19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Reactivity of borazole is higher than that of benzene because:
Aluminium vessels should not be washed with materials containing washing soda since :
In the structure of diborane
When strongly heated, orthoboric acid leaves a residue of:
o o Re d hot 100 C 160 C H BO X Y B O ; ¾¾¾® ¾¾¾® ¾¾¾® X and Y respectively are:
Complex formation is more likely to be possible in _____
The bonds present in borazole are:
Boron nitride can be represented by the given structure. The structure of BN is similar to
The hardest compound of boron is:
An aqueous solution of boric acid is found to be weakly acidic in nature. This acidic character arises due to the following reasons.
When excess of NaOH solution is added in potash alum, the product is:
Na B O .10H O Na B O X NaBO B O Y z D ¾¾® ¯ D + 39. (S) Borax is used as a cleansing agent because on dissolv- ing in water, it gives:
Borax bead test is responded by:
Which of the following is not true regarding the nature of halides of boron ?
Which is not the use of orthoboric acid ?
Borax is not used
In BX3, B – X distance is shorter than what is expected theoretically because (X = F, Cl, Br, I)
Which of the following is the electron deficient molecule ?
Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because:
Which of the following is not true about structure of carbon dioxide ?
Which is not a method of preparing carbon monoxide on a commercial scale ? (a) 473 1273 K (s) (g) (g) 2(g) C H O CO H - + ¾¾¾¾¾® + (b) 1273 K (s) 2(g) 2(g) (g) 2(g) 2C O 4N 2CO 4N + + ¾¾¾® + (c) (g) (s) 2(g) 2C O 2CO …
CO₂ is not a poisonous gas but there is increase in concentration of CO₂ in the atmosphere due to burning of fossil fuels and decompostion of limestone. The increase in concentration of CO₂ may lead to
The element which exists in liquid state for a wide range of temperature and can be used for measuring high temperature is
The members of group 14 form tetrahalides of the type MX4. Which of the following halides cannot be readily hydrolysed by water ?
In SiO , - the tetrahedral molecule, two oxygen atoms are shared in