Chemistry S-Block Elements Online Mcqs Test

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Question 1

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

Question 2

2. Which is the formula of Chili Salt Peter?

Answer

Na₂So₄

Question 3

3. The elements having highest melting point is

Question 4

4. White lead is

Answer

Acidic lead carbonate

Answer

Basic lead hydroxide

Answer

Basic lead acetate

Answer

Basic lead carbonate

Question 5

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

Answer

Na₂B₄O₇. 10H₂O

Answer

Na₂B₄O₇.5H₂O

Answer

Na₂B₄O₇

Answer

Na₂B₃O₆. 10H₂O

Question 6

6. AlCl₃ exist as dimmer because

Answer

Incomplete p-subshell

Answer

Al has larger radius

Answer

High charge in nucleus

Answer

Al has greater ionization potential

Question 7

7. NaNO₃ decomposes on heating at high temperature to give

Question 8

8. Anodizing of Al is said when

Answer

Aluminum prepared electrolytically

Answer

Aluminum obtained at anode

Answer

Aluminum allay containing 95% Al

Answer

Aluminum coated electrically with aluminum oxide

Question 9

9. Cesium oxide will be

Answer

Amphoteric

Answer

Very strongly basic

Answer

Weakly basic

Question 10

10. Sodium metal cannot be stored under

Answer

Kerosene oil

Question 11

11. What is true about physical state of borax?

Answer

White amorphous solid

Answer

White crystalline sublime solid

Answer

None of these

Answer

White crystalline solid

Question 12

12. The formula of Nitre is

Answer

Na₂CO₃

Question 13

13. Chile Salt peter is

Answer

Na₂SO₄

Answer

Na₂S₂O₃

Question 14

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

Question 15

15. A pseudo solid is

Question 16

16. The elements which are very abundant I earth are

Question 17

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

Question 18

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

Question 19

19. Ammonia may be prepared by heating ammonium chloride with

Answer

Aqueous NaoH

Question 20

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

Question 21

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

Answer

Magnesium and sodium

Answer

Magnesium and barium

Answer

Magnesium and copper

Answer

Magnesium and potassium

Question 22

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

Answer

Na₂ CO₃

Question 23

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

Question 24

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

Question 25

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

Answer

They are more reactive

Answer

They have smaller size

Answer

They have greater atomic size

Question 26

26. Chile saltpeter has the chemical formula

Answer

Na₂CO₃. H₂O

Answer

Na₂B₄O₇

Question 27

27. Alkali metal hydroxides are stable to heat except

Question 28

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

Question 29

29. Borax is a white crystalline solid and it is

Answer

More soluble in hot water

Answer

More soluble in cold water

Answer

Insoluble in water

Answer

Soluble only in organic solvents

Question 30

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

Question 31

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

Question 32

32. The chemical composition of white lead is

Answer

Na₂CO₃

Answer

Pb(OH)₂.2PbCO₃

Question 33

33. H₃BO₃ is a

Answer

None of these

Answer

Dibasic acid

Answer

Monobasic acid

Answer

Tribasic acid

Question 34

34. Which of the most basic of the following?

Question 35

35. Alkali earth metals have two electrons outermost

Question 36

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

Answer

Molten NaCl

Question 37

37. Metallic luster exhibited by Na can be explained by

Answer

Existence of body centered cubic lattice

Answer

Oscillation of loose electrons

Answer

Excitation of free protons

Answer

Diffusion of sodium ions

Question 38

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

Question 39

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

Question 40

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

Question 41

41. The elements which belong to group IIIA are called

Answer

F – block

Answer

S – block

Answer

P – block

Answer

D – block

Question 42

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

Answer

Clay and silica

Answer

Lime stone and clay

Answer

Lime stone and gypsum

Answer

Lime stone and silica

Question 43

43. In diaphragm cell, hydrogen is discharged by

Question 44

44. Which is the chemical formula of mica?

Answer

NaAlSiO₄. 3H₂O

Answer

KH₂Al₃(SiO₄)₃

Answer

NaKSiO₄. 10H₂O

Answer

K2HAL(SiO₄)₃

Question 45

45. Washing soda has formula

Answer

Na₂CO₃.

