Chemistry S-Block Elements Online Mcqs Test

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Question 1

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

Answer

Atomic radii

Answer

Electropositivity

Answer

Atomic volume

Question 2

2. Alum is not used

Answer

As an insecticide

Answer

As a mordant is dyeing

Answer

In purification of water

Answer

In tanning of leather

Question 3

3. Setting of Plaster of Paris involves

Answer

Oxidation with atmospheric oxygen

Answer

Combination with atmospheric CO₂

Answer

Dehydration

Answer

Hydration to yield another hydrate

Question 4

4. Choose the compound which decomposes on heating similar to LiNO₃

Answer

Be(NO₃)₂

Answer

Mg(NO₃)₂

Answer

Sr(NO₃)₂

Question 5

5. The halide which is not hydrolyzed is

Question 6

6. Sodium metal cannot be stored under

Answer

Kerosene oil

Question 7

7. Which is the chemical formula of mica?

Answer

NaKSiO₄. 10H₂O

Answer

KH₂Al₃(SiO₄)₃

Answer

NaAlSiO₄. 3H₂O

Answer

K2HAL(SiO₄)₃

Question 8

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

Answer

Molecular crystals

Answer

Molecular addition compounds

Answer

Semiconductors

Answer

Ionic compounds

Question 9

9. The word alkali means

Question 10

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

Question 11

11. The formula of china clay is

Answer

Al₂O₃. SiF₄

Answer

Al₂O₃. 2H₂O

Answer

Al₂O₃. 2SiO₂. 2H₂O

Question 12

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

Question 13

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

Question 14

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

Question 15

15. 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 iron, aluminum has greater affinity for oxygen

