Purines and pyrimidines are_________________?
A. Enzymes
B. Nitrogenous bases
C. Carbohydrates
D. Lipids
Submitted by :- Jamil Ahmed
Which of the following element does not show allotropy_________________?
A. Carbon
B. Arsenic
C. Nitrogen
D. Sulphur
Submitted by :- Jamil Ahmed
Benzene is a good solvent for__________________?
A. fats
B. resins
C. iodine
D. all the above
Submitted by :- Jamil Ahmed
If a graph is plotted between temperature on x-axis and volume on y-axis for 1 mole of gas then we get straight line which cuts the temperature axis at________________?
A. 0 °C
B. 273.16K
C. -273.16 K
D. -273.15 °C or 0 Kelvin.
Submitted by :- Jamil Ahmed
When aqueous bromine is added to aqueous phenol a creamy white ppt is obtained. What does this reaction show ?
A. phenol is unsaturated
B. 2-bromophenol is insoluble in water
C. a hydroxy group makes the benzene ring more susceptible to electrophilic attack
D. acid-base reaction
Submitted by :- Jamil Ahmed
The unit of the rate constant (k) is same as that of rate of reaction________________?
A. First order reaction
B. Second order reaction
C. Zero order reaction
D. Third order reaction
Submitted by :- Jamil Ahmed
Which of the following elements react with steam to produce H2 gas?
A. Pd
B. Ni
C. Sn
D. All of the above
Submitted by :- Jamil Ahmed
Consider the following redox reaction. Zn+dil HNO3 Zn (NO3)2 + N2O + H2O The coefficient number of HNO3 in the equation is__________________?
A. 6
B. 8
C. 1
D. 4
Submitted by :- Jamil Ahmed
A solution can be both____________________?
A. dilute and concentrated
B. dilute and saturated
C. saturated and unsaturated
D. saturated and super saturated
Submitted by :- Jamil Ahmed
The unit of molality is__________________?
A. moles dm-3
B. moles kg-1
C. gram dm-3
D. none
Submitted by :- Jamil Ahmed