Chemistry S-Block Elements Online Mcqs Test

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Question 1

1. The oxides of born and silicon are

Answer

Amphoteric

Answer

Acidic solution

Question 2

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

Answer

In drying of alcohols

Answer

In drying of ammonia solution

Answer

In drying of benzene

Answer

As a general drying agent

Question 3

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

Question 4

4. Borax is a white crystalline solid and it is

Answer

Insoluble in water

Answer

More soluble in cold water

Answer

Soluble only in organic solvents

Answer

More soluble in hot water

Question 5

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

Answer

Magnesium and copper

Answer

Magnesium and barium

Answer

Magnesium and potassium

Answer

Magnesium and sodium

Question 6

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

Answer

Atomic radii

Answer

Atomic volume

Answer

Electropositivity

Question 7

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

Question 8

8. White lead is

Answer

Basic lead carbonate

Answer

Acidic lead carbonate

Answer

Basic lead hydroxide

Answer

Basic lead acetate

Question 9

9. Microcosmic salt is

Answer

Na(NH₄)HPO₄.4H₂O

Answer

HPO₄.4H₂O

Answer

K(NH₄)HPO₃. 2H₂O

Answer

Na(NH₄). H₂O

Question 10

10. The chemical composition of white lead is

Answer

Pb(OH)₂.2PbCO₃

Answer

Na₂CO₃

Question 11

11. Which one is formula of borax?

Answer

Na₂B₄O₇. 10H₂O

Answer

Na₂B₄O₇. 4G₂O

Answer

Ca₂B₆O₁₁. 5H₂O

Answer

NaOH. B₂O₃

Question 12

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

Question 13

13. 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 14

14. Which is the weakest reducing agent?

Question 15

15. The element having highest electronegativity among the following is

Question 16

16. Chrome yellow has a formula

Question 17

17. Galena is an ore of

Question 18

18. Cesium oxide will be

Answer

Very strongly basic

Answer

Amphoteric

Answer

Weakly basic

Question 19

19. Which is the formula of Chili Salt Peter?

Answer

Na₂So₄

Question 20

20. H₃BO₃ is a

Answer

Dibasic acid

Answer

Tribasic acid

Answer

Monobasic acid

Answer

None of these

Question 21

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

Answer

Colemanite

Answer

Calcium carbonate

Answer

Boric acid

Question 22

22. The word alkali means

Question 23

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

Answer

Na₂ CO₃

Question 24

24. Which compound will show the highest lattice energy?

Question 25

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

Question 26

26. Boric acid cannot be used

Answer

For washing of eyes

Answer

In soda bottles

Answer

For enamels and glazes

Answer

An antiseptic medicine

Question 27

27. Dolomite has the composition

Answer

KCL.MgCL₂.6H₂O

Answer

Na₃AIF₆

Answer

CaCO₃.MgCO₃

Answer

CaCl₂.MgCl₂.6H₂O

Question 28

28. Ammonia may be prepared by heating ammonium chloride with

Answer

Aqueous NaoH

Question 29

29. What is true about reactivity of aluminum?

Answer

None is correct

Answer

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

Answer

It reacts readily with oxygen of the air at room temperature

Answer

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

Question 30

30. What is true about physical state of borax?

Answer

White crystalline solid

Answer

White crystalline sublime solid

Answer

None of these

Answer

White amorphous solid

Question 31

31. Aluminum oxide is

Answer

Acidic oxide

Answer

Amphoteric oxide

Answer

It does not exists

Answer

Basic oxide

Question 32

32. Sodium reacts with water more vigorously than lithium because

Answer

It is a metal

Answer

It is more electronegative

Answer

It is more electropositive

Answer

It has higher atomic weight

Question 33

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

Answer

Na₂B₄O₇. 10H₂O

Answer

Na₂B₃O₆. 10H₂O

Answer

Na₂B₄O₇.5H₂O

Answer

Na₂B₄O₇

Question 34

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

Answer

Ionic compounds

Answer

Molecular crystals

Answer

Molecular addition compounds

Answer

Semiconductors

Question 35

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

Answer

1s2 2s2 2p6 3s2 3p1

Answer

1s2 2s2 2p3

Answer

1s2 2s2 2p4

Answer

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

Question 36

36. Which is the most amphoteric?

Question 37

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

Question 38

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

Question 39

39. The formula of sodium meta borate is

Answer

Na₂B₄O₇

Answer

Na₃BO₃

Question 40

40. Which of the following is monovalent?

Answer

Alkaline earth metals

Answer

Metalloids

Answer

Alkali metals

Question 41

41. Silicon is an important constituent of

Answer

Chlorophyll

Answer

Haemoglbin

Question 42

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

Answer

It is a noble metal

Answer

Oxygen forms a protective reaction easily with water

Answer

Iron undergoes reaction easily with water

Answer

Fe form mono and divalent ions

Question 43

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

Answer

CO2 forms multiple bond while silicon does not form multiple bonds

Answer

CO2 is an independent molecule while SiO2 has network covalent structure

Answer

Carbon is non-metal while silicon is semi-metal

Answer

Silicon has all sigma bonds

Question 44

44. 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

As compared to iron, aluminum has greater affinity for oxygen

Answer

Reaction between iron and oxygen is endothermic

Answer

Refraction between aluminum and oxygen is endothermic

Question 45

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

Answer

Irregular tetrahedron

Answer

Square planar

Answer

Square pyramid (carbon at apex)

