361. Acids turn ______ litmus _______.

1. red, blue
2. green, yellow
3. blue, red
4. yellow, green

Option “3” is correct
Acid turns blue litmus paper red.
362. LPG is a mixture of _______.

1. methane and butane
2. butane and propane
3. methane and propane
4. ethane and propane

Option “2” is correct
LPG is a mixture of two flammable but nontoxic gases called propane and butane.
363. What happens when one S and one P orbital is hybridized?

1. We get three orbitals in a plane
2. We get two orbitals at 180 degrees
3. We get two mutually perpendicular orbitals
4. We get four orbitals directed tetrahedrally

Option “2” is correct
When one S and one P orbital is hybridized, we get two orbitals at 180 degrees.
364. The Chemical formula of Acetic acid is _____.

1. CH3COH
2. CH3COOH
3. CH3COCH3
4. CH2COOH

Option “2” is correct
Acetic acid, also known as ethanoic acid or methane carboxylic acid, is a colorless liquid with a strong and distinct pungent and sour smell. Its chemical formula is C2H4O2 or can be written as CH3COOH or CH3CO2H.
365. Which of the following is a characteristic of an exothermic reaction?

1. Release of heat
2. Absorption of heat
3. Doesn’t involve any change in temperature
4. None of the option is correct

Option “1” is correct
An exothermic reaction is a chemical reaction that releases energy by light or heat.
366. What is the chemical formula for Sodium Chloride (Salt)?

1. NaCl2
2. NaCl
3. Na2Cl
4. Na2C

Option “2” is correct
Chemical formula for Sodium Chloride (common salt) is NaCl.
367. Which of the following gas contributes the maximum to the phenomena of global warming?

1. Methane
2. Chlorofluorocarbon (CFC)
3. Nitrogen dioxide
4. Carbon dioxide

Option “4” is correct
Carbon di oxide contributes the maximum to the phenomena of global warming. The increase in atmospheric Carbon di oxide and other greenhouse gases has increased the amount of infrared radiation absorbed and re-emitted by these molecules in the atmosphere and thus increases temperature.
368. Which of the following is also known as Carbolic Acid?

1. Phenol
2. Hydroxide
3. Sulphuric Acid
4. Ethanol

Option “1” is correct
Phenol, also known as carbolic acid, is an aromatic organic compound with the molecular formula C6H5OH.
369. Who discovered electron?

1. E. Goldstien
2. J. J.Thomson
3. Ernest Rutherford
4. J. Chadwick

Option “2” is correct
Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray.
370. Fog, clouds, mist are examples of _______.

1. Aerosol
2. Solid sol
3. Foam
4. Gel

Option “1” is correct
An aerosol is a colloid of fine solid particles or liquid droplets, in air or another gas. Examples of natural aerosols are fog, dust, forest exudates, clouds, mist and geyser steam.
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127 thoughts on “Chemistry”

  6. Dolly

    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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