Chemistry S-Block Elements Online Mcqs Test

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Question 1

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

Answer

Hydraulic brakes

Answer

Water repellent

Answer

Antifreeze

Answer

Lubricants

Question 2

2. Sodium metal cannot be stored under

Answer

Kerosene oil

Question 3

3. Nitrates of which elements give same products

Answer

Li, Na, Be

Answer

All have same products

Answer

Li, Mg, Ca

Question 4

4. Special features of borate glass is that it is

Answer

Heat resistant

Answer

Green in colour

Answer

Used to prepare chemical garden

Answer

Low melting

Question 5

5. Aluminum oxide is

Answer

It does not exists

Answer

Amphoteric oxide

Answer

Acidic oxide

Answer

Basic oxide

Question 6

6. Setting of Plaster of Paris involves

Answer

Dehydration

Answer

Hydration to yield another hydrate

Answer

Combination with atmospheric CO₂

Answer

Oxidation with atmospheric oxygen

Question 7

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

Question 8

8. Aluminum can jam radar due to

Answer

It is a good reflector of radiant energy

Answer

It is a conductor of heat

Answer

It is not true

Answer

It is a conductor of electricity

Question 9

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

Question 10

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

Answer

Na₂B₄O₇

Answer

Na₃BO₃

Answer

Na₂HBO₃

Question 11

11. Which of the following is a Lewis acid?

Question 12

12. Point out one of the following which shows moderate electrical conductivity:

Answer

Carbrandum

Question 13

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

Answer

Be(NO₃)₂

Answer

Mg(NO₃)₂

Answer

Sr(NO₃)₂

Question 14

14. The word alkali means

Question 15

15. The order of alkali metals is

Answer

Li, Na, K, Rb, Cs, Fr

Answer

Fr, Li, Rb, K, Na, Cs

Answer

Li, Na, Cs, K, Rb, Fr

Answer

Na, K, Li, Rb, Fe, Cs

Question 16

16. Plaster of Paris hardens by

Answer

Changing into CaCO₃

Answer

Giving out water

Answer

Combining with water

Answer

Giving off CO₂

Question 17

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

Answer

Calcium carbonate

Answer

Colemanite

Answer

Boric acid

Question 18

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

Answer

Ionic compounds

Answer

Molecular addition compounds

Answer

Molecular crystals

Answer

Semiconductors

Question 19

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

Answer

Carbon is non-metal while silicon is semi-metal

Answer

Silicon has all sigma bonds

Answer

CO2 is an independent molecule while SiO2 has network covalent structure

Answer

CO2 forms multiple bond while silicon does not form multiple bonds

Question 20

20. Gypsum is applied to the soil as a source of

Answer

Could not apply

Question 21

21. Galena is an ore of

Question 22

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

Answer

Atomic radii

Answer

Electropositivity

Answer

Atomic volume

Question 23

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

Question 24

24. 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 25

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

Question 26

26. Boric acid cannot be used

Answer

In soda bottles

Answer

An antiseptic medicine

Answer

For washing of eyes

Answer

For enamels and glazes

Question 27

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

Question 28

28. The element having highest electronegativity among the following is

Question 29

29. Chile saltpeter has the chemical formula

Answer

Na₂B₄O₇

Answer

Na₂CO₃. H₂O

Question 30

30. Down’s cell is used to prepare

Answer

Sodium bicarbonate

Answer

Sodium hydroxide

Answer

Sodium metal

Answer

Sodium carbonate

Question 31

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

Question 32

32. Which of the most basic of the following?

Question 33

33. What is true about solubility of orthoboric acid?

Answer

Readily soluble in cold water

Answer

Sparingly soluble in cold water at all temperatures

Answer

Sparingly soluble in cold water but readily soluble in hot water

Answer

Highly soluble in water at all temperatures.

