311. Which among the following is false about alpha particles?

1. They have high ionizing power
2. They have high penetrating power
3. They have high kinetic energy
4. They are positively charged helium nuclei

Option “B” is correct
Alpha particles made of 2 protons and 2 neutrons and they have low penetrating power.
312. Which among the following is not a characteristic of oxidation reaction?

1. It involves addition of hydrogen
2. It involves addition of oxygen
3. It involves loss of electrons
4. It involves addition of electronegative element

Option “A” is correct
Oxidation is loss of eletrons and addition of oxygen. It also involve addition of electronegative element.
313. Ozone is represented as _____.

1. O3
2. H2O2
3. Cl2O
4. N2O

Option “A” is correct
Ozone is a gas composed of three atoms of oxygen (O3). Ozone occurs both in the Earth’s upper atmosphere and at ground level. Its presence as a layer in stratosphere serves as a screen (called ozone shield) to block harmful ultraviolet radiation from reaching the earth’s surface.
314. Which of the following is a chemical formula of quicklime?

1. Ca2O
2. Ca2CO3
3. CaO2
4. CaO

Option “D” is correct
CaO is a chemical formula of quicklime.
315. What is the name of the acid in grapes?

1. Lactic acid
2. Formic acid
3. Acetic acid
4. Tartaric acid

Option “D” is correct
The principal organic acid found in grapes is Tartaric Acids.
316. Which acid is present in lemon?

1. Formic acid
2. Citric acid
3. Lactic acid
4. Tartaric acid

Option “B” is correct
Citric Acid is mainly present in Lemon.
317. Tear gas used by the police to disperse the mob contains –

1. Carbon dioxide
2. Chlorine
3. Ammonia
4. Hydrogen sulphide

Option “B” is correct
Tear gas used by the police to disperse the mob contains Chlorine.
318. Formation of ozone hole is maximum over –

1. Africa
2. India
3. Antarctica
4. Europe

Option “C” is correct
A continent sized hole (thinning) has been formed over Antarctica as a result of damage to ozone.
319. Soda water was invented by –

1. Tivadar Puskas
2. Joseph Priestley
3. Petrache Poenaru
4. James Leonard Plimpton

Option “B” is correct
Soda water was invented by Joseph Priestley.
320. The mass of proton and mass of ________ is same.

1. Neutron
2. Electron
3. Isoprone
4. Alpha particle

Option “A” is correct
Protons and neutrons have nearly the same mass while electrons are much less massive.
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166 thoughts on “Chemistry”

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    I Love chemical…it’s my favourite subject..mere iss mein se hmesha hi boht ache marks aate hai….and my interest is also in chemistry…

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    Personally I don’t think the criticism really sticks these days. In watchmaking as in everything else people copy you can say “are link influenced by” if you want some people do and hell if we had an Infinity Gauntlet and did a Snap on every watch that is obviously influenced by the Royal Oak we’d have a lot of dust in the air.

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    Everything about the new GRNR for lack of a consensus nickname link yet is basically like every other 126710. The stainless steel case is 40mm by 12mm and the watch comes with choice of Jubilee or Oyster bracelet. The watch is powered by a caliber 3285 with 70 hours of power reserve and has the independent jumping hour hand to skip time zones when you travel from place to place.

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    Brand AutodromoModel Group B S2 Corsica BlueDiameter 39mm Case Material Titanium and steelDial Color BlueIndexes PinkLume Yes on hands and hour link markersWater Resistance 50 metersStrapBracelet Steel bracelet can be removed for the use of a traditional two-piece strap

  148. ubetoraizelb

    Skull form watches have never really made a third comeback partly because they’re impractical to carry and partly because pocket watches these days are a niche of link a niche the annual production of pocket watches from high-end makers like Patek AP and Vacheron is a drop in the ocean of wristwatches that come out of Switzerland every year. However watches with skulls on the dial or otherwise incorporated into the design of a watch are in the catalogue of several brands.

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