Answer

None of these

Question 46

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

Question 47

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

Answer

Nitrogen pent oxide

Answer

Zinc oxide

Answer

Magnesium oxide

Answer

Aluminum oxide

Question 48

48. Which of the following is a Lewis acid?

Question 49

49. The elements which are very abundant I earth are

Question 50

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

Question 51

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

Answer

Sodium meta aluminate

Answer

Aluminum peroxide

Answer

Sodium aluminum hydride

Answer

Sodium aluminum hydroxide

Question 52

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

Question 53

53. Which of the following properties is not true for an alkali metal?

Answer

Low electro negativity

Answer

Low ionization energy

Answer

Low density

Answer

Low atomic volume

Question 54

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

Question 55

55. 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 56

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

Answer

Lime stone and silica

Answer

Lime stone and clay

Answer

Clay and silica

Answer

Lime stone and gypsum

Question 57

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

Question 58

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

Question 59

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

Question 60

60. Potassium is kept in

Question 61

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

Question 62

62. The aqueous solution of potash alum is

Answer

None of these

Question 63

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

Answer

Calcium bicarbonate

Answer

Calcium carbonate

Answer

Calcium oxide

Answer

Calcium hydroxide

Question 64

64. Red lead is

Answer 130

They have greater atomic size

Answer 131

They are more reactive

Answer 132

They have smaller size

Answer 133

Na₂co₃

Answer 134

Al₂O₃. 2H₂O

Answer 135

Al₂O₃. SiF₄

Answer 136

Al₂O₃. 2SiO₂. 2H₂O

Answer 137

Carbrandum

Answer 138

Sodium carbonate

Answer 139

Sodium hydroxide

Answer 140

Sodium metal

Answer 141

Sodium bicarbonate

Answer 142

Baeyer’s process

Answer 143

Serpeck’s process

Answer 144

Electrolytic process

Answer 145

Hoop’s process

Answer 146

Li, Na, Cs, K, Rb, Fr

Answer 147

Na, K, Li, Rb, Fe, Cs

Answer 148

Fr, Li, Rb, K, Na, Cs

Answer 149

Li, Na, K, Rb, Cs, Fr

Answer 150

Their atomic size decreases

Answer 151

The stability of +2 oxidation state increases

Answer 152

Their ionization energy increases

Answer 153

Their metallic character decreases

Answer 154

Na₂SO₄

Answer 155

Na₂S₂O₃

Answer 156

f – only

Answer 157

s – or – p

Answer 158

d – only

Answer 159

Both d – and f –

Answer 160

Noble gases

Answer 161

Li, Na, Be

Answer 162

All have same products

Answer 163

Li, Mg, Ca

Answer 164

Hg₂Cl₂

Answer 165

Carbon atoms have covalent bonds

Answer 166

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

Answer 167

Carbon atoms of each plane have sp²

Answer 168

It has delocalized mobile electron

Answer 169

Na₂CO₃. 7H₂O

Answer 170

Na₂CO₃. 10H₂O

Answer 171

Na₂CO₃.

Answer 172

Na₂CO₃. 3H₂O

Answer 173

Baking soda

Answer 174

Plaster of Paris

Answer 175

Washing soda

Answer 176

N₂ as well as CO₂

Answer 177

Fifth group

Answer 178

First group

Answer 179

First transition series

Answer 180

Third group

Answer 181

Down process

Answer 182

Nelson process

Answer 183

Solvay process

Answer 184

Castner process

Answer 185

Silica or siticates

Answer 186

Only silicates

Answer 187

Slaked lime

Answer 188

Baryata solution

Answer 189

Caustic soda

Answer 190

Caustic potash

Answer 191

High ionization potential

Answer 192

High nuclear charge

Answer 193

None of these

Answer 194

High nuclear charge and ionization

Answer 195

Combination with atmospheric CO₂

Answer 196

Dehydration

Answer 197

Hydration to yield another hydrate

Answer 198

Oxidation with atmospheric oxygen

Answer 199

Amphoteric

Answer 200

None of these

Answer 201

Kerosene oil

Answer 202

Readily soluble in cold water

Answer 203

Sparingly soluble in cold water but readily soluble in hot water

Answer 204

Highly soluble in water at all temperatures.