Question 34

34. Red lead is

Question 35

35. The elements which belong to group IIIA are called

Answer

S – block

Answer

P – block

Answer

D – block

Answer

F – block

Question 36

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

Question 37

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

Question 38

38. NaNO₃ decomposes on heating at high temperature to give

Question 39

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

Answer

To produce alloy

Answer

As nitro meter

Answer

As insulator

Answer

To remove air bubbles from molten metal

Question 40

40. Borax is a white crystalline solid and it is

Answer

Soluble only in organic solvents

Answer

More soluble in hot water

Answer

Insoluble in water

Answer

More soluble in cold water

Question 41

41. Leblanc process is employed in the manufacture of

Answer

Baking soda

Answer

Plaster of Paris

Answer

Washing soda

Question 42

42. Keeping in view the comparison of alkali metals with alkaline earth metals, the alkali metals have

Answer

High melting point

Answer

Lower ionization energy

Answer

Smaller ionic radii

Answer

Greater hardness

Question 43

43. The formula of calcium cyanamide is

Question 44

44. 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 45

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

Answer

Magnesium and potassium

Answer

Magnesium and copper

Answer

Magnesium and sodium

Answer

Magnesium and barium

Question 46

46. Which is the chemical formula of zircon?

Answer

H₂Mg₃(SiO₃)₄

Answer

Na₃AlF₆

Answer

Al₂F₂SiO₄

Question 47

47. Alkali earth metals have two electrons outermost

Question 48

48. 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 49

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

Answer

d – only

Answer

Both d – and f –

Answer

s – or – p

Answer

f – only

Question 50

50. A pseudo solid is

Question 51

51. The formula of Nitre is

Answer

Na₂CO₃

Question 52

52. Which is the weakest reducing agent?

Question 53

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

Question 54

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

Question 55

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

Answer

Aluminum oxide

Answer

Zinc oxide

Answer

Nitrogen pent oxide

Answer

Magnesium oxide

Question 56

56. Potassium is kept in

Question 57

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

Answer

None of these

Question 58

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

Question 59

59. The elements which are very abundant I earth are

Question 60

60. Washing soda has formula

Answer

Na₂CO₃.