Answer

Na₂CO₃. 7H₂O

Answer

Na₂CO₃. 10H₂O

Answer

Na₂CO₃. 3H₂O

Question 46

46. Plaster of Paris hardens by

Answer

Changing into CaCO₃

Answer

Giving out water

Answer

Giving off CO₂

Answer

Combining with water

Question 47

47. Down’s cell is used to prepare

Answer

Sodium bicarbonate

Answer

Sodium hydroxide

Answer

Sodium metal

Answer

Sodium carbonate

Question 48

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

Question 49

49. Which is formula of orthoboric acid?

Answer

H₂B₄O₇

Answer

H₆B₄O₉

Question 50

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

Question 51

51. Which is the chemical formula of zircon?

Answer

Na₃AlF₆

Answer

Al₂F₂SiO₄

Answer

H₂Mg₃(SiO₃)₄

Question 52

52. Which of the following is monovalent?

Answer

Alkali metals

Answer

Alkaline earth metals

Answer

Metalloids

Question 53

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

Question 54

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

Question 55

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

Question 56

56. The aqueous solution of potash alum is

Answer

None of these

Question 57

57. Main process for the manufacture of Na₃CO₃ is

Answer

Castner process

Answer

Solvay process

Answer

Nelson process

Answer

Down process

Question 58

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

Question 59

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

Answer

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

Answer

1s2 2s2 2p3

Answer

1s2 2s2 2p6 3s2 3p1

Answer

1s2 2s2 2p4

Question 60

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

Question 61

61. The oxides of beryllium are

Answer

None of these

Answer

Amphoteric

Question 62

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

Answer

Magnesium oxide

Answer

Nitrogen pent oxide

Answer

Zinc oxide

Answer

Aluminum oxide

Question 63

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

Answer

Barium sulphate

Answer

Zinc sulphate

Answer

Potassium sulphate

Answer

Sodium sulphate

Question 64

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

Answer

Irregular tetrahedron

Answer

Square pyramid (carbon at apex)

