Chemistry S-Block Elements Online Mcqs Test

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Question 1

1. Which is the chemical formula of zircon?

Answer

Na₃AlF₆

Answer

Al₂F₂SiO₄

Answer

H₂Mg₃(SiO₃)₄

Question 2

2. Amongst the metals Be, Mg, Ca and Sr of group 2 of the periodic table, the least ionic chloride would be formed by

Question 3

3. A pseudo solid is

Question 4

4. The wire in the flash bulbs is made up of

Question 5

5. Chrome yellow has a formula

Question 6

6. Red lead is

Question 7

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

Question 8

8. Microcosmic salt is

Answer

Na(NH₄)HPO₄.4H₂O

Answer

K(NH₄)HPO₃. 2H₂O

Answer

Na(NH₄). H₂O

Answer

HPO₄.4H₂O

Question 9

9. Special features of borate glass is that it is

Answer

Used to prepare chemical garden

Answer

Heat resistant

Answer

Green in colour

Answer

Low melting

Question 10

10. Which halide has highest melting point?

Question 11

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

Answer

Na₂B₄O₇

Answer

Na₂HBO₃

Answer

Na₃BO₃

Question 12

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

Answer

Ionic compounds

Answer

Molecular addition compounds

Answer

Semiconductors

Answer

Molecular crystals

Question 13

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

Answer

Carbon atoms have covalent bonds

Answer

Carbon atoms of each plane have sp²

Answer

It has delocalized mobile electron

Answer

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

Question 14

14. H₃BO₃ is a

Answer

Monobasic acid

Answer

Dibasic acid

Answer

Tribasic acid

Answer

None of these

Question 15

15. Boric acid cannot be used

Answer

For enamels and glazes

Answer

An antiseptic medicine

Answer

In soda bottles

Answer

For washing of eyes

Question 16

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

Answer

s – or – p

Answer

Both d – and f –

Answer

f – only

Answer

d – only

Question 17

17. 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 18

18. Which is the weakest reducing agent?

Question 19

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

Question 20

20. Nitrates of which elements give same products

Answer

All have same products

Answer

Li, Mg, Ca

Answer

Li, Na, Be

Question 21

21. Which is the formula of Chili Salt Peter?

Answer

Na₂So₄

Question 22

22. Aluminum oxide is

Answer

Acidic oxide

Answer

Amphoteric oxide

Answer

Basic oxide

Answer

It does not exists

Question 23

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

Answer

They have smaller size

Answer

They have greater atomic size

Answer

They are more reactive

Question 24

24. Galena is an ore of

Question 25

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

Question 26

26. 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 27

27. Setting of Plaster of Paris involves

Answer

Dehydration

Answer

Hydration to yield another hydrate

Answer

Oxidation with atmospheric oxygen

Answer

Combination with atmospheric CO₂

Question 28

28. Alkali metal hydroxides are stable to heat except

Question 29

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

Answer

Noble gases

Question 30

30. The formula of calcium cyanamide is

Question 31

31. The elements which belong to group IIIA are called

Answer

D – block

Answer

S – block

Answer

P – block

Answer

F – block

Question 32

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

Answer

Low ionization energy

Answer

Low density

Answer

Low electro negativity

Answer

Low atomic volume

Question 33

33. Sodium reacts with water more vigorously than lithium because

Answer

It has higher atomic weight

Answer

It is a metal

Answer

It is more electronegative

Answer

It is more electropositive

Question 34

34. Cesium oxide will be

Answer

Very strongly basic

Answer

Weakly basic

Answer

Amphoteric

Question 35

35. Born is soil has been considered micronutrient for

Answer

Alkalinity of soil

Answer

Soil porosity

Answer

Proper growth of plants

Question 36

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

Question 37

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

Question 38

38. NaNO₃ decomposes on heating at high temperature to give

Question 39

39. Metallic luster exhibited by Na can be explained by

Answer

Oscillation of loose electrons

Answer

Existence of body centered cubic lattice

Answer

Excitation of free protons

Answer

Diffusion of sodium ions

Question 40

40. Aluminorthermy used for on the spot welding of large iron structure is based upon the fact that

Answer

Refraction between aluminum and oxygen is endothermic

Answer

As compared to iron, aluminum has greater affinity for oxygen

Answer

As compared to aluminum, iron has greater affinity for oxygen

Answer

Reaction between iron and oxygen is endothermic

Question 41

41. The chemical formula of bauxite is

Answer

Al₂O₃. 2H₂O

Answer

Al₂O₃. SiF₄

Answer

None of these

Question 42

42. Causticisation process is used for the preparation of

Answer

Caustic soda

Answer

Baryata solution

Answer

Slaked lime

Answer

Caustic potash

Question 43

43. 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 44

44. The oxides of born and silicon are

Answer

Amphoteric

Answer

Acidic solution

Question 45

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

Answer

Lime stone and clay

Answer

Lime stone and gypsum

Answer

Lime stone and silica

Answer

Clay and silica

Question 46

46. The halide which is not hydrolyzed is

Question 47

47. The formula of china clay is

Answer

Al₂O₃. 2H₂O

Answer

Al₂O₃. SiF₄

Answer

Al₂O₃. 2SiO₂. 2H₂O

Question 48

48. Leblanc process is employed in the manufacture of

Answer

Baking soda

Answer

Washing soda

Answer

Plaster of Paris

Question 49

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

Answer

Sr(NO₃)₂

Answer

Be(NO₃)₂

Answer

Mg(NO₃)₂

Question 50

50. Potassium is kept in

Question 51

51. The element having highest electronegativity among the following is

Question 52

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

Answer

As insulator

Answer

To produce alloy

Answer

To remove air bubbles from molten metal

Answer

As nitro meter

Question 53

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

Question 54

54. When excess of SnCl₂ is added to a solution of HgCl₂, a white precipitate turning to grey is obtained. This grey colour is due to the formation of

