Mortgages not to be questioned on insolvency of mortgagors.

Notwithstanding anything contained in the provincial Insolvency Act, 1920, or any corresponding law for the time being force, a mortgage executed in favour of a bank shall not be called in question in any insolvency proceed- ings on the ground that it was not executed in good faith for valuable con- sideration or on the ground that it was executed in order to give the bank a preference over other creditors of the mortgagor.