Answer

Na₂CO₃. 7H₂O

Answer

Na₂CO₃. 3H₂O

Answer

Na₂CO₃. 10H₂O

Question 61

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

Answer

Na₂B₄O₇. 10H₂O

Answer

Na₂B₄O₇

Answer

Na₂B₄O₇.5H₂O

Answer

Na₂B₃O₆. 10H₂O

Question 62

62. Choose the correct statement

Answer

Diamond is the hardest and coke is the softest

Answer

Graphite is the hardest which lamp black is the softest

Answer

Coal is the hardest and coke is the softest

Answer

Diamond is the hardest and graphite is the softest

Question 63

63. 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 64

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

Answer

Na₂ CO₃

Answer 131

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

Answer 132

None is correct

Answer 133

It reacts readily with oxygen of the air at room temperature

Answer 134

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

Answer 135

N₂ as well as CO₂

Answer 136

Molten NaCl

Answer 137

Contact process

Answer 138

Termite process

Answer 139

Haber process

Answer 140

Hall process

Answer 141

Calcium carbonate

Answer 142

Calcium hydroxide

Answer 143

Calcium bicarbonate

Answer 144

Calcium oxide

Answer 145

Na₃ALF₆

Answer 146

Al₂O₃. H₂O

Answer 147

Al₂O₃.₂H₂O

Answer 148

1s2 2s2 2p6 3s2 3p1

Answer 149

1s2 2s2 2p4

Answer 150

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

Answer 151

1s2 2s2 2p3

Answer 152

It is more electropositive

Answer 153

It is a metal

Answer 154

It has higher atomic weight

Answer 155

It is more electronegative

Answer 156

Soil porosity

Answer 157

Alkalinity of soil

Answer 158

Proper growth of plants

Answer 159

Sodium sulphate

Answer 160

Zinc sulphate

Answer 161

Barium sulphate

Answer 162

Potassium sulphate

Answer 163

None of these

Answer 164

Monobasic acid

Answer 165

Dibasic acid

Answer 166

Tribasic acid

Answer 167

Hoop’s process

Answer 168

Baeyer’s process

Answer 169

Electrolytic process

Answer 170

Serpeck’s process

Answer 171

Low electro negativity

Answer 172

Low density

Answer 173

Low atomic volume

Answer 174

Low ionization energy

Answer 175

Remain constant

Answer 176

Do not show definite trend

Answer 177

Na₂S₂O₃

Answer 178

Na₂SO₄

Answer 179

Iron undergoes reaction easily with water

Answer 180

Fe form mono and divalent ions

Answer 181

Oxygen forms a protective reaction easily with water

Answer 182

It is a noble metal

Answer 183

Na₂SiO₃ and CaSiO₃

Answer 184

Na₂SiO₃ and SiO₂

Answer 185

Na₂O and SiO₂

Answer 186

Na₂CiO₃ and CO₂

Answer 187

They have smaller size

Answer 188

They have greater atomic size

Answer 189

They are more reactive

Answer 190

White crystalline sublime solid

Answer 191

None of these

Answer 192

White crystalline solid

Answer 193

White amorphous solid

Answer 194

Na₃AIF₆

Answer 195

CaCl₂.MgCl₂.6H₂O

Answer 196

CaCO₃.MgCO₃

Answer 197

KCL.MgCL₂.6H₂O

Answer 198

Noble gases

Answer 199

Acidic solution

Answer 200

Amphoteric

Answer 201

Hg₂Cl₂

Answer 202

None of these

Answer 203

Na₂co₃

Answer 204

Excitation of free protons

Answer 205

Oscillation of loose electrons

Answer 206

Existence of body centered cubic lattice

Answer 207

Diffusion of sodium ions

Answer 208

Ca₂B₆O₁₁. 5H₂O

Answer 209

Na₂B₄O₇. 10H₂O

Answer 210

NaOH. B₂O₃

Answer 211

Na₂B₄O₇. 4G₂O

Answer 212

HPO₄.4H₂O

Answer 213

Na(NH₄). H₂O

Answer 214

K(NH₄)HPO₃. 2H₂O

Answer 215

Na(NH₄)HPO₄.4H₂O

Answer 216

Carbon atoms have covalent bonds

Answer 217

It has delocalized mobile electron

Answer 218

Carbon atoms of each plane have sp²

Answer 219

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

Answer 220

Down process

Answer 221

Solvay process

Answer 222

Nelson process

Answer 223

Castner process

Answer 224

Basic lead carbonate

Answer 225

Basic lead acetate

Answer 226

Acidic lead carbonate

Answer 227

Basic lead hydroxide

Answer 228

It is used in dyeing industry

Answer 229

Its aqueous sol. Is basic in nature

Answer 230

Its empirical formula is KAl(SO₄). 12H₂O

Answer 231

On heating it melts in its water of crystallization

Answer 232

High nuclear charge and ionization

Answer 233

High nuclear charge

Answer 234

None of these

Answer 235

High ionization potential

Answer 236

It has mobile electrons

Answer 237

It is a soft alkali metal

Answer 238

It has only one electron in the outermost orbit

Answer 239

It gives hydrogen with water

Answer 240

Sodium meta-aluminate

Answer 241

Sodium tetra aluminate

Answer 242

Aluminum oxide

Answer 243

Aluminum hydroxide

Answer 244

Limestone, gypsum and alumina

Answer 245

Limestone, clay and sand

Answer 246

Limestone, clay and gypsum

Answer 247

Limestone, gypsum and sand

Answer 248

Amphoteric

Answer 249

None of these

Answer 250

None of these

Answer 251

Irregular tetrahedron

Answer 252

Square pyramid (carbon at apex)

Answer 253

Square planar

Answer 254

Al₂O₃. 2SiO₂. 2H₂O

Answer 255

Al₂O₃. SiF₄

Answer 256

Al₂O₃. 2H₂O

Answer 257

As an insecticide

Answer 258

In purification of water

Answer 259

As a mordant is dyeing

Answer 260

In tanning of leather

Answer 261

Al₂O₃. SiF₄

Answer 262

None of these

Answer 263

Al₂O₃. 2H₂O

Answer 264

Sodium aluminum hydroxide

Answer 265

Aluminum peroxide

Answer 266

Sodium aluminum hydride

Answer 267

Sodium meta aluminate

Answer 268

Silica or siticates

Answer 269

Only silicates

Answer 270

Al has greater ionization potential

Answer 271

High charge in nucleus

Answer 272

Al has larger radius

Answer 273

Incomplete p-subshell

Answer 274

Aqueous NaoH

Answer 275

Na₂So₄

Answer 276

Their ionization energy increases

Answer 277

Their metallic character decreases

Answer 278

Their atomic size decreases

Answer 279

The stability of +2 oxidation state increases

Answer 280

H₆B₄O₉

Answer 281

H₂B₄O₇

Answer 282

Zinc sulphate

Answer 283

Barium sulphate

Answer 284

Sodium sulphate

Answer 285

Potassium sulphate

Answer 286

Haemoglbin

Answer 287

Chlorophyll

Answer 288

Fifth group

Answer 289

First group

Answer 290

First transition series

Answer 291

Third group

Answer 292

Baryata solution

Answer 293

Slaked lime

Answer 294

Caustic potash

Answer 295

Caustic soda

Answer 296

Neither exothermic nor endothermic

Answer 297

Exothermic reaction

Answer 298

Endothermic reaction

Answer 299

NaAlSiO₄. 3H₂O

Answer 300

K2HAL(SiO₄)₃

Answer 301

KH₂Al₃(SiO₄)₃

Answer 302

NaKSiO₄. 10H₂O

Answer 303

Alkaline earth metals

Answer 304

Metalloids

Answer 305

Alkali metals

Answer 306

Aluminum prepared electrolytically

Answer 307

Aluminum allay containing 95% Al

Answer 308

Aluminum coated electrically with aluminum oxide

Answer 309

Aluminum obtained at anode

Answer 310

Pb(OH)₂.2PbCO₃

Answer 311

Na₂CO₃

Answer 312

Weakly basic

Answer 313

Very strongly basic

Answer 314

Amphoteric

Answer 315

Na₂B₄O₇

Answer 316

Na₃BO₃

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