Answer

Hg₂Cl₂

Question 55

55. Which compound will show the highest lattice energy?

Question 56

56. Choose the correct statement

Answer

Diamond is the hardest and coke is the softest

Answer

Diamond is the hardest and graphite is the softest

Answer

Graphite is the hardest which lamp black is the softest

Answer

Coal is the hardest and coke is the softest

Question 57

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

Question 58

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

Answer

Could not apply

Question 59

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

Answer

1s2 2s2 2p6 3s2 3p1

Answer

1s2 2s2 2p4

Answer

1s2 2s2 2p3

Answer

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

Question 60

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

Question 61

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

Answer

Sodium meta aluminate

Answer

Sodium aluminum hydride

Answer

Sodium aluminum hydroxide

Answer

Aluminum peroxide

Question 62

62. Main process for the manufacture of Na₃CO₃ is

Answer

Nelson process

Answer

Down process

Answer

Solvay process

Answer

Castner process

Question 63

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

Answer

Zinc sulphate

Answer

Sodium sulphate

Answer

Barium sulphate

Answer

Potassium sulphate

Question 64

64. Which of the most basic of the following?

Answer 134

Na₂B₄O₇.5H₂O

Answer 135

Na₂B₄O₇. 10H₂O

Answer 136

Na₂B₄O₇

Answer 137

Na₂B₃O₆. 10H₂O

Answer 138

Calcium carbonate

Answer 139

Calcium oxide

Answer 140

Calcium hydroxide

Answer 141

Calcium bicarbonate

Answer 142

As a mordant is dyeing

Answer 143

In purification of water

Answer 144

As an insecticide

Answer 145

In tanning of leather

Answer 146

CO2 forms multiple bond while silicon does not form multiple bonds

Answer 147

CO2 is an independent molecule while SiO2 has network covalent structure

Answer 148

Carbon is non-metal while silicon is semi-metal

Answer 149

Silicon has all sigma bonds

Answer 150

Silica or siticates

Answer 151

Only silicates

Answer 152

Na₂CiO₃ and CO₂

Answer 153

Na₂SiO₃ and SiO₂

Answer 154

Na₂SiO₃ and CaSiO₃

Answer 155

Na₂O and SiO₂

Answer 156

Fe form mono and divalent ions

Answer 157

Oxygen forms a protective reaction easily with water

Answer 158

Iron undergoes reaction easily with water

Answer 159

It is a noble metal

Answer 160

Alkaline earth metals

Answer 161

Alkali metals

Answer 162

Metalloids

Answer 163

Aluminum oxide

Answer 164

Sodium tetra aluminate

Answer 165

Aluminum hydroxide

Answer 166

Sodium meta-aluminate

Answer 167

Do not show definite trend

Answer 168

Remain constant

Answer 169

None of these

Answer 170

Carbrandum

Answer 171

Na₂S₂O₃

Answer 172

Na₂SO₄

Answer 173

It is a good reflector of radiant energy

Answer 174

It is not true

Answer 175

It is a conductor of electricity

Answer 176

It is a conductor of heat

Answer 177

None of these

Answer 178

High nuclear charge and ionization

Answer 179

High ionization potential

Answer 180

High nuclear charge

Answer 181

Magnesium and sodium

Answer 182

Magnesium and potassium

Answer 183

Magnesium and copper

Answer 184

Magnesium and barium

Answer 185

Endothermic reaction

Answer 186

Exothermic reaction

Answer 187

Neither exothermic nor endothermic

Answer 188

In drying of ammonia solution

Answer 189

In drying of alcohols

Answer 190

In drying of benzene

Answer 191

As a general drying agent

Answer 192

None of these

Answer 193

Amphoteric

Answer 194

Aluminum obtained at anode

Answer 195

Aluminum coated electrically with aluminum oxide

Answer 196

Aluminum prepared electrolytically

Answer 197

Aluminum allay containing 95% Al

Answer 198

First group

Answer 199

First transition series

Answer 200

Third group

