulphate

Answer 170

Barium sulphate

Answer 171

Sodium sulphate

Answer 172

Potassium sulphate

Answer 173

Ca(HCO₃)₂

Answer 174

Molecular crystals

Answer 175

Molecular addition compounds

Answer 176

Ionic compounds

Answer 177

Semiconductors

Answer 178

Sparingly soluble in cold water but readily soluble in hot water

Answer 179

Highly soluble in water at all temperatures.

Answer 180

Sparingly soluble in cold water at all temperatures

Answer 181

Readily soluble in cold water

Answer 182

They have smaller size

Answer 183

They have greater atomic size

Answer 184

They are more reactive

Answer 185

Al₂O₃. 2H₂O

Answer 186

None of these

Answer 187

Al₂O₃. SiF₄

Answer 188

N₂ as well as CO₂

Answer 189

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

Answer 190

Carbon atoms of each plane have sp²

Answer 191

It has delocalized mobile electron

Answer 192

Carbon atoms have covalent bonds

Answer 193

Noble gases

Answer 194

It is more electronegative

Answer 195

It is more electropositive

Answer 196

It has higher atomic weight

Answer 197

It is a metal

Answer 198

Aluminum oxide

Answer 199

Nitrogen pent oxide

Answer 200

Zinc oxide

Answer 201

Magnesium oxide

Answer 202

High nuclear charge and ionization

Answer 203

None of these

Answer 204

High nuclear charge

Answer 205

High ionization potential

Answer 206

Magnesium and barium

Answer 207

Magnesium and sodium

Answer 208

Magnesium and copper

Answer 209

Magnesium and potassium

Answer 210

Lime stone and silica

Answer 211

Lime stone and gypsum

Answer 212

Lime stone and clay

Answer 213

Clay and silica

Answer 214

None of these

Answer 215

Tribasic acid

Answer 216

Dibasic acid

Answer 217

Monobasic acid

Answer 218

Kerosene oil

Answer 219

Sodium aluminum hydride

Answer 220

Sodium aluminum hydroxide

Answer 221

Aluminum peroxide

Answer 222

Sodium meta aluminate

Answer 223

Their atomic size decreases

Answer 224

Their metallic character decreases

Answer 225

Their ionization energy increases

Answer 226

The stability of +2 oxidation state increases

Answer 227

Na₃ALF₆

Answer 228

Al₂O₃. H₂O

Answer 229

Al₂O₃.₂H₂O

Answer 230

Na₂CO₃.

Answer 231

Na₂CO₃. 7H₂O

Answer 232

Na₂CO₃. 3H₂O

Answer 233

Na₂CO₃. 10H₂O

Answer 234

Calcium hydroxide

Answer 235

Calcium bicarbonate

Answer 236

Calcium carbonate

Answer 237

Calcium oxide

Answer 238

Haemoglbin

Answer 239

Chlorophyll

Answer 240

Low electro negativity

Answer 241

Low ionization energy

Answer 242

Low density

Answer 243

Low atomic volume

Answer 244

Greater hardness

Answer 245

High melting point

Answer 246

Lower ionization energy

Answer 247

Smaller ionic radii

Answer 248

Na₂CO₃

Answer 249

Pb(OH)₂.2PbCO₃

Answer 250

Hydraulic brakes

Answer 251

Lubricants

Answer 252

Water repellent

Answer 253

Antifreeze

Answer 254

Na₂S₂O₃

Answer 255

Na₂SO₄

Answer 256

More soluble in hot water

Answer 257

Insoluble in water

Answer 258

More soluble in cold water

Answer 259

Soluble only in organic solvents

Answer 260

Carbrandum

Answer 261

Do not show definite trend

Answer 262

Remain constant

Answer 263

Baking soda

Answer 264

Washing soda

Answer 265

Plaster of Paris

Answer 266

Silicon has all sigma bonds

Answer 267

CO2 is an independent molecule while SiO2 has network covalent structure

Answer 268

Carbon is non-metal while silicon is semi-metal

Answer 269

CO2 forms multiple bond while silicon does not form multiple bonds

Answer 270

Hg₂Cl₂

Answer 271

Na₂co₃

Answer 272

H₂B₄O₇

Answer 273

H₆B₄O₉

Answer 274

Limestone, gypsum and sand

Answer 275

Limestone, clay and sand

Answer 276

Limestone, gypsum and alumina

Answer 277

Limestone, clay and gypsum

Answer 278

Na₂ CO₃

Answer 279

s – or – p

Answer 280

Both d – and f –

Answer 281

f – only

Answer 282

d – only

Answer 283

K(NH₄)HPO₃. 2H₂O

Answer 284

HPO₄.4H₂O

Answer 285

Na(NH₄)HPO₄.4H₂O

Answer 286

Na(NH₄). H₂O

Answer 287

Li, Mg, Ca

Answer 288

Li, Na, Be

Answer 289

All have same products

Answer 290

H₂Mg₃(SiO₃)₄

Answer 291

Na₃AlF₆

Answer 292

Al₂F₂SiO₄

Answer 293

Alkaline earth metals

Answer 294

Alkali metals

Answer 295

Metalloids

Answer 296

Na₂B₄O₇

Answer 297

Na₃BO₃

Answer 298

High charge in nucleus

Answer 299

Al has greater ionization potential

Answer 300

Incomplete p-subshell

Answer 301

Al has larger radius

Answer 302

Na₃BO₃

Answer 303

Na₂B₄O₇

Answer 304

Na₂HBO₃

Answer 305

First transition series

Answer 306

Third group

Answer 307

First group

Answer 308

Fifth group

Answer 309

Endothermic reaction

Answer 310

Exothermic reaction

Answer 311

Neither exothermic nor endothermic

Answer 312

None of these

Answer 313

Heat resistant

Answer 314

Green in colour

Answer 315

Used to prepare chemical garden

Answer 316

Low melting

Total Questions:	155
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Total Marks:	155
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