Answer

Refraction between aluminum and oxygen is endothermic

Answer

As compared to aluminum, iron has greater affinity for oxygen

Question 16

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

Question 17

17. Aluminum oxide is

Answer

Basic oxide

Answer

It does not exists

Answer

Amphoteric oxide

Answer

Acidic oxide

Question 18

18. Which of the following is most dense?

Question 19

19. The formula of Nitre is

Answer

Na₂CO₃

Question 20

20. Solid CO₂ (dry ice) has a structure just like

Answer

None of these

Question 21

21. The elements having highest melting point is

Question 22

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

Answer

Na₂B₄O₇.5H₂O

Answer

Na₂B₄O₇

Answer

Na₂B₃O₆. 10H₂O

Answer

Na₂B₄O₇. 10H₂O

Question 23

23. Which is formula of orthoboric acid?

Answer

H₂B₄O₇

Answer

H₆B₄O₉

Question 24

24. The chief are of aluminum is

Answer

Al₂O₃.₂H₂O

Answer

Na₃ALF₆

Answer

Al₂O₃. H₂O

Question 25

25. In diaphragm cell, hydrogen is discharged by

Question 26

26. Nitrates of which elements give same products

Answer

All have same products

Answer

Li, Mg, Ca

Answer

Li, Na, Be

Question 27

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

Question 28

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

Answer

It has delocalized mobile electron

Answer

Carbon atoms have covalent bonds

Answer

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

Answer

Carbon atoms of each plane have sp²

Question 29

29. Which is the chemical formula of zircon?

Answer

H₂Mg₃(SiO₃)₄

Answer

Al₂F₂SiO₄

Answer

Na₃AlF₆

Question 30

30. H₃BO₃ is a

Answer

None of these

Answer

Tribasic acid

Answer

Dibasic acid

Answer

Monobasic acid

Question 31

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

Answer

Molten NaCl

Question 32

32. Ammonia may be prepared by heating ammonium chloride with

Answer

Aqueous NaoH

Question 33

33. Dolomite has the composition

Answer

CaCl₂.MgCl₂.6H₂O

Answer

KCL.MgCL₂.6H₂O

Answer

Na₃AIF₆

Answer

CaCO₃.MgCO₃

Question 34

34. The chemical composition of white lead is

Answer

Pb(OH)₂.2PbCO₃

Answer

Na₂CO₃

Question 35

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

Answer

CO2 forms multiple bond while silicon does not form multiple bonds

Answer

Carbon is non-metal while silicon is semi-metal

Answer

CO2 is an independent molecule while SiO2 has network covalent structure

Answer

Silicon has all sigma bonds

Question 36

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

Question 37

37. Which of the following is not a use of silicon?

Answer

Hydraulic brakes

Answer

Water repellent

Answer

Lubricants

Answer

Antifreeze

Question 38

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

Answer

Noble gases

Question 39

39. 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 40

40. Metallic luster exhibited by Na can be explained by

Answer

Diffusion of sodium ions

Answer

Oscillation of loose electrons

Answer

Excitation of free protons

Answer

Existence of body centered cubic lattice

Question 41

41. Which of the most basic of the following?

Question 42

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

Question 43

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

Answer

Na₂co₃

Question 44

44. Which is the most amphoteric?

Question 45

45. Galena is an ore of

Question 46

46. 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 47

47. Mica and bauxite are ores of

Question 48

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

Answer

Calcium oxide

Answer

Calcium bicarbonate

Answer

Calcium hydroxide

Answer

Calcium carbonate

Question 49

49. Which is the weakest reducing agent?

Question 50

50. Main process for the manufacture of Na₃CO₃ is

Answer

Nelson process

Answer

Castner process

Answer

Down process

Answer

Solvay process

Question 51

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

Answer

Do not show definite trend

Answer

Remain constant

Question 52

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

Question 53

53. Washing soda has formula

Answer

Na₂CO₃. 7H₂O

Answer

Na₂CO₃. 3H₂O

Answer

Na₂CO₃.