Answer 201

Fifth group

Answer 202

Al has greater ionization potential

Answer 203

Incomplete p-subshell

Answer 204

High charge in nucleus

Answer 205

Al has larger radius

Answer 206

N₂ as well as CO₂

Answer 207

Colemanite

Answer 208

Boric acid

Answer 209

Calcium carbonate

Answer 210

Na₂B₄O₇

Answer 211

Na₂CO₃. H₂O

Answer 212

Na, K, Li, Rb, Fe, Cs

Answer 213

Fr, Li, Rb, K, Na, Cs

Answer 214

Li, Na, K, Rb, Cs, Fr

Answer 215

Li, Na, Cs, K, Rb, Fr

Answer 216

None of these

Answer 217

Kerosene oil

Answer 218

Al₂O₃. H₂O

Answer 219

Na₃ALF₆

Answer 220

Al₂O₃.₂H₂O

Answer 221

Zinc sulphate

Answer 222

Barium sulphate

Answer 223

Potassium sulphate

Answer 224

Sodium sulphate

Answer 225

Its aqueous sol. Is basic in nature

Answer 226

On heating it melts in its water of crystallization

Answer 227

It is used in dyeing industry

Answer 228

Its empirical formula is KAl(SO₄). 12H₂O

Answer 229

None is correct

Answer 230

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

Answer 231

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

Answer 232

It reacts readily with oxygen of the air at room temperature

Answer 233

The stability of +2 oxidation state increases

Answer 234

Their ionization energy increases

Answer 235

Their metallic character decreases

Answer 236

Their atomic size decreases

Answer 237

Sodium bicarbonate

Answer 238

Sodium metal

Answer 239

Sodium carbonate

Answer 240

Sodium hydroxide

Answer 241

Limestone, gypsum and alumina

Answer 242

Limestone, clay and gypsum

Answer 243

Limestone, clay and sand

Answer 244

Limestone, gypsum and sand

Answer 245

Na₂B₄O₇

Answer 246

Na₃BO₃

Answer 247

Na₂co₃

Answer 248

Aqueous NaoH

Answer 249

Na₃AIF₆

Answer 250

KCL.MgCL₂.6H₂O

Answer 251

CaCl₂.MgCl₂.6H₂O

Answer 252

CaCO₃.MgCO₃

Answer 253

Greater hardness

Answer 254

Lower ionization energy

Answer 255

Smaller ionic radii

Answer 256

High melting point

Answer 257

H₆B₄O₉

Answer 258

H₂B₄O₇

Answer 259

NaAlSiO₄. 3H₂O

Answer 260

K2HAL(SiO₄)₃

Answer 261

KH₂Al₃(SiO₄)₃

Answer 262

NaKSiO₄. 10H₂O

Answer 263

Na₂ CO₃

Answer 264

Atomic volume

Answer 265

Atomic radii

Answer 266

Electropositivity

Answer 267

It gives hydrogen with water

Answer 268

It is a soft alkali metal

Answer 269

It has only one electron in the outermost orbit

Answer 270

It has mobile electrons

Answer 271

Water repellent

Answer 272

Antifreeze

Answer 273

Lubricants

Answer 274

Hydraulic brakes

Answer 275

Ca₂B₆O₁₁. 5H₂O

Answer 276

Na₂B₄O₇. 10H₂O

Answer 277

NaOH. B₂O₃

Answer 278

Na₂B₄O₇. 4G₂O

Answer 279

Molten NaCl

Answer 280

Basic lead carbonate

Answer 281

Basic lead hydroxide

Answer 282

Basic lead acetate

Answer 283

Acidic lead carbonate

Answer 284

Na₂CO₃

Answer 285

Na₂CO₃

Answer 286

Pb(OH)₂.2PbCO₃

Answer 287

Haemoglbin

Answer 288

Chlorophyll

Answer 289

White crystalline solid

Answer 290

White amorphous solid

Answer 291

White crystalline sublime solid

Answer 292

None of these

Answer 293

Contact process

Answer 294

Hall process

Answer 295

Haber process

Answer 296

Termite process

Answer 297

Na₂CO₃. 3H₂O

Answer 298

Na₂CO₃. 10H₂O

Answer 299

Na₂CO₃.

Answer 300

Na₂CO₃. 7H₂O

Answer 301

Square pyramid (carbon at apex)

Answer 302

None of these

Answer 303

Irregular tetrahedron

Answer 304

Square planar

Answer 305

Serpeck’s process

Answer 306

Baeyer’s process

Answer 307

Hoop’s process

Answer 308

Electrolytic process

Answer 309

More soluble in hot water

Answer 310

Soluble only in organic solvents

Answer 311

More soluble in cold water

Answer 312

Insoluble in water

Answer 313

Combining with water

Answer 314

Changing into CaCO₃

Answer 315

Giving out water

Answer 316

Giving off CO₂

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