Answer

Square planar

Answer

None of these

Answer 110

Sodium tetra aluminate

Answer 111

Aluminum hydroxide

Answer 112

Aluminum oxide

Answer 113

Sodium meta-aluminate

Answer 114

None of these

Answer 115

It is not true

Answer 116

It is a conductor of electricity

Answer 117

It is a good reflector of radiant energy

Answer 118

It is a conductor of heat

Answer 119

Al₂O₃. 2SiO₂. 2H₂O

Answer 120

Al₂O₃. SiF₄

Answer 121

Al₂O₃. 2H₂O

Answer 122

Na₂co₃

Answer 123

Lubricants

Answer 124

Water repellent

Answer 125

Hydraulic brakes

Answer 126

Antifreeze

Answer 127

Low atomic volume

Answer 128

Low density

Answer 129

Low electro negativity

Answer 130

Low ionization energy

Answer 131

Limestone, gypsum and alumina

Answer 132

Limestone, clay and sand

Answer 133

Limestone, clay and gypsum

Answer 134

Limestone, gypsum and sand

Answer 135

Used to prepare chemical garden

Answer 136

Heat resistant

Answer 137

Green in colour

Answer 138

Low melting

Answer 139

None of these

Answer 140

Al₂O₃. 2H₂O

Answer 141

Al₂O₃. SiF₄

Answer 142

None of these

Answer 143

High nuclear charge and ionization

Answer 144

High ionization potential

Answer 145

High nuclear charge

Answer 146

Alkalinity of soil

Answer 147

Proper growth of plants

Answer 148

Soil porosity

Answer 149

Only silicates

Answer 150

Silica or siticates

Answer 151

Li, Na, Be

Answer 152

Li, Mg, Ca

Answer 153

All have same products

Answer 154

Barium sulphate

Answer 155

Zinc sulphate

Answer 156

Sodium sulphate

Answer 157

Potassium sulphate

Answer 158

Sodium aluminum hydroxide

Answer 159

Sodium meta aluminate

Answer 160

Sodium aluminum hydride

Answer 161

Aluminum peroxide

Answer 162

In drying of benzene

Answer 163

In drying of ammonia solution

Answer 164

In drying of alcohols

Answer 165

As a general drying agent

Answer 166

It has delocalized mobile electron

Answer 167

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

Answer 168

Carbon atoms have covalent bonds

Answer 169

Carbon atoms of each plane have sp²

Answer 170

Electrolytic process

Answer 171

Baeyer’s process

Answer 172

Hoop’s process

Answer 173

Serpeck’s process

Answer 174

Smaller ionic radii

Answer 175

Lower ionization energy

Answer 176

High melting point

Answer 177

Greater hardness

Answer 178

Ca₂B₆O₁₁. 5H₂O

Answer 179

NaOH. B₂O₃

Answer 180

Na₂B₄O₇. 10H₂O

Answer 181

Na₂B₄O₇. 4G₂O

Answer 182

CaCO₃.MgCO₃

Answer 183

Na₃AIF₆

Answer 184

CaCl₂.MgCl₂.6H₂O

Answer 185

KCL.MgCL₂.6H₂O

Answer 186

Na₃ALF₆

Answer 187

Al₂O₃.₂H₂O

Answer 188

Al₂O₃. H₂O

Answer 189

Neither exothermic nor endothermic

Answer 190

Endothermic reaction

Answer 191

Exothermic reaction

Answer 192

Coal is the hardest and coke is the softest

Answer 193

Graphite is the hardest which lamp black is the softest

Answer 194

Diamond is the hardest and coke is the softest

Answer 195

Diamond is the hardest and graphite is the softest

Answer 196

Chlorophyll

Answer 197

Haemoglbin

Answer 198

Oxygen forms a protective reaction easily with water

Answer 199

Iron undergoes reaction easily with water

Answer 200

It is a noble metal

Answer 201

Fe form mono and divalent ions

Answer 202

It gives hydrogen with water

Answer 203

It has only one electron in the outermost orbit

Answer 204

It is a soft alkali metal

Answer 205

It has mobile electrons

Answer 206

Acidic solution

Answer 207

Amphoteric

Answer 208

Na₂HBO₃

Answer 209

Na₃BO₃

Answer 210

Na₂B₄O₇

Answer 211

First transition series

Answer 212

Third group

Answer 213

First group

Answer 214

Fifth group

Answer 215

Caustic soda

Answer 216

Slaked lime

Answer 217

Baryata solution

Answer 218

Caustic potash

Answer 219

Contact process

Answer 220

Hall process

Answer 221

Haber process

Answer 222

Termite process

Answer 223

Na₂SiO₃ and SiO₂

Answer 224

Na₂CiO₃ and CO₂

Answer 225

Na₂O and SiO₂

Answer 226

Na₂SiO₃ and CaSiO₃

Answer 227

Li, Na, K, Rb, Cs, Fr

Answer 228

Li, Na, Cs, K, Rb, Fr

Answer 229

Na, K, Li, Rb, Fe, Cs

Answer 230

Fr, Li, Rb, K, Na, Cs

Answer 231

Carbon is non-metal while silicon is semi-metal

Answer 232

CO2 forms multiple bond while silicon does not form multiple bonds

Answer 233

CO2 is an independent molecule while SiO2 has network covalent structure

Answer 234

Silicon has all sigma bonds

Answer 235

Boric acid

Answer 236

Calcium carbonate

Answer 237

Colemanite

Answer 238

N₂ as well as CO₂

Answer 239

Sparingly soluble in cold water but readily soluble in hot water

Answer 240

Sparingly soluble in cold water at all temperatures

Answer 241

Readily soluble in cold water

Answer 242

Highly soluble in water at all temperatures.

Answer 243

Calcium carbonate

Answer 244

Calcium bicarbonate

Answer 245

Calcium hydroxide

Answer 246

Calcium oxide

Answer 247

It is more electropositive

Answer 248

It is a metal

Answer 249

It has higher atomic weight

Answer 250

It is more electronegative

Answer 251

Ca(HCO₃)₂

Answer 252

As compared to iron, aluminum has greater affinity for oxygen

Answer 253

Reaction between iron and oxygen is endothermic

Answer 254

As compared to aluminum, iron has greater affinity for oxygen

Answer 255

Refraction between aluminum and oxygen is endothermic

Answer 256

Plaster of Paris

Answer 257

Baking soda

Answer 258

Washing soda

Answer 259

Noble gases

Answer 260

Carbrandum

Answer 261

Na₂B₄O₇

Answer 262

Na₃BO₃

Answer 263

Do not show definite trend

Answer 264

Remain constant

Answer 265

As a mordant is dyeing

Answer 266

In tanning of leather

Answer 267

As an insecticide

Answer 268

In purification of water

Answer 269

On heating it melts in its water of crystallization

Answer 270

Its aqueous sol. Is basic in nature

Answer 271

Its empirical formula is KAl(SO₄). 12H₂O

Answer 272

It is used in dyeing industry

Answer 273

Could not apply

Answer 274

Hg₂Cl₂

Answer 275

Their atomic size decreases

Answer 276

The stability of +2 oxidation state increases

Answer 277

Their metallic character decreases

Answer 278

Their ionization energy increases

Answer 279

Mg(NO₃)₂

Answer 280

Be(NO₃)₂

Answer 281

Sr(NO₃)₂

Answer 282

Electropositivity

Answer 283

Atomic volume

Answer 284

Atomic radii

Answer 285

Ionic compounds

Answer 286

Molecular addition compounds

Answer 287

Semiconductors

Answer 288

Molecular crystals

Answer 289

For washing of eyes

Answer 290

In soda bottles

Answer 291

For enamels and glazes

Answer 292

An antiseptic medicine

Answer 293

None is correct

Answer 294

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

Answer 295

It reacts readily with oxygen of the air at room temperature

Answer 296

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

Answer 297

Acidic oxide

Answer 298

Basic oxide

Answer 299

Amphoteric oxide

Answer 300

It does not exists

Answer 301

To remove air bubbles from molten metal

Answer 302

As nitro meter

Answer 303

To produce alloy

Answer 304

As insulator

Answer 305

Oxidation with atmospheric oxygen

Answer 306

Combination with atmospheric CO₂

Answer 307

Dehydration

Answer 308

Hydration to yield another hydrate

Answer 309

d – only

Answer 310

f – only

Answer 311

Both d – and f –

Answer 312

s – or – p

Answer 313

Na(NH₄). H₂O

Answer 314

Na(NH₄)HPO₄.4H₂O

Answer 315

K(NH₄)HPO₃. 2H₂O

Answer 316

HPO₄.4H₂O

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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