Answer

Na₂CO₃. 10H₂O

Question 54

54. Chile Salt peter is

Answer

Na₂SO₄

Answer

Na₂S₂O₃

Question 55

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

Question 56

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

Answer

Low ionization energy

Answer

Low atomic volume

Answer

Low electro negativity

Answer

Low density

Question 57

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

Answer

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

Answer

1s2 2s2 2p4

Answer

1s2 2s2 2p6 3s2 3p1

Answer

1s2 2s2 2p3

Question 58

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

Question 59

59. Which of the following is most abundant alkali metal in combined state in nature?

Answer

f – only

Answer

Both d – and f –

Answer

d – only

Answer

s – or – p

Question 60

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

Question 61

61. Down’s cell is used to prepare

Answer

Sodium bicarbonate

Answer

Sodium hydroxide

Answer

Sodium metal

Answer

Sodium carbonate

Question 62

62. Alkali earth metals have two electrons outermost

Question 63

63. Leblanc process is employed in the manufacture of

Answer

Plaster of Paris

Answer

Washing soda

Answer

Baking soda

Question 64

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

Answer

Baeyer’s process

Answer

Electrolytic process

Answer

Serpeck’s process

Answer

Hoop’s process

Answer 129

Endothermic reaction

Answer 130

Exothermic reaction

Answer 131

Neither exothermic nor endothermic

Answer 132

Haemoglbin

Answer 133

Chlorophyll

Answer 134

Sodium meta aluminate

Answer 135

Aluminum peroxide

Answer 136

Sodium aluminum hydroxide

Answer 137

Sodium aluminum hydride

Answer 138

Alkalinity of soil

Answer 139

Proper growth of plants

Answer 140

Soil porosity

Answer 141

Alkali metals

Answer 142

Metalloids

Answer 143

Alkaline earth metals

Answer 144

Na₂So₄

Answer 145

More soluble in cold water

Answer 146

Soluble only in organic solvents

Answer 147

More soluble in hot water

Answer 148

Insoluble in water

Answer 149

Diamond is the hardest and coke is the softest

Answer 150

Graphite is the hardest which lamp black is the softest

Answer 151

Coal is the hardest and coke is the softest

Answer 152

Diamond is the hardest and graphite is the softest

Answer 153

Na₂O and SiO₂

Answer 154

Na₂SiO₃ and CaSiO₃

Answer 155

Na₂CiO₃ and CO₂

Answer 156

Na₂SiO₃ and SiO₂

Answer 157

Basic lead hydroxide

Answer 158

Basic lead carbonate

Answer 159

Basic lead acetate

Answer 160

Acidic lead carbonate

Answer 161

Oxygen forms a protective reaction easily with water

Answer 162

It is a noble metal

Answer 163

Fe form mono and divalent ions

Answer 164

Iron undergoes reaction easily with water

Answer 165

None of these

Answer 166

Ca(HCO₃)₂

Answer 167

Aluminum oxide

Answer 168

Magnesium oxide

Answer 169

Nitrogen pent oxide

Answer 170

Zinc oxide

Answer 171

Barium sulphate

Answer 172

Zinc sulphate

Answer 173

Sodium sulphate

Answer 174

Potassium sulphate

Answer 175

Carbrandum

Answer 176

Na₃BO₃

Answer 177

Na₂B₄O₇

Answer 178

It has mobile electrons

Answer 179

It is a soft alkali metal

Answer 180

It has only one electron in the outermost orbit

Answer 181

It gives hydrogen with water

Answer 182

Caustic soda

Answer 183

Caustic potash

Answer 184

Slaked lime

Answer 185

Baryata solution

Answer 186

Zinc sulphate

Answer 187

Barium sulphate

Answer 188

Potassium sulphate

Answer 189

Sodium sulphate

Answer 190

It is a conductor of heat

Answer 191

It is not true

Answer 192

It is a conductor of electricity

Answer 193

It is a good reflector of radiant energy

Answer 194

Na₂HBO₃

Answer 195

Na₃BO₃

Answer 196

Na₂B₄O₇

Answer 197

None of these

Answer 198

Al₂O₃. SiF₄

Answer 199

Al₂O₃. 2H₂O

Answer 200

Used to prepare chemical garden

Answer 201

Heat resistant

Answer 202

Green in colour

Answer 203

Low melting

Answer 204

High ionization potential

Answer 205

High nuclear charge

Answer 206

High nuclear charge and ionization

Answer 207

None of these

Answer 208

It is more electronegative

Answer 209

It is more electropositive

Answer 210

It is a metal

Answer 211

It has higher atomic weight

Answer 212

P – block

Answer 213

S – block

Answer 214

F – block

Answer 215

D – block

Answer 216

Na₂ CO₃

Answer 217

None of these

Answer 218

Amphoteric

Answer 219

Na, K, Li, Rb, Fe, Cs

Answer 220

Li, Na, K, Rb, Cs, Fr

Answer 221

Fr, Li, Rb, K, Na, Cs

Answer 222

Li, Na, Cs, K, Rb, Fr

Answer 223

Could not apply

Answer 224

Aluminum hydroxide

Answer 225

Aluminum oxide

Answer 226

Sodium tetra aluminate

Answer 227

Sodium meta-aluminate

Answer 228

Hall process

Answer 229

Termite process

Answer 230

Contact process

Answer 231

Haber process

Answer 232

On heating it melts in its water of crystallization

Answer 233

It is used in dyeing industry

Answer 234

Its empirical formula is KAl(SO₄). 12H₂O

Answer 235

Its aqueous sol. Is basic in nature

Answer 236

Silica or siticates

Answer 237

Only silicates

Answer 238

Hg₂Cl₂

Answer 239

Incomplete p-subshell

Answer 240

Al has greater ionization potential

Answer 241

High charge in nucleus

Answer 242

Al has larger radius

Answer 243

N₂ as well as CO₂

Answer 244

Na(NH₄). H₂O

Answer 245

Na(NH₄)HPO₄.4H₂O

Answer 246

HPO₄.4H₂O

Answer 247

K(NH₄)HPO₃. 2H₂O

Answer 248

Third group

Answer 249

First transition series

Answer 250

First group

Answer 251

Fifth group

Answer 252

Magnesium and potassium

Answer 253

Magnesium and copper

Answer 254

Magnesium and barium

Answer 255

Magnesium and sodium

Answer 256

In soda bottles

Answer 257

An antiseptic medicine

Answer 258

For enamels and glazes

Answer 259

For washing of eyes

Answer 260

Na₂CO₃. H₂O

Answer 261

Na₂B₄O₇

Answer 262

Giving off CO₂

Answer 263

Changing into CaCO₃

Answer 264

Combining with water

Answer 265

Giving out water

Answer 266

Amphoteric

Answer 267

Very strongly basic

Answer 268

Weakly basic

Answer 269

Clay and silica

Answer 270

Lime stone and clay

Answer 271

Lime stone and gypsum

Answer 272

Lime stone and silica

Answer 273

Amphoteric

Answer 274

Acidic solution

Answer 275

As a general drying agent

Answer 276

In drying of benzene

Answer 277

In drying of alcohols

Answer 278

In drying of ammonia solution

Answer 279

None is correct

Answer 280

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

Answer 281

It reacts readily with oxygen of the air at room temperature

Answer 282

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

Answer 283

Calcium carbonate

Answer 284

Boric acid

Answer 285

Colemanite

Answer 286

Sparingly soluble in cold water but readily soluble in hot water

Answer 287

Readily soluble in cold water

Answer 288

Highly soluble in water at all temperatures.

Answer 289

Sparingly soluble in cold water at all temperatures

Answer 290

Greater hardness

Answer 291

Lower ionization energy

Answer 292

High melting point

Answer 293

Smaller ionic radii

Answer 294

Na₂B₄O₇. 10H₂O

Answer 295

Ca₂B₆O₁₁. 5H₂O

Answer 296

Na₂B₄O₇. 4G₂O

Answer 297

NaOH. B₂O₃

Answer 298

They have smaller size

Answer 299

They are more reactive

Answer 300

They have greater atomic size

Answer 301

Aluminum coated electrically with aluminum oxide

Answer 302

Aluminum prepared electrolytically

Answer 303

Aluminum obtained at anode

Answer 304

Aluminum allay containing 95% Al

Answer 305

None of these

Answer 306

Square planar

Answer 307

Square pyramid (carbon at apex)

Answer 308

Irregular tetrahedron

Answer 309

Limestone, clay and gypsum

Answer 310

Limestone, gypsum and sand

Answer 311

Limestone, gypsum and alumina

Answer 312

Limestone, clay and sand

Answer 313

White crystalline sublime solid

Answer 314

None of these

Answer 315

White amorphous solid

Answer 316

White crystalline solid

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