Answer 205

Sparingly soluble in cold water at all temperatures

Answer 206

It is a good reflector of radiant energy

Answer 207

It is a conductor of heat

Answer 208

It is not true

Answer 209

It is a conductor of electricity

Answer 210

Aluminum hydroxide

Answer 211

Sodium tetra aluminate

Answer 212

Aluminum oxide

Answer 213

Sodium meta-aluminate

Answer 214

Giving off CO₂

Answer 215

Giving out water

Answer 216

Combining with water

Answer 217

Changing into CaCO₃

Answer 218

Na₂HBO₃

Answer 219

Na₃BO₃

Answer 220

Na₂B₄O₇

Answer 221

Na₃AlF₆

Answer 222

H₂Mg₃(SiO₃)₄

Answer 223

Al₂F₂SiO₄

Answer 224

Heat resistant

Answer 225

Green in colour

Answer 226

Low melting

Answer 227

Used to prepare chemical garden

Answer 228

Na₂CO₃

Answer 229

Hydraulic brakes

Answer 230

Antifreeze

Answer 231

Water repellent

Answer 232

Lubricants

Answer 233

Al₂O₃. 2H₂O

Answer 234

Al₂O₃. SiF₄

Answer 235

None of these

Answer 236

Zinc sulphate

Answer 237

Potassium sulphate

Answer 238

Barium sulphate

Answer 239

Sodium sulphate

Answer 240

KH₂Al₃(SiO₄)₃

Answer 241

K2HAL(SiO₄)₃

Answer 242

NaKSiO₄. 10H₂O

Answer 243

NaAlSiO₄. 3H₂O

Answer 244

None of these

Answer 245

It is used in dyeing industry

Answer 246

Its empirical formula is KAl(SO₄). 12H₂O

Answer 247

Its aqueous sol. Is basic in nature

Answer 248

On heating it melts in its water of crystallization

Answer 249

Sr(NO₃)₂

Answer 250

Be(NO₃)₂

Answer 251

Mg(NO₃)₂

Answer 252

As a mordant is dyeing

Answer 253

As an insecticide

Answer 254

In purification of water

Answer 255

In tanning of leather

Answer 256

Na₃ALF₆

Answer 257

Al₂O₃. H₂O

Answer 258

Al₂O₃.₂H₂O

Answer 259

Na₂CO₃. H₂O

Answer 260

Na₂B₄O₇

Answer 261

Limestone, clay and sand

Answer 262

Limestone, gypsum and sand

Answer 263

Limestone, clay and gypsum

Answer 264

Limestone, gypsum and alumina

Answer 265

To produce alloy

Answer 266

As insulator

Answer 267

As nitro meter

Answer 268

To remove air bubbles from molten metal

Answer 269

Contact process

Answer 270

Hall process

Answer 271

Termite process

Answer 272

Haber process

Answer 273

S – block

Answer 274

F – block

Answer 275

D – block

Answer 276

P – block

Answer 277

Endothermic reaction

Answer 278

Exothermic reaction

Answer 279

Neither exothermic nor endothermic

Answer 280

Na₂SiO₃ and CaSiO₃

Answer 281

Na₂SiO₃ and SiO₂

Answer 282

Na₂O and SiO₂

Answer 283

Na₂CiO₃ and CO₂

Answer 284

High charge in nucleus

Answer 285

Incomplete p-subshell

Answer 286

Al has larger radius

Answer 287

Al has greater ionization potential

Answer 288

Do not show definite trend

Answer 289

Remain constant

Answer 290

Diamond is the hardest and coke is the softest

Answer 291

Graphite is the hardest which lamp black is the softest

Answer 292

Diamond is the hardest and graphite is the softest

Answer 293

Coal is the hardest and coke is the softest

Answer 294

Could not apply

Answer 295

It has only one electron in the outermost orbit

Answer 296

It is a soft alkali metal

Answer 297

It has mobile electrons

Answer 298

It gives hydrogen with water

Answer 299

Soil porosity

Answer 300

Alkalinity of soil

Answer 301

Proper growth of plants

Answer 302

Molten NaCl

Answer 303

H₆B₄O₉

Answer 304

H₂B₄O₇

Answer 305

Potassium sulphate

Answer 306

Zinc sulphate

Answer 307

Barium sulphate

Answer 308

Sodium sulphate

Answer 309

Diffusion of sodium ions

Answer 310

Excitation of free protons

Answer 311

Existence of body centered cubic lattice

Answer 312

Oscillation of loose electrons

Answer 313

High melting point

Answer 314

Smaller ionic radii

Answer 315

Greater hardness

Answer 316

Lower ionization energy

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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