What do you understand by an alkali. Give two examples of weak alkalis
An alkali is a basic hydroxide which when dissolved in water, produces hydroxyl ions (OH-) as the only negatively charged... View Article
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Lactose is composed of (1) Glucose + Galactose (2) Glucose + Fructose (3)Glucose + Glucose (4) Glucose + mannose
Answer: (1) Glucose + Galactose Lactose is a disaccharide that is commonly known as milk sugar. It is composed of galactose... View Article
What is the taste of baking soda
Baking soda tastes bitter.
Which gives co2 on heating slaked lime or limestone?
Limestone on heating gives calcium oxide and carbon dioxide. CaCO3—>CaO+CO2
What is solute and solvent in air
In the air, Nitrogen is the solvent (majority component), and oxygen (minority component) is the solute.
Is lime water an acidic or basic solution?
Lime water has a pH of 12.4. Hence, it is basic in nature.
Draw the structure of benzene and cyclohexane
Benzene is an organic chemical compound with the molecular formula C6H6. It is a colourless liquid with a sweet odour. The... View Article
Element showing spontaneous combustion is (a). phosphorous (p) b. calcium (ca) c. copper (cu) d. lithium (li)
Option d. lithium (li)
Which of the following gases protects us from harmful sun (a) Carbon dioxide (b) Nitrogen (c) Ozone (d) Oxygen
Option (c) Ozone.
The number of atoms in hcp unit cell is a) 4 b) 6 c) 12 d) 12
Option b) 6.
Drains get blocked by ———————-
Drains get blocked by oils, fats, chemicals and dirts.
Define calcination and roasting give one example of each
The definition and examples of calcination and roasting is: Calcination: The process in which the ore is heated to a... View Article
Common salt can be purified by a process of?
The common salt is purified by the process of crystallization.
The rate of first-order reaction is 0.04 mol/l/s at 10 sec and 0.03 mol/L/s at 20 sec after intiation of the reaction. What is the half-life period of the reaction?
The half-life period of the reaction is given as: \(\begin{array}{l}k=frac{2.303}{t_{2}-t_{1}}logfrac{[A]_{1}}{[A]_{2}}\end{array} \) \(\begin{array}{l}k=frac{2.303}{t_{2}-t_{1}}logfrac{(rate)_{1}}{(rate)_{2}}\end{array} \) This is because rate is proportional to... View Article
Which of the following fibre is not a natural fibre?
Which of the following fibre is not a natural fibre? Nylon Jute Silk Cotton The correct option is i. Nylon.
Is burning of candle a reversible or irreversible change? Is melting of wax a reversible or irreversible change?
The burning of candle is an irreversible change as the burnt candle thread cannot be obtained. While the melting of... View Article
Among the following compounds which can be dehydrated very easily a) CH3CH2CH2CH2CH2OH b) CH3CH2CH2CHOHCH3 c) CH3CH2CHCH3CH2CH2OH d) CH3CH2CH3COHCH2CH3
Option d) CH3CH2CH3COHCH2CH3. The ease of dehydration of alcohols is tertiary > secondary > primary according to the order of... View Article
What is the IUPAC name of ethylene and acetylene?
The IUPAC name of ethylene is ethene and the IUPAC name of acetylene is ethyne.
Which of the following are amphoteric oxides a) CaO b) NaoH c) BeO d)LiOH
Option c) BeO is an amphoteric oxide.
Which of the following is gem-dihalide? (a) CH₃CHBr₂ (b) BrCH₂CH₂Br (c) CH₃CHBrCH₂Br (d) CH₃CHBrCH₂CH₂CH₂Br
Option (a) CH₃CHBr₂
